How to create your own ad filters

信息

在本文中，我们解释如何编写用于 AdGuard 产品的自定义过滤规则。 To test your rules, you can download the AdGuard app

A filter is a set of filtering rules applied to specific content, such as banners or pop-ups. AdGuard has a list of standard filters created by our team. We constantly improve and update them, striving to meet the needs of most of our users.
过滤器是一组应用于特定内容（例如横幅或弹出窗口）的过滤规则。 AdGuard 有我们团队创建的标准过滤器列表。我们不断改进和更新它们，努力满足大多数用户的需求。

At the same time, AdGuard allows you to create your own custom filters using the same types of rules that we have in our filters.
同时，AdGuard 允许您使用与我们过滤器中相同类型的规则来创建自己的自定义过滤器。

To describe the syntax of our filtering rules, we use Augmented BNF for Syntax Specifications, but we do not always strictly follow this specification.
为了描述过滤规则的语法，我们使用语法规范的增强 BNF ，但我们并不总是严格遵循此规范。

信息

Originally, the AdGuard's syntax was based on the syntax of Adblock Plus rules. Later, we extended it with new types of rules for better ad filtering. Some parts of this article about the rules common both to AdGuard and ABP were taken from the Adblock Plus guide on how to write filters.
最初，AdGuard 的语法是基于 Adblock Plus 规则的语法。后来，我们用新类型的规则对其进行了扩展，以实现更好的广告过滤。本文中有关 AdGuard 和 ABP 通用规则的某些部分摘自有关如何编写过滤器的 Adblock Plus 指南。

Comments

Any line that starts with an exclamation mark is a comment. In the list of rules it is displayed in gray color. AdGuard will ignore this line, so you can write anything you want. Comments are usually placed above the rules and used to describe what a rule does.
任何以感叹号开头的行都是注释。在规则列表中，它以灰色显示。 AdGuard 将忽略这一行，因此您可以编写任何您想要的内容。注释通常放置在规则之上，用于描述规则的作用。

For example: 例如：

! This is the comment. Below this line, there is an actual filtering rule.
||example.org^

Examples 示例

Blocking by domain name

This rule blocks:

http://example.org/ad1.gif
http://subdomain.example.org/ad1.gif
https://ads.example.org:8000/

This rule does not block:
该规则不会阻止：

http://ads.example.org.us/ad1.gif
http://example.com/redirect/http://ads.example.org/

By default, such rules do not work for document requests. This means that the ||example.org^ rule will block a request made to example.org when you try to navigate to this domain from another website, but if you type example.org into the address bar and try to navigate to it, the website will open. To block the document request, you will need to use a rule with the $document modifier: ||example.org^$document.
默认情况下，此类规则不适用于文档请求。这意味着当您尝试从另一个网站导航到该域时， ||example.org^规则将阻止向example.org发出的请求，但如果您在地址栏中键入example.org并尝试导航到它，网站将打开。要阻止文档请求，您需要使用带有$document修饰符的规则： ||example.org^$document 。

Blocking exact address

This rule blocks:

http://example.org/

This rule does not block:
该规则不会阻止：

https://example.org/banner/img

Basic rule modifiers

Filtering rules support numerous modifiers that allow you to fine-tune the rule behavior. Here is an example of a rule with some simple modifiers.
过滤规则支持多种修饰符，允许您微调规则行为。下面是带有一些简单修饰符的规则示例。

Basic rule modifiers

This rule blocks:

http://example.org/script.js if this script is loaded from example.com.
http://example.org/script.js如果此脚本是从example.com加载的。

This rule does not block:
该规则不会阻止：

https://example.org/script.js if this script is loaded from example.org.
https://example.org/script.js如果此脚本是从example.org加载的。
https://example.org/banner.png because it is not a script.
https://example.org/banner.png 因为它不是脚本。

Unblocking an address

This rule unblocks:

http://example.org/banner.png even if there is a blocking rule for this address.
http://example.org/banner.png即使该地址有阻止规则。

Blocking rules with $important modifier can override exceptions.
使用$important修饰符阻止规则可以覆盖异常。

Unblocking an entire website
解锁整个网站

Unblocking an entire website

This rule unblocks

It disables all cosmetic rules on example.com.
它禁用example.com上的所有修饰规则。
It unblocks all requests sent from this website even if there is are blocking rules matching these requests.
即使存在与这些请求匹配的阻止规则，它也会取消阻止从此网站发送的所有请求。

Cosmetic rule

Cosmetic rules are based on using a special language named CSS, which every browser understands. Basically, it adds a new CSS style to the website which purpose is to hide particular elements. You can learn more about CSS in general here.
外观规则基于使用一种名为 CSS 的特殊语言，每个浏览器都能理解这种语言。基本上，它向网站添加了新的 CSS 样式，其目的是隐藏特定元素。您可以在此处了解有关 CSS 的更多一般信息。

AdGuard extends CSS and lets filters developers handle much more complicated cases. However, to use these extended rules, you need to be fluent in regular CSS.
AdGuard扩展了 CSS ，让过滤器开发人员可以处理更复杂的情况。但是，要使用这些扩展规则，您需要精通常规 CSS。

Popular CSS selectors

Name	CSS selector	Description
ID selector	`#banners`	Matches all elements with `id` attribute equal to `banners`. 匹配`id`属性等于`banners`的所有元素。
Class selector	`.banners`	Matches all elements with `class` attribute containing `banners`. 匹配`class`属性包含`banners`的所有元素。
Attribute selector	`div[class="banners"]`	Matches all `div` elements with `class` attribute exactly equal to `banners`. 匹配`class`属性完全等于`banners`的所有`div`元素。
Attribute substring selector 属性子串选择器	`div[class^="advert1"]`	Matches all `div` elements which `class` attribute starts with the `advert1` string. 匹配`class`属性以`advert1`字符串开头的所有`div`元素。
Attribute substring selector 属性子串选择器	`div[class$="banners_ads"]`	Matches all `div` elements which `class` attribute ends with the `banners_ads` string. 匹配`class`属性以`banners_ads`字符串结尾的所有`div`元素。
Attribute substring selector 属性子串选择器	`a[href^="http://example.com/"]`	Matches all links that are loaded from `http://example.com/` domain. 匹配从`http://example.com/`域加载的所有链接。
Attribute selector	`a[href="http://example.com/"]`	Matches all links to exactly the `http://example.com/` address. 将所有链接与`http://example.com/`地址完全匹配。

Restrictions and limitations
限制和限制

Trusted filters
值得信赖的过滤器

Some rules can be used only in trusted filters. This category includes:
某些规则只能在受信任的过滤器中使用。该类别包括：

filter lists created by the AdGuard team,
AdGuard 团队创建的过滤器列表，
custom filter lists installed as trusted,
自定义过滤器列表安装为trusted ，
user rules. 用户规则。

AdGuard 内容拦截器

AdGuard Content Blocker is an extension for Samsung and Yandex browsers that can be installed from Google Play. It is not to be confused with the fully functional AdGuard for Android that can only be downloaded from our website. Unfortunately, AdGuard Content Blocker capabilities are limited by what the browsers allow and they only support an old Adblock Plus filters syntax:
AdGuard Content Blocker 是 Samsung 和 Yandex 浏览器的扩展，可以从 Google Play 安装。不要将其与功能齐全的 Android 版 AdGuard 相混淆，后者只能从我们的网站下载。不幸的是，AdGuard 内容拦截器的功能受到浏览器允许的限制，并且它们仅支持旧的 Adblock Plus 过滤器语法：

Basic blocking rules with the following modifiers: $domain, $third-party, content-type modifiers.
具有以下修饰符的基本阻止规则： $domain 、 $third-party 、 content-type modifiers 。
Basic exception rules with the following modifiers: $document, $elemhide.
具有以下修饰符的基本异常规则： $document 、 $elemhide 。
Basic element hiding rules with no extended CSS support.
没有扩展 CSS 支持的基本元素隐藏规则。

Because of the limitations above AdGuard Content Blocker will not be mentioned in the compatibility notes.
由于上述限制，AdGuard Content Blocker 将不会在兼容性说明中提及。

Basic rules

The most simple rules are so-called Basic rules. They are used to block requests to specific URLs. Or to unblock it, if there is a special marker "@@" at the beginning of the rule.
最简单的规则就是所谓的基本规则。它们用于阻止对特定 URL 的请求。或者解除阻止，如果规则开头有特殊标记“@@”。
The basic principle for this type of rules is quite simple: you have to specify the address and additional parameters that limit or expand the rule scope.
此类规则的基本原理非常简单：您必须指定限制或扩展规则范围的地址和附加参数。

Sub-requests

Basic rules for blocking requests are applied only to sub-requests. That means they will not block the loading of the page unless it is explicitly specified with a $document modifier.
阻止请求的基本规则仅适用于子请求。这意味着它们不会阻止页面的加载，除非使用$document修饰符显式指定。

Response status

Browser detects a blocked request as completed with an error.
浏览器检测到已阻止的请求已完成但有错误。

Rule length

Rules shorter than 4 characters are considered incorrect and will be ignored.
少于 4 个字符的规则将被视为不正确并将被忽略。

Basic rule syntax

      rule = ["@@"] pattern [ "$" modifiers ]
modifiers = [modifier0, modifier1[, ...[, modifierN]]]

pattern — an address mask. Every request URL is collated to this mask. In the template, you can also use the special characters described below. Note that AdGuard truncates URLs to a length of 4096 characters in order to speed up matching and avoid issues with ridiculously long URLs.
pattern ——地址掩码。每个请求 URL 都会与此掩码进行比较。在模板中，您还可以使用下面描述的特殊字符。请注意，AdGuard 将 URL 截断为 4096 个字符的长度，以加快匹配速度并避免出现 URL 过长的问题。
@@ — a marker that is used in rules of exception. To turn off filtering for a request, start your rule with this marker.
@@ — 在例外规则中使用的标记。要关闭对请求的过滤，请使用此标记开始您的规则。
modifiers — parameters that "clarify" the basic rule. Some of them limit the rule scope and some can completely change they way it works.
modifiers ——“阐明”基本规则的参数。其中一些限制规则范围，一些可以完全改变规则的工作方式。

Special characters
特殊字符

* — a wildcard character. It is used to represent any set of characters. This can also be an empty string or a string of any length.
* — 通配符。它用于表示任何字符集。这也可以是空字符串或任意长度的字符串。
|| — an indication to apply the rule to the specified domain and its subdomains. With this character, you do not have to specify a particular protocol and subdomain in address mask. It means that || stands for http://*., https://*., ws://*., wss://*. at once.
|| — 将规则应用于指定域及其子域的指示。使用此字符，您不必在地址掩码中指定特定协议和子域。这意味着||代表http://*. ， https://*. ， ws://*. ， wss://*.立刻。
^ — a separator character mark. Separator character is any character, but a letter, a digit, or one of the following: _ - . %. In this example separator characters are shown in bold: http://example.com/?t=1&t2=t3. The end of the address is also accepted as separator.
^ — 分隔符标记。分隔符可以是任何字符，但字母、数字或以下字符之一： _ - . % 。在此示例中example.com分隔符以粗体显示： http: // /? t=1 & t2=t3 。地址末尾也可以作为分隔符。
| — a pointer to the beginning or the end of address. The value depends on the character placement in the mask. For example, a rule swf| corresponds to http://example.com/annoyingflash.swf , but not to http://example.com/swf/index.html. |http://example.org corresponds to http://example.org, but not to http://domain.com?url=http://example.org.
| — 指向地址开头或结尾的指针。该值取决于蒙版中的字符位置。例如，规则swf|对应于 http://example.com/annoyingflash.swf ，但不至于 http://example.com/swf/index.html 。 |http://example.org对应于http://example.org ，但不对应于 http://domain.com?url=http://example.org 。

注意

|, ||, ^ can only be used with rules that have a URL pattern. For example, ||example.com##.advert is incorrect and will be ignored by the blocker.
| , || , ^只能与具有 URL 模式的规则一起使用。例如， ||example.com##.advert不正确，将被拦截器忽略。

Visual representation

We also recommend to get acquainted with the Adblock Plus filter cheatsheet, for better understanding of how such rules should be made.
我们还建议您熟悉Adblock Plus 过滤器备忘单，以便更好地理解如何制定此类规则。

Regular expressions support
正则表达式支持

If you want even more flexibility in making rules, you can use Regular expressions instead of a default simplified mask with special characters.
如果您希望在制定规则时更加灵活，可以使用正则表达式而不是带有特殊字符的默认简化掩码。

Performance

Rules with regular expressions work more slowly, therefore it is recommended to avoid them or to limit their scope to specific domains.
使用正则表达式的规则运行速度较慢，因此建议避免使用它们或将其范围限制在特定域。

If you want a blocker to determine a regular expression, the pattern has to look like this:
如果您希望阻止程序确定正则表达式，则pattern必须如下所示：

pattern = "/" regexp "/"

For example, /banner\d+/$third-party this rule will apply the regular expression banner\d+ to all third-party requests. Exclusion rule with regular expression looks like this: @@/banner\d+/.
例如， /banner\d+/$third-party该规则将把正则表达式banner\d+应用于所有第三方请求。正则表达式的排除规则如下所示： @@/banner\d+/ 。

Compatibility

AdGuard Safari and AdGuard for iOS do not fully support regular expressions because of Content Blocking API restrictions (look for "The Regular expression format" section).
由于内容阻止 API 限制， AdGuard Safari 和 AdGuard for iOS 不完全支持正则表达式（请查找“正则表达式格式”部分）。

Wildcard support for TLD (top-level domains)
TLD（顶级域名）的通配符支持

Wildcard characters are supported for TLDs of the domains in patterns of cosmetic, HTML filtering and JavaScript rules.
域的 TLD 支持通配符，格式为修饰、 HTML 过滤和JavaScript规则。

For cosmetic rules, e.g. example.*##.banner, multiple domains are matched due to the part .*, i.e. example.com, sub.example.net, example.co.uk, etc.
对于修饰规则，例如example.*##.banner ，由于.*部分而匹配多个域，即example.com 、 sub.example.net 、 example.co.uk等。

For basic rules the described logic is applicable only for the domains specified in $domain modifier, e.g. ||*/banners/*$image,domain=example.*.
对于基本规则，所描述的逻辑仅适用于$domain修饰符中指定的域，例如 ||*/banners/*$image,domain=example.* 。

Compatibility

In AdGuard for Windows, Mac, Android, and AdGuard Browser Extension rules with wildcard .* match any public suffix (or eTLD). But for AdGuard for Safari and iOS the supported list of top-level domains is limited due to Safari limitations.
在 AdGuard for Windows、Mac、Android 和 AdGuard 浏览器扩展规则中，带有通配符.*规则与任何公共后缀（或 eTLD）匹配。但对于适用于 Safari 和 iOS 的 AdGuard，由于 Safari 的限制，支持的顶级域列表有限。

Rules with wildcard for TLD are not supported by AdGuard Content Blocker.
AdGuard 内容拦截器不支持 TLD 通配符规则。

Basic rule examples
基本规则示例

||example.com/ads/* — a simple rule, which corresponds to addresses like http://example.com/ads/banner.jpg and even http://subdomain.example.com/ads/otherbanner.jpg.
||example.com/ads/* — 一个简单的规则，对应于如下地址 http://example.com/ads/banner.jpg 甚至 http://subdomain.example.com/ads/otherbanner.jpg 。
||example.org^$third-party — this rule blocks third-party requests to example.org and its subdomains.
||example.org^$third-party — 此规则阻止第三方对example.org及其子域的请求。
@@||example.com$document — general exception rule. It completely disables filtering for example.com and all subdomains. There is a number of modifiers which can be used in exception rules. For more details, please follow the link below.
@@||example.com$document — 一般例外规则。它完全禁用对example.com和所有子域的过滤。有许多修饰符可以在异常规则中使用。欲了解更多详情，请点击以下链接。

注意

The features described in this section are intended for experienced users. They extend capabilities of "Basic rules", but in order to use them you need to have a basic understanding of the way your browser works.

You can change the behavior of a "basic rule" by using additional modifiers. Modifiers should be located in the end of the rule after a $ sign and be separated by commas.

Example:

||domain.com^$popup,third-party

Basic modifiers

The following modifiers are the most simple and frequently used. Basically, they just limit the scope of rule application.

Modifier \ Products	CoreLibs apps	AdGuard for Chromium	AdGuard for Chrome MV3	AdGuard for Firefox	AdGuard iOS版	AdGuard Safari版	AdGuard 内容拦截器
$app	✅	❌	❌	❌	❌	❌	❌
$denyallow	✅	✅	✅	✅	✅	✅	❌
$domain	✅	✅	✅ *[1]	✅	✅ *[1]	✅ *[1]	✅
$header	✅	✅ *[2]	❌	✅ *[2]	❌	❌	❌
$important	✅	✅	✅	✅	✅	✅	❌
$match-case	✅	✅	✅	✅	✅	✅	✅
$method	✅	✅	✅	✅	❌	❌	❌
$popup	✅ *[3]	✅	✅ *[3]	✅	✅ *[3]	✅ *[3]	❌
$strict-first-party	⏳	❌	❌	❌	❌	❌	❌
$strict-third-party	⏳	❌	❌	❌	❌	❌	❌
$third-party	✅	✅	✅	✅	✅	✅	✅
$to	✅	✅	✅	✅	❌	❌	❌

注意

✅ — fully supported
✅ * — supported, but reliability may vary or limitations may occur; check the modifier description for more details
⏳ — feature that is planned to be implemented but is not yet available in any product
❌ — not supported

`$app`

This modifier lets you narrow the rule coverage down to a specific application (or a list of applications). This might be not too important on Windows and Mac, but this is very important on mobile devices where some of the filtering rules must be app-specific.

Android — use the app package name, e.g. org.example.app.
Windows — use the process name, e.g. chrome.exe.
Mac — use the bundle ID or the process name, e.g. com.google.Chrome.

For Mac, you can find out the bundle ID or the process name of the app by viewing the respective request details in the Filtering log.

