:has()
:if-not()
:contains()
:matches-css()
:matches-attr()
:matches-property()
:xpath()
:nth-ancestor()
:upward()
remove
A filter is a set of filtering rules applied to specific content (banners, popups, etc). AdGuard has a list of standard filters created by our team. Our team constantly improves and updates them, and we hope our filters meet the needs of most of our users.
At the same time, AdGuard allows you to create your own custom filters, using the same type of rules that we have in our filters.
To describe the syntax of our filtering rules we use Augmented BNF for Syntax Specifications, but we do not always strictly follow this specification.
AdGuard syntax is originally based on syntax of Adblock Plus rules, but it was extended with new types of rules for better ad filtering. Some parts of this article's content about the rules common to both AdGuard and ABP was taken from this article.
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.
For example:
! This is the comment. Under this line there is an actual filtering rule.
||example.org^
This rule blocks:
http://example.org/ad1.gif
http://subdomain.example.org/ad1.gif
https://ads.example.org:8000/
This rule does not block:
http://ads.example.org.us/ad1.gif
http://example.com/redirect/http://ads.example.org/
This rule blocks:
http://example.org/
This rule does not block:
https://example.org/banner/img
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.
This rule blocks:
http://example.org/script.js
if this script is loaded from example.com
.This rule does not block:
https://example.org/script.js
if this script is loaded from example.org
.https://example.org/banner.png
because it is not a script.This rule unblocks:
http://example.org/banner.png
even if there is a blocking rule for this address.Blocking rules with
$important
modifier can override exceptions.
This rule unblocks
example.com
.Cosmetic rules are based on using a special language named CSS, which every browser understands. Basically, it adds a new CSS style to the website which purpose is to hide particular elements. You can learn more about CSS in general here.
AdGuard extends CSS and lets filters developers handle much more complicated cases. However, to use these extended rules, you need to be fluent in regular CSS.
Name | CSS selector | Description |
---|---|---|
ID selector | #banners |
Matches all elements with id attribute equal to banners .![]() |
Class selector | .banners |
Matches all elements with class attribute containing banners .![]() |
Attribute selector | div[class="banners"] |
Matches all div elements with class attribute exactly equal to banners .![]() |
Attribute substring selector | div[class^="advert1"] |
Matches all div elements which class attribute starts with the advert1 string.![]() |
Attribute substring selector | div[class$="banners_ads"] |
Matches all div elements which class attribute ends with the banners_ads string.![]() |
Attribute substring selector | a[href^="http://example.com/"] |
Matches all links that are loaded from http://example.com/ domain.![]() |
Attribute selector | a[href="http://example.com/"] |
Matches all links to exactly the http://example.com/ address.![]() |
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. 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 scope of the rule.
Sub-requests
Basic rules for blocking requests are applied only to sub-requests. That means they will not block the loading of the page.
Response status
Browser detects a blocked request as completed with an error.
rule = ["@@"] pattern [ "$" modifiers ]
modifiers = [modifier0, modifier1[, ...[, modifierN]]]
pattern
— address mask. Every request's URL is collated to this mask. You can also use special characters in the template, their description is below.@@
— A marker that is used in rules of exception. To turn off filtering for a request, start your rule with this marker.modifiers
— Parameters that "clarify" the basic rule. Some of them limit the scope of the rule and some can completely change they way it works.*
— Wildcard character. It is used to represent "any set of characters". This can also be an empty string or a string of any length.||
— Matching the beginning of an address. With this character you don't have to specify a particular protocol and subdomain in address mask. It means, ||
stands for http://*.
, https://*.
, ws://*.
, wss://*.
at once.^
— 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.|
— 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
.Visual representation. We also recommend to get acquainted with this article, for better understanding of how such rules should be made.
If you want even more flexibility in making rules, you can use Regular expressions instead of a default simplified mask with special characters.
Performance. Rules with regular expressions work more slowly, therefore it is recommended to avoid them or to limit their scope to specific domains.
If you want a blocker to determine a regular expression, the pattern
has to look like this:
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+/
.