Examples 示例

||baddomain.com^$app=org.example.app — a rule to block requests that match the specified mask and are sent from the org.example.app Android app.
||baddomain.com^$app=org.example.app — 阻止与指定掩码匹配并从org.example.app Android 应用发送的请求的规则。
||baddomain.com^$app=org.example.app1|org.example.app2 — the same rule but it works for both org.example.app1 and org.example.app2 apps.
||baddomain.com^$app=org.example.app1|org.example.app2 — 相同的规则，但它适用于org.example.app1和org.example.app2应用程序。

If you want the rule not to be applied to certain apps, start the app name with the ~ sign.
如果您希望规则不应用于某些应用程序，请以~符号开头应用程序名称。

||baddomain.com^$app=~org.example.app — a rule to block requests that match the specified mask and are sent from any app except for the org.example.app.
||baddomain.com^$app=~org.example.app — 阻止与指定掩码匹配且从除org.example.app之外的任何应用程序发送的请求的规则。
||baddomain.com^$app=~org.example.app1|~org.example.app2 — same as above, but now two apps are excluded: org.example.app1 and org.example.app2.
||baddomain.com^$app=~org.example.app1|~org.example.app2 — 与上面相同，但现在排除了两个应用程序： org.example.app1和org.example.app2 。

Restrictions 限制

Apps in the modifier value cannot have a wildcard, e.g. $app=com.*.music. Rules with such modifier are considered invalid.
修饰符值中的应用程序不能有通配符，例如$app=com.*.music 。具有此类修饰符的规则被视为无效。

Compatibility

Only AdGuard for Windows, Mac, Android are technically capable of using rules with $app modifier.
从技术上讲，只有适用于 Windows、Mac、Android 的 AdGuard 能够使用带有$app修饰符的规则。
On Windows the process name is case-insensitive starting with AdGuard for Windows with CoreLibs v1.12 or later.
在 Windows 上，从带有CoreLibs v1.12 或更高版本的 AdGuard for Windows 开始，进程名称不区分大小写。

`$denyallow`

$denyallow modifier allows to avoid creating additional rules when it is needed to disable a certain rule for specific domains. $denyallow matches only target domains and not referrer domains.
$denyallow修饰符允许在需要禁用特定域的特定规则时避免创建额外的规则。 $denyallow仅匹配目标域而不匹配引荐来源域。

Adding this modifier to a rule is equivalent to excluding the domains by the rule's matching pattern or to adding the corresponding exclusion rules. To add multiple domains to one rule, use the | character as a separator.
向规则添加此修饰符相当于通过规则的匹配模式排除域或添加相应的排除规则。要将多个域添加到一条规则，请使用|字符作为分隔符。

Examples 示例

This rule: 这条规则：

*$script,domain=a.com|b.com,denyallow=x.com|y.com

is equivalent to this one:
相当于这个：

/^(?!.*(x.com|y.com)).*$/$script,domain=a.com|b.com

or to the combination of these three:
或这三者的组合：

*$script,domain=a.com|b.com
@@||x.com$script,domain=a.com|b.com
@@||y.com$script,domain=a.com|b.com

Restrictions 限制

The rule's matching pattern cannot target any specific domains, e.g. it cannot start with ||.
规则的匹配模式不能针对任何特定域，例如它不能以||开头。。
Domains in the modifier value cannot be negated, e.g. $denyallow=~x.com, or have a wildcard TLD, e.g. $denyallow=x.*, or be a regular expression, e.g. $denyallow=/\.(com\|org)/.
修饰符值中的域不能被否定，例如$denyallow=~x.com ，或者具有通配符 TLD，例如$denyallow=x.* ，或者是正则表达式，例如$denyallow=/\.(com\|org)/ .
$denyallow cannot be used together with $to. It can be expressed with inverted $to: $denyallow=a.com|b.com is equivalent to $to=~a.com|~b.com.
$denyallow不能与$to一起使用。它可以用倒置的$to表示： $denyallow=a.com|b.com相当于$to=~a.com|~b.com 。

The rules which violate these restrictions are considered invalid.
违反这些限制的规则被视为无效。

Compatibility

Rules with $denyallow modifier are not supported by AdGuard for iOS, Safari, and AdGuard Content Blocker.
适用于 iOS、Safari 的 AdGuard 和 AdGuard 内容拦截器不支持带有$denyallow修饰符的规则。

`$domain`

$domain limits the rule scope to requests made from the specified domains and their subdomains (as indicated by the Referer HTTP header).

Syntax

The modifier is a list of one or more expressions separated by the | symbol, each of which is matched against a domain in a particular way depending on its type (see below).

domains = ["~"] entry_0 ["|" ["~"] entry_1 ["|" ["~"]entry_2 ["|" ... ["|" ["~"]entry_N]]]]
entry_i = ( regular_domain / any_tld_domain / regexp )

regular_domain — a regular domain name (domain.com). Corresponds the specified domain and its subdomains. It is matched lexicographically.
any_tld_domain — a domain name ending with a wildcard character as a public suffix, e.g. for example.* it is co.uk in example.co.uk. Corresponds to the specified domain and its subdomains with any public suffix. It is matched lexicographically.
regexp — a regular expression, starts and ends with /. The pattern works the same way as in the basic URL rules, but the characters /, $, ,, and | must be escaped with \.

信息

Rules with $domain modifier as regular_domain are supported by all AdGuard products.

Examples

Just $domain:

||baddomain.com^$domain=example.org blocks requests that match the specified mask, and are sent from domain example.org or its subdomains.
||baddomain.com^$domain=example.org|example.com — the same rule, but it works for both example.org and example.com.

If you want the rule not to be applied to certain domains, start a domain name with ~ sign.

$domain and negation ~:

||baddomain.com^$domain=example.org blocks requests that match the specified mask and are sent from the example.org domain or its subdomains.
||baddomain.com^$domain=example.org|example.com — the same rule, but it works for both example.org and example.com.
||baddomain.com^$domain=~example.org blocks requests matching the pattern sent from any domain except example.org and its subdomains.
||baddomain.com^$domain=example.org|~foo.example.org blocks requests sent from example.org and its subdomains, except the subdomain foo.example.org.
||baddomain.com^$domain=/(^\|.+\.)example\.(com\|org)\$/ blocks requests sent from example.org and example.com domains and all their subdomains.
||baddomain.com^$domain=~a.com|~b.*|~/(^\|.+\.)c\.(com\|org)\$/ blocks requests sent from any domains, except a.com, b with any public suffix (b.com, b.co.uk, etc.), c.com, c.org, and their subdomains.

$domain modifier matching target domain:

In some cases the $domain modifier can match not only the referrer domain, but also the target domain. This happens when all the following conditions are met:

The request has the document content type
The rule pattern does not match any particular domains
The rule pattern does not contain regular expressions
The $domain modifier contains only excluded domains, e.g. $domain=~example.org|~example.com

The following predicate should be satisfied to perform a target domain matching:

1 AND ((2 AND 3) OR 4)

That is, if the modifier $domain contains only excluded domains, then the rule does not need to meet the second and third conditions to match the target domain against the modifier $domain.

If some of the conditions above are not met but the rule contains $cookie or $csp modifier, the target domain will still be matched.

If the referrer matches a rule with $domain that explicitly excludes the referrer domain, then the rule will not be applied even if the target domain also matches the rule. This affects rules with $cookie and $csp modifiers, too.

Examples

*$cookie,domain=example.org|example.com will block cookies for all requests to and from example.org and example.com.
*$document,domain=example.org|example.com will block all requests to and from example.org and example.com.

In the following examples it is implied that requests are sent from http://example.org/page (the referrer) and the target URL is http://targetdomain.com/page.

page$domain=example.org will be matched, as it matches the referrer domain.
page$domain=targetdomain.com will be matched, as it matches the target domain and satisfies all requirements mentioned above.
||*page$domain=targetdomain.com will not be matched, as the pattern ||*page may match specific domains, e.g. example.page.
||*page$domain=targetdomain.com,cookie will be matched because the rule contains $cookie modifier despite the pattern ||*page may match specific domains.
/banner\d+/$domain=targetdomain.com will not be matched as it contains a regular expression.
page$domain=targetdomain.com|~example.org will not be matched because the referrer domain is explicitly excluded.

`$domain` modifier limitations

Limitations

In AdGuard for Chrome MV3 regexp and any_tld domains are not supported.

Restrictions

Safari does not support the simultaneous use of allowed and disallowed domains, so rules like ||baddomain.com^$domain=example.org|~foo.example.org will not work in AdGuard for iOS and AdGuard for Safari.

Compatibility

Rules with regular expressions in the $domain modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.11 or later, and AdGuard Browser Extension with TSUrlFilter v3.0.0 or later.

In AdGuard for Windows, Mac and Android with CoreLibs v1.12 or later the $domain modifier can be alternatively spelled as $from.

`$header`

The $header modifier allows matching the HTTP response having a specific header with (optionally) a specific value.

Syntax

$header "=" h_name [":" h_value]
h_value = string / regexp

where:

h_name — required, an HTTP header name. It is matched case-insensitively.
h_value — optional, an HTTP header value matching expression, it may be one of the following:
- string — a sequence of characters. It is matched against the header value lexicographically;
- regexp — a regular expression, starts and ends with /. The pattern works the same way as in the basic URL rules, but the characters /, $ and , must be escaped with \.

The modifier part, ":" h_value, may be omitted. In that case, the modifier matches the header name only.

Examples

||example.com^$header=set-cookie:foo blocks requests whose responses have the Set-Cookie header with the value matching foo literally.
||example.com^$header=set-cookie blocks requests whose responses have the Set-Cookie header with any value.
@@||example.com^$header=set-cookie:/foo\, bar\$/ unblocks requests whose responses have the Set-Cookie header with value matching the foo, bar$ regular expression.
@@||example.com^$header=set-cookie unblocks requests whose responses have a Set-Cookie header with any value.

`$header` modifier limitations

Restrictions

The $header modifier can be matched only when headers are received. So if the request is blocked or redirected at an earlier stage, the modifier cannot be applied.
In Adguard Browser Extension, the $header modifier is only compatible with $csp, $removeheader, $important, and $badfilter.

Compatibility

Rules with the $header modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.11 or later, and AdGuard Browser Extension with TSUrlFilter v3.0.0 or later.

`$important`

The $important modifier applied to a rule increases its priority over rules without the identical modifier. Even over basic exception rules.

Go to rules priorities for more details.

Examples

! blocking rule will block all requests despite of the exception rule
||example.org^$important
@@||example.org^

! if the exception rule also has `$important` modifier, it will prevail and requests won't be blocked
||example.org^$important
@@||example.org^$important

`$match-case`

This modifier defines a rule which applies only to addresses that match the case. Default rules are case-insensitive.

Examples

*/BannerAd.gif$match-case — this rule will block http://example.com/BannerAd.gif, but not http://example.com/bannerad.gif.

Compatibility

Rules with the $match-case are supported by AdGuard for iOS and AdGuard for Safari with SafariConverterLib v2.0.43 or later.

All other products already support this modifier.

`$method`

This modifier limits the rule scope to requests that use the specified set of HTTP methods. Negated methods are allowed. The methods must be specified in all lowercase characters, but are matched case-insensitively. To add multiple methods to one rule, use the vertical bar | as a separator.

Examples

||evil.com^$method=get|head blocks only GET and HEAD requests to evil.com.
||evil.com^$method=~post|~put blocks any requests to evil.com except POST or PUT.
@@||evil.com$method=get unblocks only GET requests to evil.com.
@@||evil.com$method=~post unblocks any requests to evil.com except POST.

Restrictions

Rules with mixed negated and not negated values are considered invalid. So, for example, the rule ||evil.com^$method=get|~head will be ignored.

Compatibility

Rules with $method modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.12 or later, and AdGuard Browser Extension for Chrome, Firefox, and Edge with TSUrlFilter v2.1.1 or later.

AdGuard will try to close the browser tab with any address that matches a blocking rule with this modifier. Please note that not all the tabs can be closed.

Examples

||domain.com^$popup — if you try to go to http://domain.com/ from any page in the browser, a new tab in which specified site has to be opened will be closed by this rule.

`$popup` modifier limitations

Limitations

The $popup modifier works best in AdGuard Browser Extension for Chromium-based browsers and Firefox.
In AdGuard for Chrome MV3 rules with the $popup modifier would not work, so we disable converting them to declarative rules. We will try to use them only in our TSUrlFilter engine and close new tabs programmatically.
In AdGuard for iOS and AdGuard for Safari, $popup rules simply block the page right away.
In AdGuard for Windows, AdGuard for Mac, and AdGuard for Android, the $popup modifier may not detect a popup in some cases and it will not be blocked. The $popup modifier applies the document content type with a special flag which is passed to a blocking page. Blocking page itself can do some checks and close the window if it is really a popup. Otherwise, page should be loaded. It can be combined with other request type modifiers, such as $third-party, $strict-third-party, $strict-first-party, and $important.

Compatibility

Rules with the $popup modifier are not supported by AdGuard Content Blocker.

`$strict-first-party`

Works the same as the $~third-party modifier, but only treats the request as first-party if the referrer and origin have exactly the same hostname.

Examples

domain.com$strict-first-party' — this rule applies only to domain.com. For example, a request from domain.com to http://domain.com/icon.ico is a first-party request. A request from sub.domain.com to http://domain.com/icon.ico is treated as a third-party one (as opposed to the $~third-party modifier).

注意

You can use a shorter name (alias) instead of using the full modifier name: $strict1p.

Compatibility

Rules with the $strict-first-party modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.16 or later.

`$strict-third-party`

Works the same as the $third-party modifier but also treats requests from the domain to its subdomains and vice versa as third-party requests.

Examples

||domain.com^$strict-third-party — this rule applies to all domains except domain.com. An example of a third-party request: http://sub.domain.com/banner.jpg (as opposed to the $third-party modifier).

注意

You can use a shorter name (alias) instead of using the full modifier name: $strict3p.

Compatibility

Rules with the $strict-third-party modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.16 or later.

`$third-party`

A restriction on third-party and custom requests. A third-party request is a request from an external domain. For example, a request to example.org from domain.com is a third-party request.

注意

To be considered as such, a third-party request should meet one of the following conditions:

Its referrer is not a subdomain of the target domain or vice versa. For example, a request to subdomain.example.org from example.org is not a third-party request
Its Sec-Fetch-Site header is set to cross-site

Examples

$third-party:

||domain.com^$third-party — this rule applies to all domains, except domain.com and its subdomains. An example of a third-party request: http://example.org/banner.jpg.

If there is a $~third-party modifier, the rule is only applied to the requests that are not from third parties. Which means, they have to be sent from the same domain.

$~third-party:

||domain.com$~third-party — this rule is applied exclusively to domain.com. Example of a non third-party request: http://domain.com/icon.ico.

注意

You may use a shorter name (alias) instead of using the full modifier name: $3p.

`$to`

$to limits the rule scope to requests made to the specified domains and their subdomains. To add multiple domains to one rule, use the | character as a separator.

Examples

/ads$to=evil.com|evil.org blocks any request to evil.com or evil.org and their subdomains with a path matching /ads.
/ads$to=~not.evil.com|evil.com blocks any request to evil.com and its subdomains, with a path matching /ads, except requests to not.evil.com and its subdomains.
/ads$to=~good.com|~good.org blocks any request with a path matching /ads, except requests to good.com or good.org and their subdomains.

Restrictions

$denyallow cannot be used together with $to. It can be expressed with inverted $to: $denyallow=a.com|b.com is equivalent to $to=~a.com|~b.com.

Compatibility

Rules with the $to modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.12 or later, and AdGuard Browser Extension with TSUrlFilter v2.1.3 or later.

Content-type modifiers

There is a set of modifiers, which can be used to limit the rule's application area to certain type of content. These modifiers can also be combined to cover, for example, both images and scripts.

Compatibility

There is a big difference in how AdGuard determines the content type on different platforms. For AdGuard Browser Extension, content type for every request is provided by the browser.
AdGuard for Windows, Mac, and Android use the following method: first, the apps try to determine the type of the request by the Sec-Fetch-Dest request header or by the filename extension. If the request is not blocked at this stage, the type will be determined using the Content-Type header at the beginning of the server response.

Examples of content-type modifiers

||example.org^$image — corresponds to all images from example.org.
||example.org^$script,stylesheet — corresponds to all the scripts and styles from example.org.
||example.org^$~image,~script,~stylesheet — corresponds to all requests to example.org except for the images, scripts and styles.

Modifier \ Products	CoreLibs apps	AdGuard for Chromium	AdGuard for Chrome MV3	AdGuard for Firefox	AdGuard iOS版	AdGuard Safari版	AdGuard 内容拦截器
$document	✅	✅	✅	✅	✅	✅	❌
$font	✅	✅	✅	✅	✅	✅	✅
$image	✅	✅	✅	✅	✅	✅	✅
$media	✅	✅	✅	✅	✅	✅	✅
$object	✅	✅	✅	✅	✅	✅	✅
$other	✅	✅	✅	✅	✅	✅	❌
$ping	✅ *[1]	✅	✅	✅	❌	❌	✅
$script	✅	✅	✅	✅	✅	✅	✅
$stylesheet	✅	✅	✅	✅	✅	✅	✅
$subdocument	✅ *[2]	✅	✅	✅	✅	✅	❌
$websocket	✅	✅	✅	✅	✅ *[3]	✅ *[3]	❌
$xmlhttprequest	✅	✅	✅	✅	✅	✅	✅
$webrtc 🚫	❌	❌	❌	❌	❌	❌	❌
$object-subrequest 🚫	❌	❌	❌	❌	❌	❌	❌

注意

✅ — fully supported
✅ * — supported, but reliability may vary or limitations may occur; check the modifier description for more details
❌ — not supported
🚫 — removed and no longer supported

`$document`

The rule corresponds to the main frame document requests, i.e. HTML documents that are loaded in the browser tab. It does not match iframes, there is a $subdocument modifier for these.

By default, AdGuard does not block the requests that are loaded in the browser tab (e.g. "main frame bypass"). The idea is not to prevent pages from loading as the user clearly indicated that they want this page to be loaded. However, if the $document modifier is specified explicitly, AdGuard does not use that logic and prevents the page load. Instead, it responds with a "blocking page".

If this modifier is used with an exclusion rule (@@), it completely disables blocking on corresponding pages. It is equivalent to using $elemhide, $content, $urlblock, $jsinject, $extension modifiers simultaneously.

Examples

@@||example.com^$document completely disables filtering on all pages at example.com and all subdomains.
||example.com^$document blocks HTML document request to example.com with a blocking page.
||example.com^$document,redirect=noopframe redirects HTML document request to example.com to an empty html document.
||example.com^$document,removeparam=test removes test query parameter from HTML document request to example.com.
||example.com^$document,replace=/test1/test2/ replaces test1 with test2 in HTML document request to example.com.

注意

You may use a shorter name (alias) instead of using the full modifier name: $doc.

`$font`

The rule corresponds to requests for fonts, e.g. .woff filename extension.

`$image`

The rule corresponds to images requests.

`$media`

The rule corresponds to requests for media files — music and video, e.g. .mp4 files.

`$object`

The rule corresponds to browser plugins resources, e.g. Java or Flash.

`$other`

The rule applies to requests for which the type has not been determined or does not match the types listed above.

`$ping`

The rule corresponds to requests caused by either navigator.sendBeacon() or the ping attribute on links.

`$ping` modifier limitations

Limitations

AdGuard for Windows, Mac, and Android often cannot accurately detect navigator.sendBeacon(). Using $ping is not recommended in the filter lists that are supposed to be used by CoreLibs-based AdGuard products.

Compatibility

Rules with $ping modifier are not supported by AdGuard for Safari and AdGuard for iOS.

`$script`

The rule corresponds to script requests, e.g. javascript, vbscript.

`$stylesheet`

The rule corresponds to CSS files requests.

注意

You may use a shorter name (alias) instead of using the full modifier name: $css.

`$subdocument`

The rule corresponds to requests for built-in pages — HTML tags frame and iframe.

Examples

||example.com^$subdocument blocks built-in page requests (frame and iframe) to example.com and all its subdomains anywhere.
||example.com^$subdocument,domain=domain.com blocks built-in page requests (frame и iframe) to example.com (and its subdomains) from domain.com and all its subdomains.

注意

You may use a shorter name (alias) instead of using the full modifier name: $frame.

`$subdocument` modified limitations

Limitations

In AdGuard for Windows, Mac, and Android subdocuments are being detected by the Sec-Fetch-Dest header if it is present. Otherwise, some main pages may be treated as subdocuments.

Compatibility

Rules with $subdocument modifier are not supported by AdGuard Content Blocker.

`$websocket`

The rule applies only to WebSocket connections.

`$websocket` modifier limitations

Limitations

For AdGuard for Safari and AdGuard for iOS, it is supported on devices with macOS Monterey (version 12) and iOS 16 or higher respectively.

Compatibility

$websocket modifier is supported in all AdGuard products except AdGuard Content Blocker.

`$xmlhttprequest`

The rule applies only to ajax requests (requests sent via javascript object XMLHttpRequest).

注意

You may use a shorter name (alias) instead of using the full modifier name: $xhr.

Compatibility

AdGuard for Windows, Mac, Android when filtering older browsers cannot accurately detect this type and sometimes detects it as $other or $script. They can only reliably detect this content type when filtering modern browsers that support Fetch metadata request headers.

`$object-subrequest` (removed)

Removal notice

$object-subrequest modifier is removed and is no longer supported. Rules with it are considered as invalid. The rule corresponds to requests by browser plugins (it is usually Flash).

`$webrtc` (removed)

Removal notice

This modifier is removed and is no longer supported. Rules with it are considered as invalid. If you need to suppress WebRTC, consider using the nowebrtc scriptlet.

The rule applies only to WebRTC connections.

Examples

||example.com^$webrtc,domain=example.org blocks webRTC connections to example.com from example.org.
@@*$webrtc,domain=example.org disables the RTC wrapper for example.org.

Exception rules modifiers

Exception rules disable the other basic rules for the addresses to which they correspond. They begin with a @@ mark. All the basic modifiers listed above can be applied to them and they also have a few special modifiers.

Visual representation

We recommend to get acquainted with the Adblock Plus filter cheatsheet, for better understanding of how exception rules should be made.

Modifier \ Products	CoreLibs apps	AdGuard for Chromium	AdGuard for Chrome MV3	AdGuard for Firefox	AdGuard iOS版	AdGuard Safari版	AdGuard 内容拦截器
$content	✅	❌	❌	✅	❌	❌	❌
$elemhide	✅	✅	✅	✅	✅	✅	✅
$extension	✅	❌	❌	❌	❌	❌	❌
$jsinject	✅	✅	✅ *[1]	✅	✅	✅	❌
$stealth	✅	✅	❌	✅	❌	❌	❌
$urlblock	✅	✅	❌	✅	✅ *[2]	✅ *[2]	❌
$genericblock	✅	✅	✅	✅	✅ *[3]	✅ *[3]	❌
$generichide	✅	✅	✅	✅	✅	✅	✅
$specifichide	✅	✅	✅	✅	❌	❌	❌

注意

✅ — fully supported
✅ * — supported, but reliability may vary or limitations may occur; check the modifier description for more details
❌ — not supported

`$content`

Disables HTML filtering, $hls, $replace, and $jsonprune rules on the pages that match the rule.

Examples

@@||example.com^$content disables all content modifying rules on pages at example.com and all its subdomains.

`$elemhide`

Disables any cosmetic rules on the pages matching the rule.

Examples

@@||example.com^$elemhide disables all cosmetic rules on pages at example.com and all subdomains.

注意

You may use a shorter name (alias) instead of using the full modifier name: $ehide.

`$extension`

Disables specific userscripts or all userscripts for a given domain.

Syntax

$extension[="userscript_name1"[|"userscript_name2"[|"userscript_name3"[...]]]]

userscript_name(i) stands for a specific userscript name to be disabled by the modifier. The modifier can contain any number of userscript names or none. In the latter case the modifier disables all the userscripts.

Userscript names usually contain spaces or other special characters, which is why you should enclose the name in quotes. Both single (') and double (") ASCII quotes are supported. Multiple userscript names should be separated with a pipe (|). However, if a userscript name is a single word without any special characters, it can be used without quotes.

You can also exclude a userscript by adding a ~ character before it. In this case, the userscript will not be disabled by the modifier.

$extension=~"userscript name"

注意

When excluding a userscript, you must place ~ outside the quotes.

If a userscript's name includes quotes ("), commas (,), or pipes (|), they must be escaped with a backslash (\).

$extension="userscript name\, with \"quote\""

Examples

@@||example.com^$extension="AdGuard Assistant" disables the AdGuard Assistant userscript on example.com website.
@@||example.com^$extension=MyUserscript disables the MyUserscript userscript on example.com website.
@@||example.com^$extension='AdGuard Assistant'|'AdGuard Popup Blocker' disables both AdGuard Assistant and AdGuard Popup Blocker userscripts on example.com website.
@@||example.com^$extension=~"AdGuard Assistant" disables all user scripts on example.com website, except AdGuard Assistant.
@@||example.com^$extension=~"AdGuard Assistant"|~"AdGuard Popup Blocker" disables all user scripts on example.com website, except AdGuard Assistant and AdGuard Popup Blocker.
@@||example.com^$extension no userscript will work on webpages on example.com.
@@||example.com^$extension="AdGuard \"Assistant\"" disables the AdGuard "Assistant" userscript on example.com website.

Compatibility

Only AdGuard for Windows, Mac, Android are technically capable of using rules with $extension modifier.
Rules with $extension modifier with specific userscript name are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.13 or later.

`$jsinject`

Forbids adding of JavaScript code to the page. You can read about scriptlets and javascript rules further.

Examples

@@||example.com^$jsinject disables javascript on pages at example.com and all subdomains.

`$jsinject` modifier limitations

Limitations

Rules with the $jsinject modifier cannot be converted to DNR in AdGuard for Chrome MV3. We only use them in the TSUrlFilter engine to disable some cosmetic rules.

Compatibility

The $jsinject modifier is not supported by AdGuard for Chrome MV3 (yet) and AdGuard Content Blocker.

`$stealth`

Disables the Tracking protection (formerly Stealth Mode) module for all corresponding pages and requests.

Syntax

$stealth [= opt1 [| opt2 [| opt3 [...]]]]

opt(i) stand for certain Tracking protection options disabled by the modifier. The modifier can contain any number of specific options (see below) or none. In the latter case the modifier disables all the Tracking protection features.

The list of the available modifier options:

searchqueries disables Hide your search queries option
donottrack disables Ask websites not to track you option
3p-cookie disables Self-destructing third-party cookies option
1p-cookie disables Self-destructing first-party cookies option
3p-cache disables Disable cache for third-party requests option
3p-auth disables Block third-party Authorization header option
webrtc disables Block WebRTC option
push disables Block Push API option
location disables Block Location API option
flash disables Block Flash option
java disables Block Java option
referrer disables Hide Referer from third parties option
useragent disables Hide your User-Agent option
ip disables Hide your IP address option
xclientdata disables Remove X-Client-Data header from HTTP requests option
dpi disables Protect from DPI option

Examples

@@||example.com^$stealth disables Tracking protection for example.com (and subdomains) requests, except for blocking cookies and hiding tracking parameters (see below).
@@||domain.com^$script,stealth,domain=example.com disables Tracking protection only for script requests to domain.com (and its subdomains) on example.com and all its subdomains.
@@||example.com^$stealth=3p-cookie|dpi disables blocking third-party cookies and DPI fooling measures for example.com.

注意

Blocking cookies and removing tracking parameters is achieved by using rules with the $cookie, $urltransform and $removeparam modifiers. Exception rules that contain only the $stealth modifier will not do these things. If you want to completely disable all Tracking protection features for a given domain, you must include all three modifiers: @@||example.org^$stealth,removeparam,cookie.

Restrictions

Modifier options must be lowercase, i.e. $stealth=DPI will be rejected.
Modifier options cannot be negated, i.e. $stealth=~3p-cookie will be rejected.
AdGuard Browser Extension supports only searchqueries, donottrack, referrer, xclientdata, 1p-cookie and 3p-cookie options.

Compatibility

Tracking protection (formerly Stealth Mode) is available in AdGuard for Windows, AdGuard for Mac, AdGuard for Android, and AdGuard Browser Extension for Firefox and Chromium-based browsers, except AdGuard for Chrome MV3. All other products will ignore the rules with $stealth modifier.
Rules with $stealth modifier with specific options are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.10 or later, and AdGuard Browser Extension with TSUrlFilter v3.0.0 or later.

`$urlblock`

Disables blocking of all requests sent from the pages matching the rule and disables all $cookie rules.

Examples

@@||example.com^$urlblock — any requests sent from the pages at example.com and all subdomains are not going to be blocked.

`$urlblock` modifier limitations

Limitations

In AdGuard for iOS and AdGuard for Safari, rules with $urlblock work as $document exclusion — unblock everything.

Compatibility

Rules with $urlblock modifier are not supported by AdGuard Content Blocker, and AdGuard for Chrome MV3.

Generic rules

Before we can proceed to the next modifiers, we have to make a definition of generic rules. The rule is generic if it is not limited to specific domains. Wildcard character * is supported as well.

For example, these rules are generic:

###banner
*###banner
#@#.adsblock
*#@#.adsblock
~domain.com###banner
||domain.com^
||domain.com^$domain=~example.com

And these are not:

domain.com###banner
||domain.com^$domain=example.com

`$genericblock`

Disables generic basic rules on pages that correspond to exception rule.

Examples

@@||example.com^$genericblock disables generic basic rules on any pages at example.com and all subdomains.

`$genericblock` modifier limitations

Limitations

In AdGuard for iOS and AdGuard for Safari, rules with $genericblock work as $document exclusion — unblock everything.

Compatibility

Rules with $genericblock modifier are not supported by AdGuard Content Blocker, and AdGuard for Chrome MV3.

`$generichide`

Disables all generic cosmetic rules on pages that correspond to the exception rule.

Examples

@@||example.com^$generichide disables generic cosmetic rules on any pages at example.com and its subdomains.

注意

You may use a shorter name (alias) instead of using the full modifier name: $ghide.

`specifichide`

Disables all specific element hiding and CSS rules, but not general ones. Has an opposite effect to $generichide.

Examples

@@||example.org^$specifichide disables example.org##.banner but not ##.banner.

注意

You may use a shorter name (alias) instead of using the full modifier name: $shide.

注意

All cosmetic rules — not just specific ones — can be disabled by $elemhide modifier.

Compatibility

Rules with $specifichide modifier are not supported by AdGuard for iOS, AdGuard for Safari, and AdGuard Content Blocker.

Advanced capabilities

These modifiers are able to completely change the behavior of basic rules.

Modifier \ Products	CoreLibs apps	AdGuard for Chromium	AdGuard for Chrome MV3	AdGuard for Firefox	AdGuard iOS版	AdGuard Safari版	AdGuard 内容拦截器
$all	✅	✅	✅ *[1]	✅	✅	✅	❌
$badfilter	✅	✅	✅ *[2]	✅	✅	✅	❌
$cookie	✅	✅	✅ *[3]	✅	❌	❌	❌
$csp	✅	✅	✅	✅	❌	❌	❌
$hls	✅	❌	❌	❌	❌	❌	❌
$inline-font	✅	✅	✅	✅	❌	❌	❌
$inline-script	✅	✅	✅	✅	❌	❌	❌
$jsonprune	✅	❌	❌	❌	❌	❌	❌
$xmlprune	✅	❌	❌	❌	❌	❌	❌
$network	✅	❌	❌	❌	❌	❌	❌
$permissions	✅ *[4]	✅	✅	✅ *[4]	❌	❌	❌
$redirect	✅	✅	✅ *[5]	✅	❌	❌	❌
$redirect-rule	✅	✅	❌	✅	❌	❌	❌
$referrerpolicy	✅	❌	⏳	❌	❌	❌	❌
$removeheader	✅	✅	❌	✅	❌	❌	❌
$removeparam	✅	✅	✅ *[6]	✅	❌	❌	❌
$replace	✅	❌	❌	✅	❌	❌	❌
$urltransform	✅	❌	❌	❌	❌	❌	❌
noop	✅	✅	✅	✅	✅	✅	❌
$empty 👎	✅	✅	✅	✅	❌	❌	❌
$mp4 👎	✅	✅	✅	✅	❌	❌	❌

注意

✅ — fully supported
✅ * — supported, but reliability may vary or limitations may occur; check the modifier description for more details
⏳ — feature that is planned to be implemented but is not yet available in any product
❌ — not supported
👎 — deprecated; still supported but will be removed in the future

`$all`

$all modifier is made of all content-types modifiers and $popup. E.g. rule ||example.org^$all is converting into rule:

||example.org^$document,subdocument,font,image,media,object,other,ping,script,stylesheet,websocket,xmlhttprequest,popup

Restrictions

This modifier cannot be used as an exception with the @@ mark.

`$all` modifier limitations

Limitations

Since $popup is a part if $all, the $all modifier is not supported by AdGuard for Chrome MV3 because of $popup modifier limitations.

Compatibility

Rules with $all modifier are not supported by AdGuard Content Blocker.

`$badfilter`

The rules with the $badfilter modifier disable other basic rules to which they refer. It means that the text of the disabled rule should match the text of the $badfilter rule (without the $badfilter modifier).

Examples

||example.com$badfilter disables ||example.com
||example.com$image,badfilter disables ||example.com$image
@@||example.com$badfilter disables @@||example.com
||example.com$domain=domain.com,badfilter disables ||example.com$domain=domain.com

Rules with $badfilter modifier can disable other basic rules for specific domains if they fulfill the following conditions:

The rule has a $domain modifier
The rule does not have a negated domain ~ in $domain modifier value

In that case, the $badfilter rule will disable the corresponding rule for domains specified in both the $badfilter and basic rules. Please note that wildcard-TLD logic works here as well.

Examples

/some$domain=example.com|example.org|example.io is disabled for example.com by /some$domain=example.com,badfilter
/some$domain=example.com|example.org|example.io is disabled for example.com and example.org by /some$domain=example.com|example.org,badfilter
/some$domain=example.com|example.org and /some$domain=example.io are disabled completely by /some$domain=example.com|example.org|example.io,badfilter
/some$domain=example.com|example.org|example.io is disabled completely by /some$domain=example.*,badfilter
/some$domain=example.* is disabled for example.com and example.org by /some$domain=example.com|example.org,badfilter
/some$domain=example.com|example.org|example.io is NOT disabled for example.com by /some$domain=example.com|~example.org,badfilter because the value of $domain modifier contains a negated domain

`$badfilter` modifier limitations

Limitations

In AdGuard for Chrome MV3 a rule with the $badfilter modifier is applied in DNR only if it fully cancels the source rule. We cannot calculate it if it is only partially canceled. Examples

Compatibility

Rules with $badfilter modifier are not supported by AdGuard Content Blocker.

The $cookie modifier completely changes rule behavior. Instead of blocking a request, this modifier makes AdGuard suppress or modify the Cookie and Set-Cookie headers.

Multiple rules matching a single request

In case if multiple $cookie rules match a single request, we will apply each of them one by one.

Syntax

$cookie [= name[; maxAge = seconds [; sameSite = strategy ]]]

where:

name — optional, string or regular expression to match cookie name.
seconds — number of seconds for current time to offset the expiration date of cookie.
strategy — string for Same-Site strategy to be applied to the cookie.

For example,

||example.org^$cookie=NAME;maxAge=3600;sameSite=lax

every time AdGuard encounters a cookie called NAME in a request to example.org, it will do the following:

Set its expiration date to current time plus 3600 seconds
Makes the cookie use Same-Site "lax" strategy.

Escaping special characters

If regular expression name is used for matching, two characters must be escaped: comma , and dollar sign $. Use backslash \ to escape each of them. For example, escaped comma looks like this: \,.

Examples

||example.org^$cookie blocks all cookies set by example.org; this is an equivalent to setting maxAge=0
$cookie=__cfduid blocks CloudFlare cookie everywhere
$cookie=/__utm[a-z]/ blocks Google Analytics cookies everywhere
||facebook.com^$third-party,cookie=c_user prevents Facebook from tracking you even if you are logged in
||facebook.com^$third-party,cookie=c_user 即使您已登录，也会阻止 Facebook 跟踪您

There are two methods to deactivate $cookie rules: the primary method involves using an exception marked with @@ — @@||example.org^$cookie. The alternative method employs a $urlblock exception (also included under the $document exception alias — $elemhide,jsinject,content,urlblock,extension). Here's how it works:
有两种方法可以停用$cookie规则：主要方法涉及使用标有@@异常 — @@||example.org^$cookie 。另一种方法采用$urlblock异常（也包含在$document异常别名下 - $elemhide,jsinject,content,urlblock,extension ）。它的工作原理如下：

@@||example.org^$cookie unblocks all cookies set by example.org
@@||example.org^$cookie取消阻止example.org设置的所有 cookie
@@||example.org^$urlblock unblocks all cookies set by example.org and disables blocking of all requests sent from example.org
@@||example.org^$urlblock取消阻止example.org设置的所有 cookie 并禁用阻止阻止从example.org发送的所有请求
@@||example.org^$cookie=concept unblocks a single cookie named concept
@@||example.org^$cookie=concept 解锁单个名为concept的cookie
@@||example.org^$cookie=/^_ga_/ unblocks every cookie that matches the regular expression
@@||example.org^$cookie=/^_ga_/ 解除阻止与正则表达式匹配的每个 cookie

`$cookie` modifier limitations

Limitations

In AdGuard for Chrome MV3 we delete cookies in 2 ways: from content-script side (to which we have access) and from onBeforeSendHeaders listener. Since onBeforeSendHeaders and other listeners are no longer blocking, we are not able to delete them in all cases. You can check if a rule works with this test.
在AdGuard for Chrome MV3中，我们通过两种方式删除 cookie：从content-script端（我们有权访问）和从onBeforeSendHeaders侦听器。由于onBeforeSendHeaders和其他侦听器不再阻塞，因此我们无法在所有情况下删除它们。您可以检查规则是否适用于此测试。

Restrictions 限制

$cookie rules support these types of modifiers: $domain, $~domain, $important, $third-party, $~third-party, strict-third-party, and strict-first-party.
$cookie规则支持以下类型的修饰符： $domain 、 $~domain 、 $important 、 $third-party 、 $~third-party 、 strict-third-party和strict-first-party 。

Compatibility

Rules with $cookie modifier are not supported by AdGuard Content Blocker, AdGuard for iOS, and AdGuard for Safari.
AdGuard 内容拦截器、AdGuard for iOS 和 AdGuard for Safari 不支持带有$cookie修饰符的规则。

`$csp`

This modifier completely changes the rule behavior. If it is applied to a rule, the rule will not block the matching request. Response headers will be modified instead.
此修饰符完全改变了规则行为。如果应用于规则，则该规则不会阻止匹配的请求。响应标头将被修改。

信息

In order to use this type of rules, it is required to have the basic understanding of the Content Security Policy security layer.
为了使用此类规则，需要对内容安全策略安全层有基本的了解。

For the requests matching a $csp rule, we will strengthen response security policy by enhancing the content security policy, similar to the content security policy of the $csp modifier contents. $csp rules are applied independently from any other rule type. Only document-level exceptions can influence it (see the examples section), but no other basic rules.

Multiple rules matching a single request

In case if multiple $csp rules match a single request, we will apply each of them.

Syntax

$csp value syntax is similar to the Content Security Policy header syntax.

$csp value can be empty in the case of exception rules. See examples section below.

Examples

||example.org^$csp=frame-src 'none' blocks all frames on example.org and its subdomains.
@@||example.org/page/*$csp=frame-src 'none' disables all rules with the $csp modifier exactly matching frame-src 'none' on all the pages matching the rule pattern. For instance, the rule above.
@@||example.org/page/*$csp disables all the $csp rules on all the pages matching the rule pattern.
||example.org^$csp=script-src 'self' 'unsafe-eval' http: https: disables inline scripts on all the pages matching the rule pattern.
@@||example.org^$document or @@||example.org^$urlblock disables all the $csp rules on all the pages matching the rule pattern.

Restrictions

There are a few characters forbidden in the $csp value: ,, $.
$csp rules support three types of modifiers: $domain, $important, $subdocument.
Rules with report-* directives are considered invalid.

Compatibility

Rules with $csp modifier are not supported by AdGuard Content Blocker, AdGuard for iOS and AdGuard for Safari.

`$hls`

$hls rules modify the response of a matching request. They are intended as a convenient way to remove segments from HLS playlists (RFC 8216).

注意

The word "segment" in this document means either a "Media Segment" or a "playlist" as part of a "Master Playlist": $hls rules do not distinguish between a "Master Playlist" and a "Media Playlist".

Syntax

||example.org^$hls=urlpattern removes segments whose URL matches the URL pattern urlpattern. The pattern works just like the one in basic URL rules, however, the characters /, $ and , must be escaped with \ inside urlpattern.
||example.org^$hls=/regexp/options removes segments where the URL or one of the tags (for certain options, if present) is matched by the regular expression regexp. Available options are:
- t — instead of testing the segment's URL, test each of the segment's tags against the regular expression. A segment with a matching tag is removed;
- i — make the regular expression case-insensitive.

The characters /, $ and , must be escaped with \ inside regexp.

Exceptions

Basic URL exceptions shall not disable rules with $hls modifier. They can be disabled as described below:

@@||example.org^$hls disables all $hls rules for responses from URLs matching ||example.org^.
@@||example.org^$hls=text disables all $hls rules with the value of the $hls modifier equal to text for responses from URLs matching ||example.org^.

提示

$hls rules can also be disabled by $document, $content and $urlblock exception rules.

注意

When multiple $hls rules match the same request, their effect is cumulative.

Examples

||example.org^$hls=\/videoplayback^?*&source=dclk_video_ads removes all segments with the matching URL.
||example.org^$hls=/\/videoplayback\/?\?.*\&source=dclk_video_ads/i achieves more or less the same with a regular expression instead of a URL pattern.
||example.org^$hls=/#UPLYNK-SEGMENT:.*\,ad/t removes all segments which have the matching tag.