Compatibility with different versions of AdGuard. AdGuard browser extension for Safari and AdGuard for iOS do not fully support regular expressions because of Content Blocking API restrictions (look for "The Regular expression format" section).
Wildcard characters are supported for TLDs of the domains in patterns of cosmetic, html and javascript rules.
For example, the cosmetic rule example.*##.banner
will match any example.TLD
request (example.ru
, example.com
, example.net
, example.org
, etc.).
For the basic rules the described logic will be applicable only for the domains specified in $domain
modifier (for example, ||*/banners/*$image,domain=example.*
).
Compatibility with different versions of AdGuard. Supported by: AdGuard for Windows/macOS/Android/Safari/iOS and browser extensions for Chrome/Firefox/Edge.
||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.org^$third-party
— a rule that blocks third-party requests toexample.org
and it's subdomains.
@@||example.com$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.Attention! 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 undestanding 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^$popup,third-party
The following modifiers are the most simple and frequently used.
domain
domain
limits the rule application area to a list of domains (and their subdomains). To add multiple domains to one rule, use the |
character as a separator.
domain
examples||baddomain.com^$domain=example.org
— a rule to block requests that match the specified mask, and are sent from domain example.org
or its subdomains.||baddomain.com^$domain=example.org|example.com
— the same rule, but it works for both example.org
and example.com
.If you want the rule not to be applied to certain domains, start a domain name with ~
sign.
domain
and ~
examples||baddomain.com^$domain=~example.org
— a rule to block requests that match the specified mask, and are sent from any domain except example.org
or it's subdomains.||baddomain.com^$domain=example.org|~foo.example.org
— this rule blocks requests that are sent from example.org
and all it's subdomains, except the subdomain foo.example.org
.third-party
A restriction of third-party and own requests. A third-party request is a request from different domain. For example, a request to example.org
, from domain.com
is a third-party request.
Subdomains. Please note that request from domain to it's subdomain (or vice versa) is not considered a third-party request. For example, a request to
subdomain.example.org
, sent from the domainexample.org
is not a third-party request.
If there is a third-party
modifier, the rule is only applied to third-party request.
third-party
examples||domain.com^$third-party
— rule is applied to all domains, except domain.com
and it's subdomains. Third-party request example: 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-party. Which means, they have to be sent from the same domain.
~third-party
examples||domain.com$~third-party
— this rule is applied to domain.com
, but not to the other domains. Example of a request that is not a third-party request: http://domain.com/icon.ico
.popup
AdGuard will try to close the browser tab with any address that matches a blocking rule with this modifier. Please note that not all the tabs can be closed.
popup
examples||domain.com^$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.It may not work if the popped up page is cached by the browser. It also will not work with some tricky popup methods. In such cases, it is better to use AdGuard Popup Blocker extension.
Important! Unlike with browser extensions,
$popup
modifier is very unreliable when used with AdGuard apps for Windows, Mac and Android. In AdGuard for Safari and iOS,$popup
rules will simply block the page right away.
match-case
This modifier defines a rule which applies only to addresses that match the case. Default rules are case-insensitive.
match-case
examples*/BannerAd.gif$match-case
— this rule will block http://example.com/BannerAd.gif
, but not http://example.com/bannerad.gif
.There is a set of modifiers, which can be used to limit the rule's application area to certain type of content. These modifiers can also be combined to cover, for example, both images and scripts.
Compatibility with different versions of AdGuard. Please note that there is a big difference in how AdGuard determines the content type on different platforms. For browser extensions, content type for every request is provided by browser. AdGuard for Windows, Mac and Android use following method: first we try to determine the type of the request by the
Sec-Fetch-Dest
request header or by the filename extension. If the request is not blocked at this stage, the type will be determined using theContent-Type
header at the beginning of the server response.
||example.org^$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.image
The rule corresponds to images requests.
stylesheet
The rule corresponds to CSS files requests.
script
The rule corresponds to script requests (e.g. javascript, vbscript).
object
The rule corresponds to browser plugins resourses. (e.g. Java or Flash).
object-subrequest
The rule corresponds to requests by browser plugins (it's usually Flash).