Anatomy of an HLS playlist

A quick summary of the specification:

An HLS playlist is a collection of text lines
A line may be empty, a comment (starts with #), a tag (also starts with #, can only be recognized by name) or a URL
A URL line is called a "segment"
Tags may apply to a single segment, i.e. the first URL line after the tag, to all segments following the tag and until the tag with the same name, or to the whole playlist

Some points specific to the operation of $hls rules:

When a segment is removed, all of the tags that apply only to that segment are also removed
When there is a tag that applies to multiple segments, and all of those segments are removed, the tag is also removed
Since there is no way to recognize different kinds of tags by syntax, we recognize all of the tags specified by the RFC, plus some non-standard tags that we have seen in the field. Any lines starting with # and not recognized as a tag are passed through without modification, and are not matched against the rules
Tags will not be matched if they apply to the entire playlist, and $hls rules cannot be used to remove them, as these rule types are intended for segment removals. If you know what you are doing, you can use $replace rules to remove or rewrite just a single tag from the playlist

An example of a transformation done by the rules:

Original response

Applied rules

Modified response

Restrictions

Rules with the $hls modifier can only be used in trusted filters.
$hls rules are compatible with the modifiers $domain, $third-party, $strict-third-party, $strict-first-party, $app, $important, $match-case, and $xmlhttprequest only.
$hls rules only apply to HLS playlists, which are UTF-8 encoded text starting with the line #EXTM3U. Any other response will not be modified by these rules.
$hls rules do not apply if the size of the original response is more than 10 MB.

Compatibility

Rules with the $hls modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.10 or later.

`$inline-script`

The $inline-script modifier is designed to block inline JavaScript embedded into the web page, using Content Security Policy (CSP). It improves security and privacy by preventing application of inline ads or potentially malicious scripts. The rule ||example.org^$inline-script is converting into the CSP-syntax rule:

||example.org^$csp=script-src 'self' 'unsafe-eval' http: https: data: blob: mediastream: filesystem:

`$inline-font`

The $inline-font modifier is designed to block inline fonts embedded into the web page, using Content Security Policy (CSP). It improves security and privacy by preventing application of inline fonts that could be used for data collection and fingerprinting. The rule ||example.org^$inline-font is converting into the CSP-syntax rule:

||example.org^$csp=font-src 'self' 'unsafe-eval' http: https: data: blob: mediastream: filesystem:

`$jsonprune`

$jsonprune rules modify the response to a matching request by removing JSON items that match a modified JSONPath expression. They do not modify responses which are not valid JSON documents.

In AdGuard for Windows, Mac, and Android with CoreLibs v1.11 or later, $jsonprune also supports modifying JSONP (padded JSON) documents.
在带有CoreLibs v1.11 或更高版本的 Windows、Mac 和 Android 版 AdGuard 中， $jsonprune还支持修改 JSONP（填充 JSON）文档。

Syntax

||example.org^$jsonprune=expression removes items that match the modified JSONPath expression expression from the response.
||example.org^$jsonprune=expression 从响应中删除与修改后的 JSONPath expression匹配的项目。

Due to the way rule parsing works, the characters $ and , must be escaped with \ inside expression.
由于规则解析的工作方式，字符$和,必须在expression内使用\进行转义。

The modified JSONPath syntax has the following differences from the original:
修改后的 JSONPath 语法与原始语法有以下差异：

Script expressions are not supported
不支持脚本表达式
The supported filter expressions are:
支持的过滤器表达式有：
- ?(has <key>) — true if the current object has the specified key
  ?(has <key>) — 如果当前对象具有指定的键，则为 true
- ?(key-eq <key> <value>) — true if the current object has the specified key, and its value is equal to the specified value
  ?(key-eq <key> <value>) — 如果当前对象具有指定的键，并且其值等于指定的值，则为 true
- ?(key-substr <key> <value>) — true if the specified value is a substring of the value of the specified key of the current object
  ?(key-substr <key> <value>) — 如果指定值是当前对象的指定键值的子字符串，则为 true
Whitespace outside of double- or single-quoted strings has no meaning
双引号或单引号字符串之外的空格没有意义
Both double- and single-quoted strings can be used
双引号和单引号字符串都可以使用
Expressions ending with .. are not supported
不支持以..结尾的表达式
Multiple array slices can be specified in square brackets
可以在方括号中指定多个数组切片

There are various online tools that make working with JSONPath expressions more convenient:
有各种在线工具可以使使用 JSONPath 表达式更加方便：

https://www.site24x7.com/tools/jsonpath-finder-validator.html https://jsonpathfinder.com/ https://jsonpath.com/

Keep in mind, though, that all JSONPath implementations have unique features/quirks and are subtly incompatible with each other.
但请记住，所有 JSONPath 实现都有独特的功能/怪癖，并且彼此之间存在微妙的不兼容。

Exceptions 例外情况

Basic URL exceptions shall not disable rules with the $jsonprune modifier. They can be disabled as described below:
基本 URL 例外不得禁用带有$jsonprune修饰符的规则。可以按如下所述禁用它们：

@@||example.org^$jsonprune disables all $jsonprune rules for responses from URLs matching ||example.org^.
@@||example.org^$jsonprune对来自匹配||example.org^ URL 的响应禁用所有$jsonprune规则。
@@||example.org^$jsonprune=text disables all $jsonprune rules with the value of the $jsonprune modifier equal to text for responses from URLs matching ||example.org^.
@@||example.org^$jsonprune=text 禁用所有$jsonprune规则，其$jsonprune修饰符的值等于来自匹配||example.org^ URL 的响应的text 。

$jsonprune rules can also be disabled by $document, $content and $urlblock exception rules.

注意

When multiple $jsonprune rules match the same request, they are sorted in lexicographical order, the first rule is applied to the original response, and each of the remaining rules is applied to the result of applying the previous one.

Examples

||example.org^$jsonprune=\$..[one\, "two three"] removes all occurrences of the keys "one" and "two three" anywhere in the JSON document.

Input

Output

||example.org^$jsonprune=\$.a[?(has ad_origin)] removes all children of a that have an ad_origin key.

Input

Output

||example.org^$jsonprune=\$.*.*[?(key-eq 'Some key' 'Some value')] removes all items that are at nesting level 3 and have a property "Some key" equal to "Some value".

Input

Output

Nested JSONPath expressions

In AdGuard for Windows, Mac and Android with CoreLibs v1.11 or later, JSONPath expressions may be used as keys in filter expressions.

||example.org^$jsonprune=\$.elems[?(has "\$.a.b.c")] removes all children of elems which have a property selectable by the JSONPath expression $.a.b.c.

Input

Output

||example.org^$jsonprune=\$.elems[?(key-eq "\$.a.b.c" "abc")] removes all children of elems which have a property selectable by the JSONPath expression $.a.b.c with a value equal to "abc".

Input

Output

Restrictions

$jsonprune rules are only compatible with these modifiers: $domain, $third-party, $strict-third-party, $strict-first-party, $app, $important, $match-case, and $xmlhttprequest.
$jsonprune rules do not apply if the size of the original response is greater than 10 MB.

Compatibility

Rules with the $jsonprune modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.10 or later.

`$xmlprune`

$xmlprune rules modify the response to a matching request by removing XML items that match an XPath 1.0 expression. The expression must return a node-set. $xmlprune rules do not modify responses which are not well-formed XML documents.

Syntax

||example.org^$xmlprune=expression removes items that match the XPath expression expression from the response.
||example.org^$xmlprune=expression 从响应中删除与 XPath expression匹配的项目。

Exceptions 例外情况

Basic URL exceptions shall not disable rules with the $xmlprune modifier. They can be disabled as described below:
基本 URL 例外不得禁用带有$xmlprune修饰符的规则。可以按如下所述禁用它们：

@@||example.org^$xmlprune disables all $xmlprune rules for responses from URLs matching ||example.org^.
@@||example.org^$xmlprune对来自匹配||example.org^ URL 的响应禁用所有$xmlprune规则。
@@||example.org^$xmlprune=text disables all $xmlprune rules with the value of the $xmlprune modifier equal to text for responses from URLs matching ||example.org^.
@@||example.org^$xmlprune=text 禁用所有$xmlprune规则，其中$xmlprune修饰符的值等于来自匹配||example.org^ URL 的响应的text 。

$xmlprune rules can also be disabled by $document, $content and $urlblock exception rules.
$xmlprune规则也可以通过$document 、 $content和$urlblock异常规则禁用。

注意

When multiple $xmlprune rules match the same request, they are applied in lexicographical order.
当多个$xmlprune规则匹配同一请求时，它们将按字典顺序应用。

Examples 示例

||example.org^$xmlprune=/bookstore/book[position() mod 2 = 1] removes odd-numbered books from the bookstore.
||example.org^$xmlprune=/bookstore/book[position() mod 2 = 1] 从书店中删除奇数书籍。

Input

Output

||example.org^$xmlprune=/bookstore/book[year = 2003] removes books from the year 2003 from the bookstore.
||example.org^$xmlprune=/bookstore/book[year = 2003] 从书店中删除 2003 年的书籍。

Input

Output

||example.org^$xmlprune=//*/@* removes all attributes from all elements.

Input

Output

Restrictions

$xmlprune rules are only compatible with these modifiers: $domain, $third-party, $strict-third-party, $strict-first-party, $app, $important, $match-case, and $xmlhttprequest.
$xmlprune rules do not apply if the size of the original response is greater than 10 MB.

Compatibility

Rules with the $xmlprune modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.15 or later.

`$network`

This is basically a Firewall-like rule allowing to fully block or unblock access to a specified remote address.

$network rules match IP addresses only! You cannot use them to block or unblock access to a domain.
To match an IPv6 address, you have to use the collapsed syntax, e.g. use [2001:4860:4860::8888]$network instead of [2001:4860:4860:0:0:0:0:8888]$network.
要匹配 IPv6 地址，您必须使用折叠语法，例如使用 [2001:4860:4860::8888]$network 而不是 [2001:4860:4860:0:0:0:0:8888]$network 。
An allowlist $network rule makes AdGuard bypass data to the matching endpoint, hence there will be no further filtering at all.
白名单$network规则使 AdGuard 绕过数据到匹配的端点，因此根本不会进行进一步的过滤。
If the IP part starts and ends with / character, it is treated as a regular expression.
如果 IP 部分以/字符开头和结尾，则将其视为正则表达式。

We recommend to get acquainted with this article for better understanding of regular expressions.
我们建议您熟悉本文，以便更好地理解正则表达式。

Restrictions 限制

The $network modifier can only be used in rules together with the $app and $important modifiers, and not with any other modifiers.
$network修饰符只能在规则中与$app和$important修饰符一起使用，而不能与任何其他修饰符一起使用。

Examples 示例

174.129.166.49:3478^$network blocks access to 174.129.166.49:3478 (but not to 174.129.166.49:34788).
174.129.166.49:3478^$network阻止访问174.129.166.49:3478 （但不阻止174.129.166.49:34788 ）。
[2001:4860:4860::8888]:443^$network blocks access to [2001:4860:4860::8888]:443.
174.129.166.49$network blocks access to 174.129.166.49:*.
@@174.129.166.49$network makes AdGuard bypass data to the endpoint. No other rules will be applied.
@@174.129.166.49$network使 AdGuard 绕过数据到端点。不适用其他规则。
/.+:3[0-9]{4}/$network blocks access to any port from 30000 to 39999.
/.+:3[0-9]{4}/$network阻止访问 30000 到 39999 之间的任何端口。
/8.8.8.(:?8|4)/$network blocks access to both 8.8.8.8 and 8.8.8.4.
/8.8.8.(:?8|4)/$network阻止访问8.8.8.8和8.8.8.4 。

Compatibility

Only AdGuard for Windows, Mac, and Android are technically capable of using rules with $network modifier.
从技术上讲，只有适用于 Windows、Mac 和 Android 的 AdGuard 能够使用带有$network修饰符的规则。

`$permissions`

信息

In order to use this type of rules, it is required to have a basic understanding of the Permissions Policy security layer.
为了使用此类规则，需要对权限策略安全层有基本的了解。

For the requests matching a $permissions rule, AdGuard strengthens response's permissions policy by adding an additional permission policy equal to the $permissions modifier contents. $permissions rules are applied independently from any other rule type. Only document-level exceptions can influence it (see the examples section), but no other basic rules.
对于匹配$permissions规则的请求，AdGuard 通过添加与$permissions修饰符内容相同的附加权限策略来增强响应的权限策略。 $permissions规则的应用独立于任何其他规则类型。只有文档级异常可以影响它（请参阅示例部分），但没有其他基本规则。

Syntax

$permissions value syntax is identical to that of the Permissions-Policy header syntax with the following exceptions:

A comma that separates multiple features MUST be escaped — see examples below.
A pipe character (|) can be used instead of a comma to separate features.

The list of available directives is available here.

$permissions value can be empty in the case of exception rules — see examples below.

Examples

||example.org^$permissions=autoplay=() disallows autoplay media requested through the HTMLMediaElement interface across example.org.
@@||example.org/page/*$permissions=autoplay=() disables all rules with the $permissions modifier exactly matching autoplay=() on all the pages matching the rule pattern. For instance, the rule above. It is important to note that the exception rule only takes effect in the case of an exact value match. For example, if you want to disable the rule $permissions=a=()\,b=(), you need exception rule @@$permissions=a=()\,b=(), and not @@$permissions=b=()\,a=(), nor @@$permissions=b=() because b=()\,a=() or b=() does not match with a=()\,b=().
@@||example.org/page/*$permissions disables all the $permissions rules on all the pages matching the rule pattern.
$domain=example.org|example.com,permissions=storage-access=()\, camera=() disallows using the Storage Access API to request access to unpartitioned cookies and using video input devices across example.org and example.com.
$domain=example.org|example.com,permissions=storage-access=()|camera=() does the same — a | can be used to separate the features instead of an escaped comma.
@@||example.org^$document or @@||example.org^$urlblock disables all the $permission rules on all the pages matching the rule pattern.

注意

$permissions rules only take effect for main frame and sub frame requests. This means they are applied when a page is loaded or when an iframe is loaded.

注意

If there are multiple $permissions rules that match the same request, multiple Permissions-Policy headers will be added to the response for each rule with their $permissions value. So if you have two rules: ||example.org^$permissions=autoplay=() and ||example.org^$permissions=geolocation=()\,camera=() that match the same request, the response will contain two Permissions-Policy headers: autoplay=() and geolocation=()\,camera=().

`$permissions` modifier limitations

Limitations

Firefox ignores the Permissions-Policy header. For more information, see this issue.

Restrictions

Characters forbidden in the $permissions value: $.
$permissions is compatible with a limited set of modifiers: $domain, $important, $subdocument, and content-type modifiers.
$permissions rules that do not have any content-type modifiers will match only requests where content type is document.

Compatibility

Rules with the $permissions modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.11 or later, and AdGuard Browser Extension with TSUrlFilter v3.0.0 or later.
Pipe separator | instead of escaped comma is supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.14 or later, and AdGuard Browser Extension with TSUrlFilter v3.0.0 or later.

`$redirect`

AdGuard is able to redirect web requests to a local "resource".

Syntax

AdGuard uses the same filtering rule syntax as uBlock Origin. Also, it is compatible with ABP $rewrite=abp-resource modifier.

$redirect is a modifier for the basic filtering rules so rules with this modifier support all other basic modifiers like $domain, $third-party, $script, etc.

The value of the $redirect modifier must be the name of the resource that will be used for redirection.

Disabling `$redirect` rules

||example.org/script.js$script,redirect=noopjs — this rule redirects all requests to example.org/script.js to the resource named noopjs.
||example.org/test.mp4$media,redirect=noopmp4-1s — this rule redirects all requests to example.org/test.mp4 to the resource named noopmp4-1s.
@@||example.org^$redirect will disable all $redirect rules for URLs that match ||example.org^.
@@||example.org^$redirect=nooptext will disable all rules with $redirect=nooptext for any request that matches ||example.org^.

More information on redirects and their usage is available on GitHub.

Priorities of `$redirect` rules

$redirect rules have higher priority than regular basic blocking rules. This means that if there is a basic blocking rule, the $redirect rule will override it. Allowlist rules with @@ mark have higher priority than $redirect rules. If a basic rule with the $important modifier and the $redirect rule matches the same URL, the latter is overridden unless it's also marked as $important.

In short: $important > @@ > $redirect > basic rules.

Go to rules priorities for more details.

`$redirect` modifier limitations

Limitations

In AdGuard for Chrome MV3 allowlist rules with $redirect are not supported.

Compatibility

Rules with $redirect modifier are not supported by AdGuard Content Blocker, AdGuard for iOS, and AdGuard for Safari .
$redirect in uBlock Origin supports specifying priority, e.g. $redirect=noopjs:42. AdGuard does not support it and instead just discards the priority postfix.

`$redirect-rule`

This is basically an alias to $redirect since it has the same "redirection" values and the logic is almost similar. The difference is that $redirect-rule is applied only in the case when the target request is blocked by a different basic rule.

Go to rules priorities for more details.

Negating $redirect-rule works exactly the same way as for regular $redirect rules. Even more than that, @@||example.org^$redirect will negate both $redirect and $redirect-rule rules.

Examples

||example.org/script.js
||example.org^$redirect-rule=noopjs

In this case, only requests to example.org/script.js will be "redirected" to noopjs. All other requests to example.org will be kept intact.

Compatibility

Rules with $redirect-rule modifier are not supported by AdGuard Content Blocker, AdGuard for iOS, AdGuard for Safari, and AdGuard for Chrome MV3. The discussion about adding support for $redirect-rule rules in Chrome MV3 extensions is currently open.

`$referrerpolicy`

These rules allow overriding of a page's referrer policy. Responses to matching requests will have all of their Referrer-Policy headers replaced with a single header with the value equal to the matching rule's modifier value. If the response carries an HTML document with a <meta name="referrer"... tag, the content attribute of the tag will also be replaced with the modifier value.

An exception rule with a modifier value disables the blocking rule with the same modifier value. An exception rule without a modifier value disables all matched referrer-policy rules.

If a request matches multiple $referrerpolicy rules not disabled by exceptions, only one of them (it is not specified which one) is applied. $referrerpolicy rules without specified content-type modifiers apply to $document and $subdocument content types.

Examples

||example.com^$referrerpolicy=unsafe-url overrides the referrer policy for example.com with unsafe-url.
@@||example.com^$referrerpolicy=unsafe-url disables the previous rule.
@@||example.com/abcd.html^$referrerpolicy disables all $referrerpolicy rules on example.com/abcd.html.

Compatibility

Rules with the $referrerpolicy modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.12 or later.

`$removeheader`

Rules with $removeheader modifier are intended to remove headers from HTTP requests and responses. The initial motivation for this rule type is to be able to get rid of the Refresh header which is often used to redirect users to an undesirable location. However, this is not the only case where this modifier can be useful.

Just like $csp, $redirect, $removeparam, and $cookie, this modifier exists independently, rules with it do not depend on the regular basic rules, i.e. regular exception or blocking rules will not affect it. By default, it only affects response headers. However, you can also change it to remove headers from HTTP requests as well.

Syntax

Basic syntax

||example.org^$removeheader=header-name removes a response header called header-name
||example.org^$removeheader=request:header-name removes a request header called header-name

$removeheader is case-insensitive, but we suggest always using lower case.

Negating $removeheader

This type of rules works pretty much the same way it works with $csp and $redirect modifiers.

Use @@ to negate $removeheader:

@@||example.org^$removeheader negates all $removeheader rules for URLs that match ||example.org^.
@@||example.org^$removeheader=header negates the rule with $removeheader=header for any request matching ||example.org^.

$removeheader rules can also be disabled by $document and $urlblock exception rules. But basic exception rules without modifiers will not do that. For example, @@||example.com^ will not disable $removeheader=p for requests to example.com, but @@||example.com^$urlblock will.

注意

In case of multiple $removeheader rules matching a single request, we will apply each of them one by one.

Examples

||example.org^$removeheader=refresh removes Refresh header from all HTTP responses returned by example.org and its subdomains.
||example.org^$removeheader=request:x-client-data removes X-Client-Data header from all HTTP requests.
Next block of rules removes Refresh and Location headers from all HTTP responses returned by example.org save for requests to example.org/path/*, for which no headers will be removed:
```
||example.org^$removeheader=refresh
||example.org^$removeheader=location
@@||example.org/path/$removeheader
```

Restrictions

This type of rules can only be used in trusted filters.

In order to avoid compromising the security $removeheader cannot remove headers from the list below:
- access-control-allow-origin
- access-control-allow-credentials
- access-control-allow-headers
- access-control-allow-methods
- access-control-expose-headers
- access-control-max-age
- access-control-request-headers
- access-control-request-method
- origin
- timing-allow-origin
- allow
- cross-origin-embedder-policy
- cross-origin-opener-policy
- cross-origin-resource-policy
- content-security-policy
- content-security-policy-report-only
- expect-ct
- feature-policy
- origin-isolation
- strict-transport-security
- upgrade-insecure-requests
- x-content-type-options
- x-download-options
- x-frame-options
- x-permitted-cross-domain-policies
- x-powered-by
- x-xss-protection
- public-key-pins
- public-key-pins-report-only
- sec-websocket-key
- sec-websocket-extensions
- sec-websocket-accept
- sec-websocket-protocol
- sec-websocket-version
- p3p
- sec-fetch-mode
- sec-fetch-dest
- sec-fetch-site
- sec-fetch-user
- referrer-policy
- content-type
- content-length
- accept
- accept-encoding
- host
- connection
- transfer-encoding
- upgrade
$removeheader rules are only compatible with $domain, $third-party, $strict-third-party, $strict-first-party, $app, $important, $match-case, and content type modifiers such as $script and $stylesheet. The rules which have any other modifiers are considered invalid and will be discarded.

Compatibility

Rules with $removeheader modifier are supported by AdGuard for Windows, AdGuard for Mac, AdGuard for Android, and AdGuard Browser Extension for Chrome, Firefox, and Edge.

`$removeparam`

注意

$queryprune is an alias of $removeparam. Since $queryprune is deprecated, avoid using it and use $removeparam instead.

Rules with $removeparam modifier are intended to strip query parameters from requests' URLs. Please note that such rules are only applied to GET, HEAD, OPTIONS, and sometimes POST requests.

Syntax

Basic syntax

$removeparam=param removes query parameter with the name param from URLs of any request, e.g. a request to http://example.com/page?param=1&another=2 will be transformed into http://example.com/page?another=2.

Regular expressions

You can also use regular expressions to match query parameters and/or their values:

$removeparam=/regexp/[options] — removes query parameters that matches the regexp regular expression from URLs of any request. Unlike basic syntax, it means "remove query parameters normalized to a name=value string which match the regexp regular expression". [options] here is the list of regular expression options. At the moment, the only supported option is i which makes matching case-insensitive.

Escaping special characters

Do not forget to escape special characters like ,, / and $ in the regular expressions. Use \ character for that purpose. For example, an escaped comma should look like this: \,.

注意

Regexp-type rules target both name and value of the parameter. To minimize mistakes, it is safer to start every regexp with /^ unless you specifically target parameter values.

We will try to detect and ignore unescaped $ automatically using a simple rule of thumb — it is not an options delimiter if all three are true:

It looks like $/
There is another slash character / to the left of it
There is another unescaped dollar sign $ to the left of that slash character

Remove all query parameters

Specify naked $removeparam to remove all query parameters:

||example.org^$removeparam — removes all query parameters from URLs matching ||example.org^.

Inversion

Use ~ to apply inversion:

$removeparam=~param — removes all query parameters with the name different from param.
$removeparam=~/regexp/ — removes all query parameters that do not match the regexp regular expression.

Negating $removeparam

This sort of rules work pretty much the same way it works with $csp and $redirect modifiers.

Use @@ to negate $removeparam:

@@||example.org^$removeparam negates all $removeparam rules for URLs that match ||example.org^.
@@||example.org^$removeparam=param negates the rule with $removeparam=param for any request matching ||example.org^.
@@||example.org^$removeparam=/regexp/ negates the rule with $removeparam=/regexp/ for any request matching ||example.org^.

Multiple rules matching a single request

In the case when multiple $removeparam rules match a single request, each of them will be applied one by one.

Examples

$removeparam=/^(utm_source|utm_medium|utm_term)=/
$removeparam=/^(utm_content|utm_campaign|utm_referrer)=/
@@||example.com^$removeparam

With these rules some UTM parameters will be stripped out from any request, except that requests to example.com will not be stripped at all, e.g. http://google.com/page?utm_source=s&utm_referrer=fb.com&utm_content=img will be transformed to http://google.com/page, but http://example.com/page?utm_source=s&utm_referrer=fb.com&utm_content=img will not be affected by the blocking rule.

$removeparam=utm_source removes utm_source query parameter from all requests.
$removeparam=/utm_.*/ removes all utm_* query parameters from URL queries of any request, e.g. a request to http://example.com/page?utm_source=test will be transformed to http://example.com/page.
$removeparam=/^utm_source=campaign$/ removes utm_source query parameter with the value equal to campaign. It does not touch other utm_source parameters.

Negating one $removeparam rule and replacing it with a different rule

$removeparam=/^(gclid|yclid|fbclid)=/
@@||example.com^$removeparam=/^(gclid|yclid|fbclid)=/
||example.com^$removeparam=/^(yclid|fbclid)=/

With these rules, Google, Yandex, and Facebook Click IDs will be removed from all requests. There is one exception: Google Click ID (gclid) will not be removed from requests to example.com.

Negating $removeparam for all parameters

$removeparam=/^(utm_source|utm_medium|utm_term)=/
$removeparam=/^(utm_content|utm_campaign|utm_referrer)=/
@@||example.com^$removeparam

With these rules, specified UTM parameters will be removed from any request save for requests to example.org.

$removeparam rules can also be disabled by $document and $urlblock exception rules. But basic exception rules without modifiers do not do that. For example, @@||example.com^ will not disable $removeparam=p for requests to example.com, but @@||example.com^$urlblock will.

`$removeparam` modifier limitations

Limitations

AdGuard for Chrome MV3 has some limitations:

Regular expressions, negation and allowlist rules are not supported.

Group of similar $removeparam rules will be combined into one. Example:

||testcases.adguard.com$xmlhttprequest,removeparam=p1case1
||testcases.adguard.com$xmlhttprequest,removeparam=p2case1
||testcases.adguard.com$xmlhttprequest,removeparam=P3Case1
$xmlhttprequest,removeparam=p1case2

转换为

[
{
  "id": 1,
  "action": {
  "type": "redirect",
  "redirect": {
    "transform": {
    "queryTransform": {
      "removeParams": [
      "p1case1",
      "p2case1",
      "P3Case1"
      ]
    }
    }
  }
  },
  "condition": {
  "urlFilter": "||testcases.adguard.com",
  "resourceTypes": [
    "xmlhttprequest"
  ],
  "isUrlFilterCaseSensitive": false
  }
},
{
  "id": 4,
  "action": {
  "type": "redirect",
  "redirect": {
    "transform": {
    "queryTransform": {
      "removeParams": [
      "p1case2"
      ]
    }
    }
  }
  },
  "condition": {
  "resourceTypes": [
    "xmlhttprequest"
  ],
  "isUrlFilterCaseSensitive": false
  }
}
]

Restrictions

Rules with the $removeparam modifier can only be used in trusted filters.
$removeparam rules are compatible with basic modifiers, content-type modifiers, and with the $important and $app modifiers. Rules with any other modifiers are considered invalid and will be discarded.
$removeparam rules without content type modifiers will only match requests where the content type is document.

Compatibility

Rules with $removeparam modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.7 or later, and AdGuard Browser Extension v3.6 or later.
$removeparam syntax for regular expressions is supported AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.8 or later, and AdGuard Browser Extension v4.0 or later.
POST request types are supported only by AdGuard for Windows, Mac, and Android with CoreLibs v1.10 or later, and AdGuard Browser Extension with TSWebExtension v0.4.6 or later.

`$replace`

This modifier completely changes the rule behavior. If it is applied, the rule will not block the request. The response is going to be modified instead.

You will need some knowledge of regular expressions to use $replace modifier.

Features

$replace rules apply to any text response, but will not apply to binary (media, image, object, etc.).
$replace rules do not apply if the size of the original response is more than 10 MB.
$replace rules have a higher priority than other basic rules (including exception rules). So if a request natches two different rules, one of which has the $replace modifier, this rule will be applied.
Document-level exception rules with $content or $document modifiers do disable $replace rules for requests matching them.
Other document-level exception rules ($generichide, $elemhide or $jsinject modifiers) are applied alongside $replace rules. It means that you can modify the page content with a $replace rule and disable cosmetic rules there at the same time.

$replace value can be empty in the case of exception rules. See examples section for further information.

Multiple rules matching a single request

In case if multiple $replace rules match a single request, we will apply each of them. The order is defined alphabetically.

Syntax

In general, $replace syntax is similar to replacement with regular expressions in Perl.

replace = "/" regexp "/" replacement "/" modifiers

regexp — a regular expression.
replacement — a string that will be used to replace the string corresponding to regexp.
modifiers — a regular expression flags. For example, i — insensitive search, or s — single-line mode.

In the $replace value, two characters must be escaped: comma , and dollar sign $. Use backslash \ for it. For example, an escaped comma looks like this: \,.

Examples

||example.org^$replace=/(<VAST[\s\S]*?>)[\s\S]*<\/VAST>/\$1<\/VAST>/i

There are three parts in this rule:

regexp — (<VAST(.|\s)*?>)(.|\s)*<\/VAST>;
replacement — \$1<\/VAST> where $ is escaped;
modifiers — i for insensitive search.

You can see how this rule works here: http://regexr.com/3cesk

Multiple $replace rules

||example.org^$replace=/X/Y/
||example.org^$replace=/Z/Y/
@@||example.org/page/*$replace=/Z/Y/

Both rule 1 and 2 will be applied to all requests sent to example.org.
Rule 2 is disabled for requests matching ||example.org/page/, but rule 1 still works!

Disabling $replace rules

@@||example.org^$replace will disable all $replace rules matching ||example.org^.
@@||example.org^$document or @@||example.org^$content will disable all $replace rules originated from pages of example.org including the page itself.

Restrictions

Rules with the $replace modifier can only be used in trusted filters.

Compatibility

Rules with $replace modifier are supported by AdGuard for Windows, AdGuard for Mac, AdGuard for Android, and AdGuard Browser Extension for Firefox. Such rules do not work in extensions for other browsers because they are unable to modify content on the network level.

`$urltransform`

The $urltransform rules allow you to modify the request URL by replacing text matched by a regular expression.

Features

$urltransform rules normally only apply to the path and query parts of the URL, see below for one exception.
$urltransform will not be applied if the original URL is blocked by other rules.
$urltransform will be applied before $removeparam rules.

The $urltransform value can be empty for exception rules.

Multiple rules matching a single request

If multiple $urltransform rules match a single request, we will apply each of them. The order is defined alphabetically.

Syntax

$urltransform syntax is similar to replacement with regular expressions in Perl.

urltransform = "/" regexp "/" replacement "/" modifiers

regexp — a regular expression.
replacement — a string that will be used to replace the string corresponding to regexp.
modifiers — a regular expression flags. For example, i — insensitive search, or s — single-line mode.

In the $urltransform value, two characters must be escaped: the comma , and the dollar sign $. Use the backslash character \ for this. For example, an escaped comma looks like this: \,.

Changing the origin

Compatibility

This section only applies to AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.17 or later.

As stated above, normally $urltransform rules are only allowed to change the path and query parts of the URL. However, if the rule's regexp begins with the string ^http, then the full URL is searched and can be modified by the rule. Such a rule will not be applied if the URL transformation can not be achieved via an HTTP redirect (for example, if the request's method is POST).

Examples

||example.org^$urltransform=/(pref\/).*\/(suf)/\$1\$2/i

There are three parts in this rule:

regexp — (pref\/).*\/(suf);
replacement — \$1\$2 where $ is escaped;
modifiers — i for insensitive search.

Multiple $urltransform rules

||example.org^$urltransform=/X/Y/
||example.org^$urltransform=/Z/Y/
@@||example.org/page/*$urltransform=/Z/Y/

Both rule 1 and 2 will be applied to all requests sent to example.org.
Rule 2 is disabled for requests matching ||example.org/page/, but rule 1 still works!

Re-matching rules after transforming the URL

After applying all matching $urltransform rules, the transformed request will be matched against all other rules:

E.g., with the following rules:

||example.com^$urltransform=/firstpath/secondpath/
||example.com/secondpath^

the request to https://example.com/firstpath will be blocked.

Disabling $urltransform rules

@@||example.org^$urltransform will disable all $urltransform rules matching ||example.org^.
@@||example.org^$urltransform=/Z/Y/ will disable the rule with $urltransform=/Z/Y/ for any request matching ||example.org^.

$urltransform rules can also be disabled by $document and $urlblock exception rules. But basic exception rules without modifiers do not do that. For example, @@||example.com^ will not disable $urltransform=/X/Y/ for requests to example.com, but @@||example.com^$urlblock will.

Restrictions

Rules with the $urltransform modifier can only be used in trusted filters.

Compatibility

Rules with the $urltransform modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.15 or later.

`noop`

noop modifier does nothing and can be used solely to increase rules' readability. It consists of a sequence of underscore characters (_) of arbitrary length and can appear in a rule as often as needed.

Examples

||example.com$_,removeparam=/^ss\\$/,_,image
||example.com$replace=/bad/good/,___,~third-party

Compatibility

Rules with noop modifier are not supported by AdGuard Content Blocker.

`$empty` (deprecated)

Deprecation notice

This modifier is deprecated in favor of the $redirect modifier. Rules with $empty are still supported and being converted into $redirect=nooptext now but the support shall be removed in the future.

Usually, blocked requests look like a server error to browser. If you use $empty modifier, AdGuard will emulate a blank response from the server with200 OK status.

Examples

||example.org^$empty returns an empty response to all requests to example.org and all subdomains.

Compatibility

Rules with $empty modifier are not supported by AdGuard Content Blocker, AdGuard for iOS, and AdGuard for Safari.

`$mp4` (deprecated)

Deprecation notice

This modifier is deprecated in favor of the $redirect modifier. Rules with $mp4 are still supported and being converted into $redirect=noopmp4-1s,media now but the support shall be removed in the future.

As a response to blocked request AdGuard returns a short video placeholder.

Examples

||example.com/videos/$mp4 blocks all video downloads from ||example.com/videos/* and changes the response to a video placeholder.

Compatibility

Rules with $mp4 modifier are not supported by AdGuard Content Blocker, AdGuard for iOS, and AdGuard for Safari.

Rule priorities

Each rule has its own priority, which is necessary when several rules match the request and the filtering engine needs to select one of them. Priority is measured by a positive integer.

Collisions

When two rules with the same priority match the same request, the filter engine implementation determines which one is chosen.

信息

The concept of rule priorities becomes increasingly important in light of Manifest V3, as the existing rules need to be converted to declarativeNetRequest rules.

Priority calculation

To calculate priority, we've categorized modifiers into different groups. These groups are ranked based on their priority, from lowest to highest. A modifier that significantly narrows the scope of a rule adds more weight to its total priority. Conversely, if a rule applies to a broader range of requests, its priority decreases.

It's worth noting that there are cases where a single-parameter modifier has a higher priority than multi-parameter ones. For instance, in the case of $domain=example.com|example.org, a rule that includes two domains has a slightly broader effective area than a rule with one specified domain, therefore its priority is lower.

The base priority of any rule is 1. If the calculated priority is a floating-point number, it will be rounded up to the smallest integer greater than or equal to the calculated priority.

Compatibility

The concept of priority has been introduced in TSUrlFilter v2.1.0 and CoreLibs v1.13. Before that AdGuard didn't have any special priority computation algorithm and collisions handling could be different depending on AdGuard product and version.
AdGuard for iOS, Safari, and AdGuard Content Blocker rely on the browsers implementation and they cannot follow the rules specified here.

注意

Modifier aliases (1p, 3p, etc.) are not included in these categories, however, they are utilized within the engine to compute the rule priority.

Basic modifiers, the presence of each adds 1 to the priority

$app with negated applications using ~,
$denyallow,
$domain with negated domains using ~,
$match-case,
$method with negated methods using ~,
$strict-first-party,
$strict-third-party,
$third-party,
$to,
restricted content-types with ~.

When dealing with a negated domain, app, method, or content-type, we add 1 point for the existence of the modifier itself, regardless of the quantity of negated domains or content-types. This is because the rule's scope is already infinitely broad. Put simply, by prohibiting multiple domains, content-types, methods or apps, the scope of the rule becomes only minimally smaller.

Defined content-type modifiers, defined methods, defined headers, $all, $popup, specific exceptions

All valid content types:

$document,
$font,
$image,
$media,
$object,
$other,
$ping,
$script,
$stylesheet,
$subdocument,
$websocket,
$xmlhttprequest;

This also includes rules that implicitly add all content types:

$all;

Or rules that implicitly add the modifier $document:

$popup;

Or some specific exceptions that implicitly add $document,subdocument:

$content,
$elemhide,
$extension,
$genericblock,
$generichide,
$jsinject,
$specifichide,
$urlblock;

Or allowed methods via $method.

Or rules with $header.

The presence of any content-type modifiers adds (50 + 50 / N), where N is the number of modifiers present, for example: ||example.com^$image,script will add 50 + 50 / 2 = 50 + 25 = 75 to the total weight of the rule.

The $all also belongs to this category, because it implicitly adds all content type modifiers, e.g., $document,subdocument,image,script,media,<etc> + $popup.

The $popup also belongs to this category, because it implicitly adds the modifier $document. Similarly, specific exceptions add $document,subdocument.

If there is a $method modifier in the rule with allowed methods it adds (50 + 50 / N), where N is the number of methods allowed, for example: ||example.com^$method=GET|POST|PUT will add 50 + 50 / 3 = 50 + 16.6 = 67 to the total weight of the rule.

If there is a $header modifier in the rule, it adds 50.

`$domain` or `$app` with allowed domains or applications

Specified domains through $domain or specified applications through $app add 100 + 100 / N, where N is the number of modifier values for example: ||example.com^$domain=example.com|example.org|example.net will add 100 + 100 / 3 = 134.3 = 135 or ||example.com^$app=org.example.app1|org.example.app2 will add 100 + 100 / 2 = 151 or ||example.com^$domain=example.com,app=org.example.app1|org.example.app2 will add 100 + 100/1 ($domain part) and 100 + 100/2 ($app part), totaling 350.

Modifier values that are regexps or tld will be interpreted as normal entries of the form example.com and counted one by one, for example: ||example.com^$domain=example.* will add 100 + 100 / 1 = 200 or ||example.com^$domain=example.*|adguard.* will add 100 + 100 / 2 = 150.

`$redirect` rules

$redirect,
$redirect-rule.

Each of which adds 10^3 to rule priority.

Specific exceptions

$content,
$elemhide,
$extension,
$genericblock,
$generichide,
$jsinject,
$specifichide,
$urlblock;

Each of which adds 10^4 to the priority.

As well as exception with $document modifier: because it's an alias for $elemhide,content,jsinject,urlblock,extension. It will add 10^4 for each modifier from the top list, 10^4 * 5 in total.

In addition, each of these exceptions implicitly adds the two allowed content-type modifiers $document,subdocument.

Allowlist rules

Modifier @@ adds 10^5 to rule priority.

`$important` rules

Modifier $important adds 10^6 to rule priority.

Rules for which there is no priority weight

Other modifiers, which are supposed to perform additional post- or pre-processing of requests, do not add anything to the rules priority.

注意

The $replace modifier takes precedence over all blocking rules of categories 1-3, as well as exception rules from categories 3-5, except $content, because an exception with the $content modifier overrides all $replace rules.