Compatibility with different versions of AdGuard. AdGuard for Windows, macOS and Android often can't accurately detect this type and defines it as
other
.
font
The rule corresponds to requests for fonts (e.g. .woff filename extension).
media
The rule corresponds to requests for media files (music and video, e.g. .mp4 files).
subdocument
The rule corresponds to requests for built-in pages (HTML tags frame
and iframe
).
ping
The rule corresponds to requests caused by either navigator.sendBeacon()
or the ping
attribute on links.
Compatibility with different versions of AdGuard. AdGuard for Windows, macOS and Android often can't accurately detect
navigator.sendBeacon()
. For reliable detection, use AdGuard browser extensions.
xmlhttprequest
The rule applies only to ajax requests (requests sent via javascript object XMLHttpRequest
).
Compatibility with different versions of AdGuard. AdGuard for Windows, macOS and Android often can't accurately detect this type and sometimes detects it as
other
orscript
.
websocket
The rule applies only to WebSocket connections.
Compatibility with different versions of AdGuard. AdGuard for Safari and iOS cannot properly apply this modifier due to Safari limitations.
webrtc
The rule applies only to WebRTC connections.
Please note that blocking WebRTC can interfere with the work of some browser applications, such as messengers, chats, cinemas, or games.
webrtc
example||example.com^$webrtc,domain=example.org
- this rule blocks webRTC connectios to example.com
for example.org
.@@*$webrtc,domain=example.org
- this rule disables the RTC wrapper for example.org
.Deprecation notice. This modifier is deprecated and will be removed in the future. If you need to suppress WebRTC, consider using the
$nowebrtc
scriptlet.
other
The rule applies to requests for which the type has not been determined or doesn't match the types listed above.
Exception rules disable the other basic rules for the addresses to which they correspond. They begin with a @@
mark. All the basic modifiers listed above can be applied to them and they also have a few special modifiers.
Visual representation. We recommend to get acquainted with this article, for better understanding of how exception rules should be made.
elemhide
Disables any cosmetic rules on the pages matching the rule. You will find the information about cosmetic rules further.
elemhide
example@@||example.com^$elemhide
— disables all cosmetic rules on pages at example.com
and all subdomains.content
Disables HTML filtering rules on the pages matching the rule. You will find the information about HTML filtering rules further.
content
example@@||example.com^$content
— disables all HTML filtering rules on pages at example.com
and all subdomains.jsinject
Forbids adding of javascript code to the page. You can read about javascript rules further.
jsinject
example@@||example.com^$jsinject
— disables javascript on pages at example.com
and all subdomains.urlblock
Disables blocking of all requests sent from the pages matching the rule.
urlblock
example@@||example.com^$urlblock
— any requests sent from the pages at example.com
and all subdomains are not going to be blocked.extension
Disables all userscripts on the pages matching this rule. Note, that this modifier only makes sense in AdGuard products that can work as userscript hosts (AdGuard for Windows/macOS/Android).
extension
example@@||example.com^$extension
— userscripts won't work on all pages of the example.com
website.document
Completely disables blocking on corresponding pages. It is equal to simultaneous use of elemhide
, content
, urlblock
, jsinject
and extension
.
document
example@@||example.com^$document
— completely disables filtering on all pages at example.com
and all subdomains.@@||example.com^$document,~extension
— completely disables blocking on any pages at example.com
and all subdomains, but continues to run userscripts there.stealth
Disables the Stealth Mode module for all corresponding pages and requests.
stealth
examples@@||example.com^$stealth
— disables Stealth Mode
for example.com
(and subdomains) requests.@@||domain.com^$script,stealth,domain=example.com
— disables Stealth Mode
only for script domain.com
(and subdomains) requests on example.com
and all subdomains.Compatibility with different versions of AdGuard. Stealth Mode is currently available in AdGuard for Windows, Mac, Android and AdGuard browser extensions for Chrome, Firefox, Edge. For now, the products that do not support Stealth Mode will ignore the rules with this modifier.
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.
For example, these rules are generic:
###banner
~domain.com###banner
||domain.com^
||domain.com^$domain=~example.com
And these are not:
domain.com###banner
||domain.com^$domain=example.com
generichide
Disables all generic cosmetic rules on pages that correspond to exception rule.