Examples

||example.com^
Weight of the rule without modifiers: 1.
||example.com^$match-case
Rule weight: base weight + weight of the modifier from category 1: 1 + 1 = 2.
||example.org^$removeparam=p
Rule weight: base weight + 0, since $removeparam is not involved in the priority calculation: 1 + 0 = 1.
||example.org^$document,redirect=nooptext
Rule weight: base weight + allowed content type, category 3 + $redirect from category 6: 1 + (100 + 100 / 1) + 1000 = 1201.
@@||example.org^$removeparam=p,document
Rule weight: base weight + allowlist rule, category 5 + 0 because $removeparam is not involved in the priority calculation + allowed content type, category 2: 1 + 10000 + 0 + (50 + 50 / 1) = 10101.
@@||example.com/ad/*$domain=example.org|example.net,important
Rule weight: base weight + allowlist rule, category 5 + important rule, category 7 + allowed domains, category 3: 1 + 10000 + 1000000 + (100 + 100 / 2) = 1010152.
@@||example.org^$document without additional modifiers is an alias for @@||example.com^$elemhide,content,jsinject,urlblock,extension
Rule weight: base weight + specific exceptions, category 4 + two allowed content types (document and subdocument), category 2: 1 + 10000 * 4 + (50 + 50 / 2) = 40076.
*$script,domain=a.com,denyallow=x.com|y.com
Rule weight: base weight + allowed content type, category 2 + allowed domain, category 3 + denyallow, category 1: 1 + (50 + 50/1) + (100 + 100 / 1) + 1 = 303.
||example.com^$all — alias to ||example.com^$document,subdocument,image,script,media,etc. + $popup
Rule weight: base weight + popup (category 1) + allowed content types (category 2): 1 + 1 + (50 + 50/12) = 55.

Non-basic rules

However, basic rules may not be enough to block ads. Sometimes you need to hide an element or change part of the HTML code of a web page without breaking anything. The rules described in this section are created specifically for this purpose.

Categories \ Products	CoreLibs apps	AdGuard for Chromium	AdGuard for Chrome MV3	AdGuard for Firefox	AdGuard iOS版	AdGuard Safari版	AdGuard 内容拦截器
Element hiding	✅	✅	✅	✅	✅	✅	✅
CSS rules	✅	✅	✅	✅	✅	✅	❌
Extended CSS	✅	✅	✅	✅	✅	✅	❌
HTML filtering	✅	❌	❌	✅	❌	❌	❌
JavaScript	✅	✅	✅	✅	✅	✅	❌
Scriptlets	✅	✅	✅	✅	✅	✅	❌

注意

✅ — fully supported
❌ — not supported

Cosmetic rules

信息

Work with non-basic rules requires the basic knowledge of HTML and CSS. So, if you want to learn how to make such rules, we recommend to get acquainted with this documentation.

Element hiding rules

Element hiding rules are used to hide the elements of web pages. It is similar to applying { display: none; } style to selected element.

Element hiding rules may operate differently depending on the platform.

Syntax

   rule = [domains] "##" selector
domains = [domain0, domain1[, ...[, domainN]]]

selector — CSS selector, defines the elements to be hidden.
domains — domain restriction for the rule.

If you want to limit the rule application area to certain domains, just enter them separated with commas. For example: example.org,example.com##selector.

This rule will be also applied to all subdomains of example.org and example.com.

If you want the rule not to be applied to certain domains, start a domain name with ~ sign. For example: ~example.org##selector.

You can use both approaches in a single rule. For example, example.org,~subdomain.example.org##domain will work for example.org and all subdomains, except subdomain.example.org.

注意

Element hiding rules are not dependent on each other. If there is a rule example.org##selector in the filter and you add ~example.org##selector both rules will be applied independently.

Examples

example.com##div.textad — hides a div with the class textad at example.com and all subdomains.
example.com,example.org###adblock — hides an element with attribute id equals adblock at example.com, example.org and all subdomains.
~example.com##.textad — hides an element with the class textad at all domains, except example.com and its subdomains.

限制

Safari does not support both allowed and disallowed domains. So the rules like example.org,~foo.example.org##.textad are invalid in AdGuard for Safari.

Exceptions

Exceptions can disable some rules on particular domains. They are very similar to usual exception rules, but instead of ## you have to use #@#.

For example, there is a rule in filter:

##.textad

If you want to disable it for example.com, you can create an exception rule:

example.com#@#.textad

Sometimes, it may be necessary to disable all restriction rules. For example, to conduct tests. To do this, use the exclusion rule without specifying a domain. It will completely disable matching CSS elemhide rule on ALL domains:

#@#.textad

The same can be achieved by adding this rule:

*#@#.textad

We recommend to use this kind of exceptions only if it is not possible to change the hiding rule itself. In other cases it is better to change the original rule, using domain restrictions.

CSS rules

Sometimes, simple hiding of an element is not enough to deal with advertising. For example, blocking an advertising element can just break the page layout. In this case AdGuard can use rules that are much more flexible than hiding rules. With these rules you can basically add any CSS styles to the page.

Syntax

   rule = [domains] "#$#" selector "{" style "}"
domains = [domain0, domain1[, ...[, domainN]]]

selector — CSS selector, that defines the elements we want to apply the style to.
domains — domain restriction for the rule. Same principles as in element hiding rules.
style — CSS style, that we want to apply to selected elements.

Examples

example.com#$#body { background-color: #333!important; }

This rule will apply a style background-color: #333!important; to the body element at example.com and all subdomains.

Exceptions

Just like with element hiding, there is a type of rules that disable the selected CSS style rule for particular domains. Exception rule syntax is almost the same, you just have to change #$# to #@$#.

For example, there is a rule in filter:

#$#.textad { visibility: hidden; }

If you want to disable it for example.com, you can create an exception rule:

example.com#@$#.textad { visibility: hidden; }

We recommend to use this kind of exceptions only if it is not possible to change the CSS rule itself. In other cases it is better to change the original rule, using domain restrictions.

Restrictions

Styles that lead to loading any resource are forbidden. Basically, it means that you cannot use any <url> type of value in the style.

Compatibility

CSS rules are not supported by AdGuard Content Blocker.

CSS rules may operate differently depending on the platform.

Extended CSS selectors

限制
Pseudo-class :has()
Pseudo-class :contains()
Pseudo-class :matches-css()
Pseudo-class :matches-attr()
Pseudo-class :matches-property()
Pseudo-class :xpath()
Pseudo-class :nth-ancestor()
Pseudo-class :upward()
Pseudo-class :remove() and pseudo-property remove
Pseudo-class :is()
Pseudo-class :not()
Pseudo-class :if-not() (removed)

CSS 3.0 is not always enough to block ads. To solve this problem AdGuard extends CSS capabilities by adding support for the new pseudo-elements. We have developed a separate open-source library for non-standard element selecting and applying CSS styles with extended properties.

The idea of extended capabilities is an opportunity to match DOM elements with selectors based on their own representation (style, text content, etc.) or relations with other elements. There is also an opportunity to apply styles with non-standard CSS properties.

Application area

Extended selectors can be used in any cosmetic rule, whether they are element hiding rules or CSS rules.

Compatibility

Rules with extended CSS selectors are not supported by AdGuard Content Blocker.

Syntax

Regardless of the CSS pseudo-classes you are using in the rule, you can use special markers to force applying these rules by ExtendedCss. It is recommended to use these markers for all extended CSS cosmetic rules so that it was easier to find them.

The syntax for extended CSS rules:

#?# — for element hiding, #@?# — for exceptions
#$?# — for CSS rules, #@$?# — for exceptions

We strongly recommend using these markers any time when you use an extended CSS selector.

Examples

example.org#?#div:has(> a[target="_blank"][rel="nofollow"]) — this rule blocks all div elements containing a child node that has a link with the attributes [target="_blank"][rel="nofollow"]. The rule applies only to example.org and its subdomains.
example.com#$?#h3:contains(cookies) { display: none!important; } — this rule sets the style display: none!important to all h3 elements that contain the word cookies. The rule applies only to example.com and all its subdomains.
example.net#?#.banner:matches-css(width: 360px) — this rule blocks all .banner elements with the style property width: 360px. The rule applies only to example.net and its subdomains.
example.net#@?#.banner:matches-css(width: 360px) — this rule will disable the previous rule.

You can apply standard CSS selectors using the ExtendedCss library by using the rule marker #?#, e.g. #?#div.banner.

Learn more about how to debug extended selectors.

注意

Some pseudo-classes do not require selector before it. Still adding the universal selector * makes an extended selector easier to read, even though it has no effect on the matching behavior. So selector #block :has(> .inner) works exactly like #block *:has(> .inner), but the second one is more obvious.

Pseudo-class names are case-insensitive, e.g. :HAS() works as :has(). Still the lower-case names are used commonly.

ExtendedCss Limitations

CSS comments and at-rules are not supported.
Specific pseudo-class may have its own limitations: :has(), :xpath(), :nth-ancestor(), :upward(), :is(), :not(), and :remove().

Pseudo-class `:has()`

Draft CSS 4.0 specification describes the :has() pseudo-class. Unfortunately, it is not yet supported by all popular browsers.

注意

Rules with the :has() pseudo-class must use the native implementation of :has() if they use ## marker and if it is possible, i.e. with no other extended selectors inside. To force applying of ExtendedCss rules with :has(), use #?#/#$?# marker explicitly.

Compatibility with other pseudo-classes

Synonyms :-abp-has() is supported by ExtendedCss for better compatibility.

Removal notice

:if() is no longer supported as a synonym for :has().

Syntax

[target]:has(selector)

target — optional, standard or extended CSS selector, can be skipped for checking any element
selector — required, standard or extended CSS selector

The pseudo-class :has() selects the target elements that fit to the selector. Also the selector can start with a combinator.

A selector list can be set in selector as well. In this case all selectors in the list are being matched for now. In the future it will be fixed for <forgiving-relative-selector-list> as argument.

`:has()` limitations

Usage of the :has() pseudo-class is restricted for some cases (2, 3):

disallow :has() inside the pseudos accepting only compound selectors;
disallow :has() after regular pseudo-elements.

Native :has() pseudo-class does not allow :has(), :is(), :where() inside :has() argument to avoid increasing the :has() invalidation complexity (case 1). But ExtendedCss did not have such limitation earlier and filter lists already contain such rules, so we have not added this limitation to ExtendedCss and allow to use :has() inside :has() as it was possible before. To use it, just force ExtendedCss usage by setting #?#/#$?# rule marker.

Native implementation does not allow any usage of :scope inside the :has() argument ([1], [2]). Still, there are some such rules in filter lists: div:has(:scope a) which we continue to support by simply converting them to div:has(> a), as it used to be done previously.

Examples

div:has(.banner) selects all div elements which include an element with the banner class:

<!-- HTML code -->
<div>Not selected</div>
<div>Selected
  <span class="banner">inner element</span>
</div>

div:has(> .banner) selects all div elements which include an banner class element as a direct child of div:

<!-- HTML code -->
<div>Not selected</div>
<div>Selected
  <p class="banner">child element</p>
</div>

div:has(+ .banner) selects all div elements preceding banner class element which immediately follows the div and both are children of the same parent:

<!-- HTML code -->
<div>Not selected</div>
<div>Selected</div>
<p class="banner">adjacent sibling</p>
<span>Not selected</span>

div:has(~ .banner) selects all div elements preceding banner class element which follows the div but not necessarily immediately and both are children of the same parent:

<!-- HTML code -->
<div>Not selected</div>
<div>Selected</div>
<span>Not selected</span>
<p class="banner">general sibling</p>

div:has(span, .banner) selects all div elements which include both span element and banner class element:

<!-- HTML code -->
<div>Not selected</div>
<div>Selected
  <span>child span</span>
  <p class="banner">child .banner</p>
</div>

Old syntax

Backward compatible syntax for :has() is supported but not recommended.

Pseudo-class `:contains()`

The :contains() pseudo-class principle is very simple: it allows to select the elements that contain specified text or which content matches a specified regular expression. Regexp flags are supported.

注意

The :contains() pseudo-class uses the textContent element property for matching, not the innerHTML.

Compatibility with other pseudo-classes

Synonyms :-abp-contains() and :has-text() are supported for better compatibility.

Syntax

[target]:contains(match)

target — optional, standard or extended CSS selector, can be skipped for checking any element
match — required, string or regular expression for matching element textContent. Regular expression flags are supported.

Examples

For such DOM:

<!-- HTML code -->
<div>Not selected</div>
<div id="match">Selected as IT contains "banner"</div>
<div>Not selected <div class="banner"></div></div>

the element div#match can be selected by any of these extended selectors:

! plain text
div:contains(banner)

! regular expression
div:contains(/as .*banner/)

! regular expression with flags
div:contains(/it .*banner/gi)

注意

Only the div with id=match is selected because the next element does not contain any text, and banner is a part of code, not a text.

Old syntax

Backward compatible syntax for :contains() is supported but not recommended.

Pseudo-class `:matches-css()`

The :matches-css() pseudo-class allows to match the element by its current style properties. The work of the pseudo-class is based on using the Window.getComputedStyle() method.

Syntax

[target]:matches-css([pseudo-element, ] property: pattern)

target — optional, standard or extended CSS selector, can be skipped for checking any element
pseudo-element — optional, valid standard pseudo-element, e.g. before, after, first-line, etc.
property — required, a name of CSS property to check the element for
pattern — required, a value pattern that is using the same simple wildcard matching as in the basic URL filtering rules or a regular expression. For this type of matching, AdGuard always does matching in a case-insensitive manner. In the case of a regular expression, the pattern looks like /regexp/.

Special characters escaping and unescaping

For non-regexp patterns (,),[,] must be unescaped, e.g. :matches-css(background-image:url(data:*)).

For regexp patterns \ should be escaped, e.g. :matches-css(background-image: /^url\\("data:image\\/gif;base64.+/).

Examples

For such DOM:

<!-- HTML code -->
<style type="text/css">
    #matched::before {
        content: "Block me"
    }
</style>
<div id="matched"></div>
<div id="not-matched"></div>

the div elements with pseudo-element ::before and with specified content property can be selected by any of these extended selectors:

! string pattern
div:matches-css(before, content: block me)

! string pattern with wildcard
div:matches-css(before, content: block*)

! regular expression pattern
div:matches-css(before, content: /block me/)

Restrictions

Regexp patterns do not support flags.

Compatibility

Obsolete pseudo-classes :matches-css-before() and :matches-css-after() are no longer recommended but still are supported for better compatibility.

Old syntax

Backward compatible syntax for :matches-css() is supported but not recommended.

Pseudo-class `:matches-attr()`

The :matches-attr() pseudo-class allows selecting an element by its attributes, especially if they are randomized.

Syntax

[target]:matches-attr("name"[="value"])

target — optional, standard or extended CSS selector, can be skipped for checking any element
name — required, simple string or string with wildcard or regular expression for attribute name matching
value — optional, simple string or string with wildcard or regular expression for attribute value matching

Escaping special characters

For regexp patterns " and \ should be escaped, e.g. div:matches-attr(class=/[\\w]{5}/).

Examples

div:matches-attr("ad-link") selects the element div#target1:

<!-- HTML code -->
<div id="target1" ad-link="1random23-banner_240x400"></div>

div:matches-attr("data-*"="adBanner") selects the element div#target2:

<!-- HTML code -->
<div id="target2" data-1random23="adBanner"></div>

div:matches-attr(*unit*=/^click$/) selects the element div#target3:

<!-- HTML code -->
<div id="target3" random123-unit094="click"></div>

*:matches-attr("/.{5,}delay$/"="/^[0-9]*$/") selects the element #target4:

<!-- HTML code -->
<div>
  <inner-random23 id="target4" nt4f5be90delay="1000"></inner-random23>
</div>

Restrictions

Regexp patterns do not support flags.

Pseudo-class `:matches-property()`

The :matches-property() pseudo-class allows selecting an element by matching its properties.

Syntax

[target]:matches-property("name"[="value"])

target — optional, standard or extended CSS selector, can be skipped for checking any element
name — required, simple string or string with wildcard or regular expression for element property name matching
value — optional, simple string or string with wildcard or regular expression for element property value matching

Escaping special characters

For regexp patterns " and \ must be escaped, e.g. div:matches-property(prop=/[\\w]{4}/).

注意

Regexp patterns are supported in name for any property in chain, e.g. prop./^unit[\\d]{4}$/.type.

Examples

An element with such properties:

divProperties = {
  id: 1,
  check: {
    track: true,
    unit_2random1: true,
  },
  memoizedProps: {
    key: null,
    tag: 12,
    _owner: {
      effectTag: 1,
      src: 'ad.com',
    },
  },
};

can be selected by any of these extended selectors:

div:matches-property(check.track)

div:matches-property("check./^unit_.{4,8}$/")

div:matches-property("check.unit_*"=true)

div:matches-property(memoizedProps.key="null")

div:matches-property(memoizedProps._owner.src=/ad/)

For filter maintainers

To check properties of a specific element, do the following:

Inspect the page element or select it in Elements tab of browser DevTools
Run console.dir($0) in Console tab

Restrictions

Regexp patterns do not support flags.

Pseudo-class `:xpath()`

The :xpath() pseudo-class allows selecting an element by evaluating an XPath expression.

Syntax

[target]:xpath(expression)

target- optional, standard or extended CSS selector
expression — required, valid XPath expression

`:xpath()` limitations

target can be omitted so it is optional. For any other pseudo-class that would mean "apply to all DOM nodes", but in case of :xpath() it just means "apply to the whole document", and such applying slows elements selecting significantly. That's why rules like #?#:xpath(expression) are limited to looking inside the body tag. For example, rule #?#:xpath(//div[@data-st-area=\'Advert\']) is parsed as #?#body:xpath(//div[@data-st-area=\'Advert\']).

Extended selectors with defined target as any selector — *:xpath(expression) — can still be used but it is not recommended, so target should be specified instead.

Works properly only at the end of selector, except for pseudo-class :remove().

Examples

:xpath(//*[@class="banner"]) selects the element div#target1:

<!-- HTML code -->
<div id="target1" class="banner"></div>

:xpath(//*[@class="inner"]/..) selects the element div#target2:

<!-- HTML code -->
<div id="target2">
  <div class="inner"></div>
</div>

Pseudo-class `:nth-ancestor()`

The :nth-ancestor() pseudo-class allows to lookup the nth ancestor relative to the previously selected element.

subject:nth-ancestor(n)

subject — required, standard or extended CSS selector
n — required, number >= 1 and < 256, distance to the needed ancestor from the element selected by subject

Syntax

subject:nth-ancestor(n)

subject — required, standard or extended CSS selector
n — required, number >= 1 and < 256, distance to the needed ancestor from the element selected by subject

`:nth-ancestor()` limitations

The :nth-ancestor() pseudo-class is not supported inside the argument of the :not() pseudo-class.

Examples

For such DOM:

<!-- HTML code -->
<div id="target1">
  <div class="child"></div>

  <div id="target2">
    <div>
      <div>
        <div class="inner"></div>
      </div>
    </div>
  </div>
</div>

.child:nth-ancestor(1) selects the element div#target1, div[class="inner"]:nth-ancestor(3) selects the element div#target2.

Pseudo-class `:upward()`

The :upward() pseudo-class allows to lookup the ancestor relative to the previously selected element.

Syntax

subject:upward(ancestor)

subject — required, standard or extended CSS selector
ancestor — required, specification for the ancestor of the element selected by subject, can be set as:
- number >= 1 and < 256 for distance to the needed ancestor, same as :nth-ancestor()
- standard CSS selector for matching closest ancestor

`:upward()` limitations

The :upward() pseudo-class is not supported inside the argument of the :not() pseudo-class.

Examples

For such DOM:

<!-- HTML code -->
<div id="target1" data="true">
  <div class="child"></div>

  <div id="target2">
    <div>
      <div>
        <div class="inner"></div>
      </div>
    </div>
  </div>
</div>

.inner:upward(div[data]) selects the element div#target1, .inner:upward(div[id]) selects the element div#target2, .child:upward(1) selects the element div#target1, .inner:upward(3) selects the element div#target2.

Pseudo-class `:remove()` and pseudo-property `remove`

Sometimes, it is necessary to remove a matching element instead of hiding it or applying custom styles. In order to do it, you can use the :remove() pseudo-class as well as the remove pseudo-property.

Pseudo-class :remove() can be placed only at the end of a selector.

Syntax

! pseudo-class
selector:remove()

! pseudo-property
selector { remove: true; }

selector — required, standard or extended CSS selector

`:remove()` and `remove` limitations

The :remove() pseudo-class is limited to work properly only at the end of selector.

For applying the :remove() pseudo-class to any element, the universal selector * should be used. Otherwise such extended selector may be considered as invalid, e.g. .banner > :remove() is not valid for removing any child element of banner class element, so it should look like .banner > *:remove().

If the :remove() pseudo-class or the remove pseudo-property is used, all style properties are ignored except for the debug pseudo-property.

Examples

div.banner:remove()
div:has(> div[ad-attr]):remove()

div:contains(advertisement) { remove: true; }
div[class]:has(> a > img) { remove: true; }

注意

Rules with the remove pseudo-property must use #$?# marker: $ for CSS-style rule syntax, ? for ExtendedCss syntax.

Pseudo-class `:is()`

The :is() pseudo-class allows to match any element that can be selected by any of selectors passed to it. Invalid selectors are skipped and the pseudo-class deals with valid ones with no error thrown. Our implementation of the native :is() pseudo-class.

Syntax

[target]:is(selectors)

target — optional, standard or extended CSS selector, can be skipped for checking any element
selectors — forgiving selector list of standard or extended selectors. For extended selectors, only compound selectors are supported, not complex.

`:is()` limitations

Rules with the :is() pseudo-class must use the native implementation of :is() if rules use ## marker and it is possible, i.e. with no other extended selectors inside. To force applying ExtendedCss rules with :is(), use #?#/#$?# marker explicitly.

If the :is() pseudo-class argument selectors is an extended selector, due to the way how the :is() pseudo-class is implemented in ExtendedCss v2.0, it is impossible to apply it to the top DOM node which is html, i.e. #?#html:is(<extended-selectors>) does not work. So if target is not defined or defined as the universal selector *, the extended pseudo-class applying is limited to html's children, e.g. rules #?#:is(...) and #?#*:is(...) are parsed as #?#html *:is(...). Please note that there is no such limitation for a standard selector argument, i.e. #?#html:is(.locked) works fine.

Complex selectors with extended pseudo-classes are not supported as selectors argument for :is() pseudo-class, only compound ones are allowed. Check examples below for more details.

Examples

#container *:is(.inner, .footer) selects only the element div#target1:

<!-- HTML code -->
<div id="container">
  <div data="true">
    <div>
      <div id="target1" class="inner"></div>
    </div>
  </div>
</div>

Due to limitations :is(*:not([class]) > .banner)' does not work but :is(*:not([class]):has(> .banner)) can be used instead of it to select the element div#target2:

<!-- HTML code -->
<span class="span">text</span>
<div id="target2">
  <p class="banner">inner paragraph</p>
</div>

Pseudo-class `:not()`

The :not() pseudo-class allows to select elements which are not matched by selectors passed as argument. Invalid argument selectors are not allowed and error is to be thrown. Our implementation of the :not() pseudo-class.

Syntax

[target]:not(selectors)

target — optional, standard or extended CSS selector, can be skipped for checking any element
selectors — list of standard or extended selectors

`:not()` limitations

Rules with the :not() pseudo-class must use the native implementation of :not() if rules use ## marker and it is possible, i.e. with no other extended selectors inside. To force applying ExtendedCss rules with :not(), use #?#/#$?# marker explicitly.

If the :not() pseudo-class argument selectors is an extended selector, due to the way how the :not() pseudo-class is implemented in ExtendedCss v2.0, it is impossible to apply it to the top DOM node which is html, i.e. #?#html:not(<extended-selectors>) does not work. So if target is not defined or defined as the universal selector *, the extended pseudo-class applying is limited to html's children, e.g. rules #?#:not(...) and #?#*:not(...) are parsed as #?#html *:not(...). Please note that there is no such limitation for a standard selector argument, i.e. #?#html:not(.locked) works fine.

The :not() is considered as a standard CSS pseudo-class inside the argument of the :upward() pseudo-class because :upward() supports only standard selectors.

"Up-looking" pseudo-classes which are :nth-ancestor() and :upward() are not supported inside selectors argument for :not() pseudo-class.

Examples

#container > *:not(h2, .text) selects only the element div#target1:

<!-- HTML code -->
<div id="container">
  <h2>Header</h2>
  <div id="target1"></div>
  <span class="text">text</span>
</div>

Pseudo-class `:if-not()` (removed)

Removal notice

The :if-not() pseudo-class is removed and is no longer supported. Rules with it are considered as invalid.

This pseudo-class was basically a shortcut for :not(:has()). It was supported by ExtendedCss for better compatibility with some filters subscriptions.

Cosmetic rules priority

The way element hiding and CSS rules are applied is platform-specific.

In AdGuard for Windows, Mac, and Android, we use a stylesheet injected into the page. The priority of cosmetic rules is the same as any other websites' CSS stylesheet. But there is a limitation: element hiding and CSS rules cannot override inline styles. In such cases, it is recommended to use extended selectors or HTML filtering.

In AdGuard Browser Extension, the so called "user stylesheets" are used. They have higher priority than even the inline styles.

Extended CSS selectors use JavaScript to work and basically add an inline style themselves, therefore they can override any style.

HTML filtering rules

In most cases, the basis and cosmetic rules are enough to filter ads. But sometimes it is necessary to change the HTML-code of the page itself before it is loaded. This is when you need filtering rules for HTML content. They allow to indicate the HTML elements to be cut out before the browser loads the page.

Compatibility

HTML filtering rules are supported by AdGuard for Windows, AdGuard for Mac, AdGuard for Android, and AdGuard Browser Extension for Firefox. Such rules do not work in extensions for other browsers because they are unable to modify content on network level.

Syntax

     selector = [tagName] [attributes] [pseudoClasses]
   combinator = ">"
         rule = [domains] "$$" selector *(combinator selector)
      domains = [domain0, domain1[, ...[, domainN]]]
   attributes = "[" name0 = value0 "]" "[" name1 = value2 "]" ... "[" nameN = valueN "]"
pseudoClasses = pseudoClass *pseudoClass
  pseudoClass = ":" pseudoName [ "(" pseudoArgs ")" ]

tagName — name of the element in lower case, for example, div or script.
domains — domain restriction for the rule. Same principles as in element hiding rule syntax.
attributes — a list of attributes that limit the selection of elements. name — attribute name, value — substring, that is contained in attribute value.
pseudoName — the name of a pseudo-class.
pseudoArgs — the arguments of a function-style pseudo-class.
combinator — an operator that works similarly to the CSS child combinator: that is, the selector on the right of the combinator will only match an element whose direct parent matches the selector on the left of the combinator.

Examples

HTML code:

<script data-src="/banner.js"></script>

Rule:

example.org$$script[data-src="banner"]

This rule removes all script elements with the attribute data-src containing the substring banner. The rule applies only to example.org and all its subdomains.

Special attributes

In addition to usual attributes, which value is every element checked for, there is a set of special attributes that change the way a rule works. Below there is a list of these attributes:

`tag-content`

Deprecation notice

This special attribute may become unsupported in the future. Prefer using the :contains() pseudo-class where it is available.

This is the most frequently used special attribute. It limits selection with those elements whose innerHTML code contains the specified substring.

You must use "" to escape ", for instance: $$script[tag-content="alert(""this is ad"")"]

For example, take a look at this HTML code:

<script type="text/javascript">
    document.write('<div>banner text</div>" />');
</script>

Following rule will delete all script elements with a banner substring in their code:

$$script[tag-content="banner"]

Limitations

The tag-content special attribute must not appear in a selector to the left of a > combinator.

`wildcard`

Deprecation notice

This special attribute may become unsupported in the future. Prefer using the :contains() pseudo-class where it is available.

This special attribute works almost like tag-content and allows you to check the innerHTML code of the document. Rule will check if HTML code of the element fits to the search pattern.

You must use "" to escape ", for instance: $$script[wildcard=""banner""]

For example: $$script[wildcard="*banner*text*"]

It checks if the element code contains the two consecutive substrings banner and text.

Limitations

The wildcard special attribute must not appear in a selector to the left of a > combinator.

`max-length`

Deprecation notice

This special attribute may become unsupported in the future. Prefer using the :contains() pseudo-class with a regular expression where it is available.

Specifies the maximum length for content of HTML element. If this parameter is set and the content length exceeds the value, a rule does not apply to the element.

Default value

If this parameter is not specified, the max-length is considered to be 8192.

For example:

$$div[tag-content="banner"][max-length="400"]

This rule will remove all the div elements, whose code contains the substring banner and the length of which does not exceed 400 characters.

Limitations

The max-length special attribute must not appear in a selector to the left of a > combinator.

`min-length`

Deprecation notice

This special attribute may become unsupported in the future. Prefer using the :contains() pseudo-class with a regular expression where it is available.

Specifies the minimum length for content of HTML element. If this parameter is set and the content length is less than preset value, a rule does not apply to the element.

For example:

$$div[tag-content="banner"][min-length="400"]

This rule will remove all the div elements, whose code contains the substring banner and the length of which exceeds 400 characters.

Limitations

The min-length special attribute must not appear in a selector to the left of a > combinator.

Pseudo-classes

`:contains()`

Syntax

:contains(unquoted text)

或者

:contains(/reg(ular )?ex(pression)?/)

Compatibility

:-abp-contains() and :has-text() are synonyms for :contains().

Compatibility

The :contains() pseudo-class is supported by AdGuard for Windows, Mac, and Android with CoreLibs v1.13 or later.

Requires that the inner HTML of the element contains the specified text or matches the specified regular expression.

Limitations

A :contains() pseudo-class must not appear in a selector to the left of a > combinator.

Exceptions

Similar to hiding rules, there is a special type of rules that disable the selected HTML filtering rule for particular domains. The syntax is the same, you just have to change $$ to $@$ .

For example, there is a rule in filter:

$$script[tag-content="banner"]

If you want to disable it for example.com, you can create an exception rule:

example.com$@$script[tag-content="banner"]

Sometimes, it may be necessary to disable all restriction rules. For example, to conduct tests. To do this, use the exclusion rule without specifying a domain.

$@$script[tag-content="banner"]

We recommend to use this kind of exceptions only if it is not possible to change the hiding rule itself. In other cases it is better to change the original rule, using domain restrictions.

JavaScript rules

AdGuard supports a special type of rules that allows you to inject any JavaScript code to websites pages.

We strongly recommend using scriptlets instead of JavaScript rules whenever possible. JS rules are supposed to help with debugging, but as a long-time solution a scriptlet rule should be used.

Syntax

rule = [domains] "#%#" script

domains — domain restriction for the rule. Same principles as in element hiding rules.
script — arbitrary JavaScript code in one string.

Examples

example.org#%#window.__gaq = undefined; executes the code window.__gaq = undefined; on all pages at example.org and all subdomains.

Exceptions

Similar to hiding rules, there is a special type of rules that disable the selected javascript rule for particular domains. The syntax is the same, you just have to change #%# to #@%#.

For example, there is a rule in filter:

#%#window.__gaq = undefined;

If you want to disable it for example.com, you can create an exception rule:

example.com#@%#window.__gaq = undefined;

Sometimes, it may be necessary to disable all restriction rules. For example, to conduct tests. To do this, use the exclusion rule without specifying a domain.

#@%#window.__gaq = undefined;

We recommend to use this kind of exceptions only if it is not possible to change the hiding rule itself. In other cases it is better to change the original rule, using domain restrictions.

Restrictions

JavaScript rules can only be used in trusted filters.

Compatibility

JavaScript rules are not supported by AdGuard Content Blocker.

Scriptlet rules

Scriptlet is a JavaScript function that provides extended capabilities for content blocking. These functions can be used in a declarative manner in AdGuard filtering rules.

注意

AdGuard supports a lot of different scriptlets. In order to achieve cross-blocker compatibility, we also support syntax of uBO and ABP.

Blocking rules syntax

[domains]#%#//scriptlet(name[, arguments])

domains — optional, a list of domains where the rule should be applied;
name — required, a name of the scriptlet from AdGuard Scriptlets library;
arguments — optional, a list of string arguments (no other types of arguments are supported).

Examples

Apply the abort-on-property-read scriptlet on all pages of example.org and its subdomains, and pass it an alert argument:
```
example.org#%#//scriptlet('abort-on-property-read', 'alert')
```
Remove the branding class from all div[class^="inner"] elements on all pages of example.org and its subdomains:
```
example.org#%#//scriptlet('remove-class', 'branding', 'div[class^="inner"]')
```

Exception rules syntax

Exception rules can disable some scriptlets on particular domains. The syntax for exception scriptlet rules is similar to normal scriptlet rules but uses #@%# instead of #%#:

[domains]#@%#//scriptlet([name[, arguments]])

domains — optional, a list of domains where the rule should be applied;
name — optional, a name of the scriptlet to except from the applying; if not set, all scriptlets will not be applied;
arguments — optional, a list of string arguments to match the same blocking rule and disable it.

Examples

Disable specific scriptlet rule so that only abort-on-property-read is applied only on example.org and its subdomains:

example.org,example.com#%#//scriptlet("abort-on-property-read", "alert")
example.com#@%#//scriptlet("abort-on-property-read", "alert")

Disable all abort-on-property-read scriptlets for example.com and its subdomains:

example.org,example.com#%#//scriptlet("abort-on-property-read", "alert")
example.com#@%#//scriptlet("abort-on-property-read")

Disable all scriptlets for example.com and its subdomains:

example.org,example.com#%#//scriptlet("abort-on-property-read", "alert")
example.com#@%#//scriptlet()

Apply set-constant and set-cookie to any web page, but due to special scriptlet exception rule only the set-constant scriptlet will be applied on example.org and its subdomains:
```
#%#//scriptlet('set-constant', 'adList', 'emptyArr')
#%#//scriptlet('set-cookie', 'accepted', 'true')
example.org#@%#//scriptlet('set-cookie')
```
Apply adjust-setInterval to any web page and set-local-storage-item on example.com and its subdomains, but there are also multiple scriptlet exception rules, so no scriptlet rules will be applied on example.com and its subdomains:
```
#%#//scriptlet('adjust-setInterval', 'count', '*', '0.001')
example.com#%#//scriptlet('set-local-storage-item', 'ALLOW_COOKIES', 'false')
example.com#@%#//scriptlet()
```

Learn more about how to debug scriptlets.

More information about scriptlets can be found on GitHub.

Compatibility

Scriptlet rules are not supported by AdGuard Content Blocker.

The full syntax of scriptlet exception rules is supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.16 or later, and AdGuard Browser Extension for Chrome, Firefox, and Edge with TSUrlFilter v3.0 or later. Previous versions only support exception rules that disable specific scriptlets.

Trusted scriptlets

Trusted scriptlets are scriptlets with extended functionality. It means the same syntax and restrictions. Trusted scriptlet names are prefixed with trusted-, e.g. trusted-set-cookie, to be easily distinguished from common scriptlets.

注意

Trusted scriptlets are not compatible with other ad blockers except AdGuard.

Restrictions

Trusted scriptlets rules can only be used in trusted filters.

Compatibility

Trusted scriptlets rules are not supported by AdGuard Content Blocker.

Learn more about how to debug scriptlets.

More information about trusted scriptlets can be found on GitHub.

Modifiers for non-basic type of rules

Each rule can be modified using the modifiers described in the following paragraphs.

Syntax {#non-basic-rules-modifiers-syntax}

rule = "[$" modifiers "]" [rule text]
modifiers = modifier0[, modifier1[, ...[, modifierN]]]

modifier — set of the modifiers described below.
rule text — a rule to be modified.

For example, [$domain=example.com,app=test_app]##selector.

In the modifiers values, the following characters must be escaped: [, ], ,, and \ (unless it is used for the escaping). Use \ to escape them. For example, an escaped bracket looks like this: \].

Modifier \ Products	CoreLibs apps	AdGuard for Chromium	AdGuard for Chrome MV3	AdGuard for Firefox	AdGuard iOS版	AdGuard Safari版	AdGuard 内容拦截器
$app	✅	❌	❌	❌	❌	❌	❌
$domain	✅	✅	✅ *[1]	✅	✅	✅	❌
$path	✅	✅	❌	✅	✅	✅	❌
$url	✅	✅ *[2]	✅ *[2]	✅ *[2]	❌	❌	❌

注意

✅ — fully supported
✅ * — supported, but reliability may vary or limitations may occur; check the modifier description for more details
❌ — not supported

`$app`

$app modifier lets you narrow the rule coverage down to a specific application or a list of applications. The modifier's behavior and syntax perfectly match the corresponding basic rules $app modifier.

Examples

[$app=org.example.app]example.com##.textad hides a div with the class textad at example.com and all subdomains in requests sent from the org.example.app Android app.
[$app=~org.example.app1|~org.example.app2]example.com##.textad hides a div with the class textad at example.com and all subdomains in requests sent from any app except org.example.app1 and org.example.app2.
[$app=com.apple.Safari]example.org#%#//scriptlet('prevent-setInterval', 'check', '!300') applies scriptlet prevent-setInterval only in Safari browser on Mac.
[$app=org.example.app]#@#.textad disables all ##.textad rules for all domains while using org.example.app.

Compatibility

Such rules with $app modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android.

`$domain`

$domain modifier limits the rule application area to a list of domains and their subdomains. The modifier's behavior and syntax perfectly match the corresponding basic rules $domain modifier.

Examples

[$domain=example.com]##.textad — hides a div with the class textad at example.com and all subdomains.
[$domain=example.com|example.org]###adblock — hides an element with attribute id equals adblock at example.com, example.org and all subdomains.
[$domain=~example.com]##.textad — this rule hides div elements of the class textad for all domains, except example.com and its subdomains.

There are 2 ways to specify domain restrictions for non-basic rules:

the "classic" way is to specify domains before rule mask and attributes: example.com##.textad;
the modifier approach is to specify domains via $domain modifier: [$domain=example.com]##.textad.

But rules with mixed style domains restriction are considered invalid. So, for example, the rule [$domain=example.org]example.com##.textad will be ignored.

Non-basic `$domain` modifier limitations

Limitations

Since the non-basic $domain works the same as the basic one, it has the same limitations.

Compatibility

Such rules with $domain modifier are supported by AdGuard for Windows, AdGuard for Mac, AdGuard for Android, AdGuard Browser Extension for Chrome, for Chrome MV3, Firefox, and Edge.

`$path`

$path modifier limits the rule application area to specific locations or pages on websites.

Syntax

$path ["=" pattern]

pattern — optional, a path mask to which the rule is restricted. Its syntax and behavior are pretty much the same as with the pattern for basic rules. You can also use special characters, except for ||, which does not make any sense in this case (see examples below).

If pattern is not set for $path, rule will apply only on the main page of website.

$path modifier matches the query string as well.

$path modifier supports regular expressions in the same way basic rules do.

Examples

[$path=page.html]##.textad hides a div with the class textad at /page.html or /page.html?<query> or /sub/page.html or /another_page.html
[$path=/page.html]##.textad hides a div with the class textad at /page.html or /page.html?<query> or /sub/page.html of any domain but not at /another_page.html
[$path=|/page.html]##.textad hides a div with the class textad at /page.html or /page.html?<query> of any domain but not at /sub/page.html
[$path=/page.html|]##.textad hides a div with the class textad at /page.html or /sub/page.html of any domain but not at /page.html?<query>
[$path=/page*.html]example.com##.textad hides a div with the class textad at /page1.html or /page2.html or any other path matching /page<...>.html of example.com
[$path]example.com##.textad hides a div with the class textad at the main page of example.com
[$domain=example.com,path=/page.html]##.textad hides a div with the class textad at page.html of example.com and all subdomains but not at another_page.html
[$path=/\\/(sub1|sub2)\\/page\\.html/]##.textad hides a div with the class textad at both /sub1/page.html and /sub2/page.html of any domain (please note the escaped special characters)

Compatibility

Rules with $path modifier are not supported by AdGuard Content Blocker.

`$url`

$url modifier limits the rule application area to URLs matching the specified mask.

Syntax

url = pattern

where pattern is pretty much the same as pattern of the basic rules assuming that some characters must be escaped. The special characters and regular expressions are supported as well.

Examples

[$url=||example.com/content/*]##div.textad hides a div with the class textad at addresses like https://example.com/content/article.html and even https://subdomain.example.com/content/article.html.
[$url=||example.org^]###adblock hides an element with attribute id equal to adblock at example.org and its subdomains.
[$url=/\[a-z\]+\\.example\\.com^/]##.textad hides div elements of the class textad for all domains matching the regular expression [a-z]+\.example\.com^.

`$url` modifier limitations

Limitations

In AdGuard Browser Extension, non-basic $url modifier is not compatible with domain-specific rules and other non-basic modifiers — $domain and $path. For example, the rule [$url=/category/*]example.com###textad will not be applied.

Compatibility

Rules with the $url modifier are supported by AdGuard for Windows, AdGuard for Mac, and AdGuard for Android with CoreLibs v1.11 or later, and AdGuard Browser Extension with TSUrlFilter v3.0.0 or later.

Information for filter maintainers

If you maintain a third-party filter that is known to AdGuard, you might be interested in the information presented in this section. Please note that hints will be applied to registered filters only. The filter is considered to be registered and known by AdGuard, if it is present in the known filters index. If you want your filter to be registered, please file an issue to AdguardFilters repo.

Preprocessor directives

We provide preprocessor directives that can be used by filter maintainers to improve compatibility with different ad blockers and provide:

including a file
applying rules conditionally by ad blocker type
content blocker specifying for rules applying in Safari

注意

Any mistake in a preprocessor directive will lead to AdGuard failing the filter update in the same way as if the filter URL was unavailable.

Preprocessor directives can be used in the user rules or in the custom filters.

Including a file

The !#include directive allows to include contents of a specified file into the filter. It supports only files from the same origin to make sure that the filter maintainer is in control of the specified file. The included file can also contain pre-directives (even other !#include directives). Ad blockers should consider the case of recursive !#include and implement a protection mechanism.

Syntax

!#include file_path

where file_path is a same origin absolute or relative file path to be included.

The files must originate from the same domain, but may be located in a different folder.

If included file is not found or unavailable, the whole filter update should fail.

Same-origin limitation should be disabled for local custom filters.

Examples

Filter URL: https://example.org/path/filter.txt

! Valid (same origin):
!#include https://example.org/path/includedfile.txt
!
! Valid (relative path):
!#include /includedfile.txt
!#include ../path2/includedfile.txt
!
! Invalid (another origin):
!#include https://domain.com/path/includedfile.txt

Conditions

Filter maintainers can use conditions to supply different rules depending on the ad blocker type. A conditional directive beginning with an !#if directive must explicitly be terminated with an !#endif directive. Conditions support all basic logical operators.

There are two possible scenarios:

When an ad blocker encounters an !#if directive and no !#else directive, it will compile the code between !#if and !#endif directives only if the specified condition is true.
If there is an !#else directive, the code between !#if and !#else will be compiled if the condition is true; otherwise, the code between !#else and !#endif will be compiled.

注意

Whitespaces matter. !#if is a valid directive, while !# if is not.

Syntax

!#if (conditions)
rules_list
!#endif

或者

!#if (conditions)
true_conditions_rules_list
!#else
false_conditions_rules_list
!#endif

where:

!#if (conditions) — start of the block when conditions are true
conditions — just like in some popular programming languages, preprocessor conditions are based on constants declared by ad blockers. Authors of ad blockers define on their own what exact constants they declare. Possible values:
- adguard always declared; shows maintainers that this is one of AdGuard products; should be enough in 95% of cases
- product-specific constants for cases when you need a rule to work (or not work — then ! should be used before constant) in a specific product only:
  - adguard_app_windows — AdGuard for Windows
  - adguard_app_mac — AdGuard for Mac
  - adguard_app_android — AdGuard for Android
  - adguard_app_ios — AdGuard for iOS
  - adguard_ext_safari — AdGuard for Safari
  - adguard_ext_chromium — AdGuard Browser Extension for Chrome (and chromium-based browsers, e.g. new Microsoft Edge)
  - adguard_ext_chromium_mv3 — AdGuard for Chrome MV3
  - adguard_ext_firefox — AdGuard Browser Extension for Firefox
  - adguard_ext_edge — AdGuard Browser Extension for Edge Legacy
  - adguard_ext_opera — AdGuard Browser Extension for Opera
  - adguard_ext_android_cb — AdGuard Content Blocker for mobile Samsung and Yandex browsers
  - ext_ublock — special case; this one is declared when a uBlock version of a filter is compiled by the FiltersRegistry
  - cap_html_filtering — products that support HTML filtering rules: AdGuard for Windows, AdGuard for Mac, and AdGuard for Android
!#else — start of the block when conditions are false
rules_list, true_conditions_rules_list, false_conditions_rules_list — lists of rules
!#endif — end of the block

Examples

! for all AdGuard products except AdGuard for Safari
!#if (adguard && !adguard_ext_safari)
||example.org^$third-party
domain.com##div.ad
!#endif

! directives even can be combined
!#if (adguard_app_android)
!#include /androidspecific.txt
!#endif

!#if (adguard && !adguard_ext_safari)
! for all AdGuard products except AdGuard for Safari
||example.org^$third-party
domain.com##div.ad
!#else
! for AdGuard for Safari only
||subdomain.example.org^$third-party
!#endif

Compatibility

The !#else directive is supported by the FiltersDownloader v1.1.20 or later.

It is already supported for filter lists compiled by the FiltersRegistry, but it still may not be supported by AdGuard products when adding a filter list with !#else as a custom one. The following products will support it in the mentioned versions or later:

AdGuard for Windows, Mac, and Android with CoreLibs v1.13;
AdGuard Browser Extension v4.2.208;
AdGuard v1.11.16 for Safari.

Safari affinity

Safari's limit for each content blocker is 150,000 active rules. But in AdGuard for Safari and AdGuard for iOS, we've split the rules into 6 content blockers, thus increasing the rule limit to 900,000.

Here is the composition of each content blocker:

AdGuard General — Ad Blocking, Language-specific
AdGuard Privacy — Privacy
AdGuard Social — Social Widgets, Annoyances
AdGuard Security — Security
AdGuard Other — Other
AdGuard Custom — Custom

User rules and allowlist are added to every content blocker.

警告

The main disadvantage of using multiple content blockers is that rules from different blockers are applied independently. Blocking rules are not affected by this, but unblocking rules may cause problems. If a blocking rule is in one content blocker and an exception is in another, the exception will not work. Filter maintainers use !#safari_cb_affinity to define Safari content blocker affinity for the rules inside of the directive block.

Syntax

!#safari_cb_affinity(content_blockers)
rules_list
!#safari_cb_affinity

where:

!#safari_cb_affinity(content_blockers) — start of the block
content_blockers — comma-separated list of content blockers. Possible values:
- general — AdGuard General content blocker
- privacy — AdGuard Privacy content blocker
- social — AdGuard Social content blocker
- security — AdGuard Security content blocker
- other — AdGuard Other content blocker
- custom — AdGuard Custom content blocker
- all — special keyword that means that the rules must be included into all content blockers
rules_list — list of rules
!#safari_cb_affinity — end of the block

Examples

! to unhide specific element which is hidden by AdGuard Base filter:
!#safari_cb_affinity(general)
example.org#@#.adBanner
!#safari_cb_affinity

! to allowlist basic rule from AdGuard Tracking Protection filter:
!#safari_cb_affinity(privacy)
@@||example.org^
!#safari_cb_affinity

Hints

"Hint" is a special comment, instruction to the filters compiler used on the server side (see FiltersRegistry).

Syntax

!+ HINT_NAME1(PARAMS) HINT_NAME2(PARAMS)

Multiple hints can be applied.

`NOT_OPTIMIZED` hint

For each filter, AdGuard compiles two versions: full and optimized. Optimized version is much more lightweight and does not contain rules which are not used at all or used rarely.

Rules usage frequency comes from the collected filter rules statistics. But filters optimization is based on more than that — some filters have specific configuration. This is how it looks like for Base filter:

"filter": AdGuard Base filter,
"percent": 30,
"minPercent": 20,
"maxPercent": 40,
"strict": true

where:

filter — filter identifier
percent — expected optimization percent ~= (rules count in optimized filter) / (rules count in original filter) * 100
minPercent — lower bound of percent value
maxPercent — upper bound of percent value
strict — if percent < minPercent OR percent > maxPercent and strict mode is on then filter compilation should fail, otherwise original rules must be used

In other words, percent is the "compression level". For instance, for the Base filter it is configured to 40%. It means that optimization algorithm should strip 60% of rules.

Eventually, here are the two versions of the Base filter for AdGuard Browser Extension:

If you want to add a rule which should not be removed at optimization use the NOT_OPTIMIZED hint:

!+ NOT_OPTIMIZED
||example.org^

And this rule will not be optimized only for AdGuard for Android:

!+ NOT_OPTIMIZED PLATFORM(android)
||example.org^

`PLATFORM` and `NOT_PLATFORM` hints

Used to specify the platforms to apply the rules. List of existing platforms and links to Base filter, for example, for each of them:

windows — AdGuard for Windows — https://filters.adtidy.org/windows/filters/2.txt
mac — AdGuard for Mac — https://filters.adtidy.org/mac_v2/filters/2.txt
android — AdGuard for Android — https://filters.adtidy.org/android/filters/2.txt
ios — AdGuard for iOS — https://filters.adtidy.org/ios/filters/2.txt
ext_chromium — AdGuard Browser Extension for Chrome — https://filters.adtidy.org/extension/chromium/filters/2.txt
ext_chromium_mv3 — AdGuard Browser Extension for Chrome MV3 — https://filters.adtidy.org/extension/chromium-mv3/filters/2.txt
ext_ff — AdGuard Browser Extension for Firefox — https://filters.adtidy.org/extension/firefox/filters/2.txt
ext_edge — AdGuard Browser Extension for Edge — https://filters.adtidy.org/extension/edge/filters/2.txt
ext_opera — AdGuard Browser Extension for Opera — https://filters.adtidy.org/extension/opera/filters/2.txt
ext_safari — AdGuard for Safari — https://filters.adtidy.org/extension/safari/filters/2.txt
ext_android_cb — AdGuard Content Blocker — https://filters.adtidy.org/extension/android-content-blocker/filters/2.txt
ext_ublock — uBlock Origin — https://filters.adtidy.org/extension/ublock/filters/2.txt

Examples

This rule will be available only in AdGuard for Windows, Mac, Android:

!+ PLATFORM(windows,mac,android)
||example.org^

Except for AdGuard for Safari, AdGuard Content Blocker, and AdGuard for iOS, this rule is available on all platforms:

!+ NOT_PLATFORM(ext_safari, ext_android_cb, ios)
||example.org^

How to debug filtering rules

It may be possible to create simple filtering rules "in your head" but for anything even slightly more complicated you will need additional tools to debug and iterate them. There are tools to assist you with that. You can use DevTools in Chrome and its analogs in other browsers but most AdGuard products provide another one — Filtering log.

Filtering log

Filtering log is an advanced tool that will be helpful mostly to filter developers. It lists all web requests that pass through AdGuard, gives you exhaustive information on each of them, offers multiple sorting options, and has other useful features.

Depending on which AdGuard product you are using, Filtering log can be located in different places.

In AdGuard for Windows, you can find it in the Ad Blocker tab or via the tray menu
In AdGuard for Mac, it is located in Settings → Advanced → Filtering log
In AdGuard for Android, you can find it under Statistics → Recent activity. Recent activity can also be accessed from the Assistant
In AdGuard Browser Extension, it is accessible from the Miscellaneous settings tab or by right-clicking the extension icon. Only Chromium- and Firefox-based web browsers show applied element hiding rules (including CSS, ExtCSS) and JS rules and scriptlets in their Filtering logs

注意

In AdGuard for iOS and AdGuard for Safari, Filtering log does not exist because of the way content blockers are implemented in Safari. AdGuard does not see the web requests and therefore cannot display them.

Selectors debugging mode

Sometimes, you might need to check the performance of a given selector or a stylesheet. In order to do it without interacting with JavaScript directly, you can use a special debug style property. When ExtendedCss meets this property, it enables the debugging mode either for a single selector or for all selectors, depending on the debug value.

Open the browser console while on a web page to see the timing statistics for selector(s) that were applied there. Debugging mode displays the following stats as object where each of the debugged selectors are keys, and value is an object with such properties:

Always printed:

selectorParsed — text of the parsed selector, may differ from the input one
timings — list of DOM nodes matched by the selector
- appliesCount — total number of times that the selector has been applied on the page
- appliesTimings — time that it took to apply the selector on the page, for each of the instances that it has been applied (in milliseconds)
- meanTiming — mean time that it took to apply the selector on the page
- standardDeviation — standard deviation
- timingsSum — total time it took to apply the selector on the page across all instances

Printed only for remove pseudos:

removed — flag to signal if elements were removed

Printed if elements are not removed:

matchedElements — list of DOM nodes matched by the selector
styleApplied — parsed rule style declaration related to the selector

Examples

Debugging a single selector:

When the value of the debug property is true, only information about this selector will be shown in the browser console.

#$?#.banner { display: none; debug: true; }

Enabling global debug:

When the value of the debug property is global, the console will display information about all extended CSS selectors that have matches on the current page, for all the rules from any of the enabled filters.

#$?#.banner { display: none; debug: global; }

Testing extended selectors without AdGuard

ExtendedCss can be executed on any page without using any AdGuard product. In order to do that you should copy and execute the following code in a browser console:

!function(e,t,d){C=e.createElement(t),C.src=d,C.onload=function(){alert("ExtendedCss loaded successfully")},s=e.getElementsByTagName(t)[0],s?s.parentNode.insertBefore(C,s):(h=e.getElementsByTagName("head")[0],h.appendChild(C))}(document,"script","https://AdguardTeam.github.io/ExtendedCss/extended-css.min.js");

Alternatively, install the ExtendedCssDebugger userscript.

Now you can now use the ExtendedCss from global scope, and run its method query() as Document.querySelectorAll().

Examples

const selector = 'div.block:has=(.header:matches-css(after, content: Ads))';

// array of HTMLElements matched the `selector` is to be returned
ExtendedCss.query(selector);

Debugging scriptlets

If you are using AdGuard Browser Extension and want to debug a scriptlet or a trusted scriptlet rule, you can get additional information by opening the Filtering log. In that case, scriptlets will switch to debug mode and there will be more information in the browser console.

The following scriptlets are especially developed for debug purposes:

The following scriptlets also may be used for debug purposes:

json-prune
prevent-fetch
prevent-requestAnimationFrame
prevent-setInterval
prevent-setTimeout
prevent-window-open with specified replacement parameter
prevent-xhr
trusted-replace-fetch-response
trusted-replace-xhr-response

Compatibility tables legend

Product shortcuts

CoreLibs apps — AdGuard for Windows, AdGuard for Mac, and AdGuard for Android
AdGuard for Chromium — AdGuard Browser Extension for Chrome and other Chromium-based browsers such as Microsoft Edge, Opera
AdGuard for Chrome MV3 — AdGuard Browser Extension for Chrome MV3
AdGuard for Firefox — AdGuard Browser Extension for Firefox
AdGuard for iOS — AdGuard for iOS and AdGuard Pro for iOS (for mobile Safari browser)
AdGuard for Safari — AdGuard for desktop Safari browser
AdGuard Content Blocker — Content Blocker for Android mobile browsers: Samsung Internet and Yandex Browser

Compatibility shortcuts

注意

✅ — fully supported
✅ * — supported, but reliability may vary or limitations may occur; check the modifier description for more details
🧩 — may already be implemented in nightly or beta versions but is not yet supported in release versions
⏳ — feature that is planned to be implemented but is not yet available in any product
❌ — not supported
👎 — deprecated; still supported but will be removed in the future
🚫 — removed and no longer supported

Comments
Examples
Restrictions and limitations
- Trusted filters
- AdGuard 内容拦截器
Basic rules
Non-basic rules
Cosmetic rules
HTML filtering rules
JavaScript rules
Scriptlet rules
- Trusted scriptlets
Modifiers for non-basic type of rules
Information for filter maintainers
- Preprocessor directives
- Hints
  - NOT_OPTIMIZED hint
  - PLATFORM and NOT_PLATFORM hints
How to debug filtering rules
Compatibility tables legend
- Product shortcuts
- Compatibility shortcuts

Comments​

Examples​ 示例

Blocking by domain name​

Blocking exact address​

Basic rule modifiers​

Unblocking an address​

Unblocking an entire website​解锁整个网站

Cosmetic rule​

Restrictions and limitations​限制和限制

Trusted filters​值得信赖的过滤器

AdGuard 内容拦截器​

Basic rules​

Basic rule syntax​

Special characters​特殊字符

Regular expressions support​正则表达式支持

Wildcard support for TLD (top-level domains)​TLD（顶级域名）的通配符支持

Basic rule examples​基本规则示例

Basic rule modifiers​

Basic modifiers​

$app​

$denyallow​

$domain​

$domain modifier limitations​

$header​

$header modifier limitations​

$important​

$match-case​

$method​

$popup​

$popup modifier limitations​

$strict-first-party​

$strict-third-party​

$third-party​

$to​

Content-type modifiers​

$document​

$font​

$image​

$media​

$object​

$other​

$ping​

$ping modifier limitations​

$script​

$stylesheet​

$subdocument​

$subdocument modified limitations​

$websocket​

$websocket modifier limitations​

$xmlhttprequest​

$object-subrequest (removed)​

$webrtc (removed)​

Exception rules modifiers​

$content​

$elemhide​

$extension​

$jsinject​

$jsinject modifier limitations​

$stealth​

$urlblock​

$urlblock modifier limitations​

Generic rules​

$genericblock​

$genericblock modifier limitations​

$generichide​

specifichide​

Advanced capabilities​

$all​

$all modifier limitations​

$badfilter​

$badfilter modifier limitations​

$cookie​

$cookie modifier limitations​

$csp​

$hls​

$inline-script​

$inline-font​

$jsonprune​

$xmlprune​

$network​

Comments

Examples 示例

Blocking by domain name

Blocking exact address

Basic rule modifiers

Unblocking an address

Unblocking an entire website
解锁整个网站

Cosmetic rule

Restrictions and limitations
限制和限制

Trusted filters
值得信赖的过滤器

AdGuard 内容拦截器

Basic rules

Basic rule syntax

Special characters
特殊字符

Regular expressions support
正则表达式支持

Wildcard support for TLD (top-level domains)
TLD（顶级域名）的通配符支持

Basic rule examples
基本规则示例

Basic rule modifiers

Basic modifiers

`$app`

`$denyallow`

`$domain`

`$domain` modifier limitations

`$header`

`$header` modifier limitations

`$important`

`$match-case`

`$method`

`$popup`

`$popup` modifier limitations

`$strict-first-party`

`$strict-third-party`

`$third-party`

`$to`

Content-type modifiers

`$document`

`$font`

`$image`

`$media`

`$object`

`$other`

`$ping`

`$ping` modifier limitations

`$script`

`$stylesheet`

`$subdocument`

`$subdocument` modified limitations

`$websocket`

`$websocket` modifier limitations

`$xmlhttprequest`

`$object-subrequest` (removed)

`$webrtc` (removed)

Exception rules modifiers

`$content`

`$elemhide`

`$extension`

`$jsinject`

`$jsinject` modifier limitations

`$stealth`

`$urlblock`

`$urlblock` modifier limitations

Generic rules

`$genericblock`

`$genericblock` modifier limitations

`$generichide`

`specifichide`

Advanced capabilities

`$all`

`$all` modifier limitations

`$badfilter`

`$badfilter` modifier limitations

`$cookie`

`$cookie` modifier limitations

`$csp`

`$hls`

`$inline-script`

`$inline-font`

`$jsonprune`

`$xmlprune`

`$network`