@@||example.com^generichide
— disables generic cosmetic rules on any pages at example.com
and all subdomains.genericblock
Disables generic basic rules on pages that correspond to exception rule.
@@||example.com^$genericblock
— disables generic basic rules on any pages at example.com
and all subdomains.specifichide
Has an opposite effect to generichide
. Disables all specific element hiding and CSS rules, but not general ones.
@@||example.org^$specifichide
— will disable example.org##.banner
but not ##.banner
.Please note that
$elemhide
modifier can disable all cosmetic rules at once.Compatibility with different versions of AdGuard. Rules with this modifier are supported by AdGuard for Windows, Mac, Android, and AdGuard browser extensions for Chrome, Firefox, Edge. Developer builds only at this moment.
These modifiers are able to completely change the behaviour of basic rules.
removeparam
$removeparam
and$queryprune
are completely interchangeable and are aliases to each other.
Rules with $removeparam
modifier are intended to to strip query parameters from pages’ URLs. Please note that such rules are only applied to GET
, HEAD
, and OPTIONS
requests.
$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 tohttp://example.com/page?another=2
.You can also use regular expressions to match query parameters and/or their values:
$removeparam=/regex/[options]
-- removes query parameters matching the regex regular expression from URLs of any request. Unlike basic syntax, it means "remove query parameters normalized to a name=value
string which match the regex regular expression". [options]
here is the list of regular expression options. At the moment, the only supported option is i
which makes matching case-insensitive.Escaping special characters: don't forget to escape special characters like
,
,/
and$
in the regular expressions. Use\
character for that purpose. For example, an escaped comma should look like this:\,
.Important: note that regex-type rules target both parameter's name and value. In order to minimize the chance of mistakes, it is safer to start every regex 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's another slash character (
/
) to the left of it,- There's another unescaped
$
character to the left of that slash character.
Specify naked $removeparam
to remove all query parameters:
||example.org^$removeparam
-- removes all query parameters from URLs matching ||example.org^
.Use ~
to apply inversion:
$removeparam=~param
-- removes all query parameters with the name different from param
.$removeparam=~/regex/
-- removes all query parameters that do not match the regex regular expression.$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=/regex/
-- negates the rule with $removeparam=/regex/
for any request matching ||example.org^
.Multiple rules matching a single request
In the case when multiple$removeparam
rules match a single request, each of them will be applied one by one.
$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's 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.
Compatibility with other modifiers
$removeparam
rules are not compatible with any other modifiers except$domain
,$third-party
,$app
,$important
and$match-case
. The rules which have any other modifiers are considered invalid and will be discarded.Please note that
$removeparam
rules can also be disabled by$document
and$urlblock
exception rules. But basic exception rules without modifiers don't do that. For example,@@||example.com^
will not disable$removeparam=p
for requests to example.com, but@@||example.com^$urlblock
will.Compatibility with different versions of AdGuard. Rules with this modifier are supported by AdGuard for Windows, Mac, Android, and AdGuard browser extensions for Chrome, Firefox, Edge. Developer builds only at this moment.
Restrictions. Please note that this type of rules can be used only in trusted filters. This category includes your own User filter and all the filters created by AdGuard Team.
important
The $important
modifier applied to a rule increases its priority over any other rule without $important
modifier. Even over basic exception rules.
||example.org^$important
@@||example.org^
||example.org^$important
will block all requests despite of the exception rule.
||example.org^$important
@@||example.org^$important
Now the exception rule also has $important
modifier so it will prevail.
The $important
modifier will be ignored if a document-level exception rule is applied to the document.
||example.org^$important
@@||test.org^$document
If a request to example.org
is sent from the test.org
domain, the rule won't be applied despite it has the $important
modifier.
badfilter
The rules with the badfilter
modifier disable other basic rules to which they refer. It means that the text of the disabled rule should match the text of the badfilter
rule (without the badfilter
modifier).
badfilter
examples||example.com$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
empty
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.
empty
example||example.org^$empty
— returns an empty response to all requests to example.org
and all subdomains.Deprecation notice. Rules with this modifier are deprecated in favor of the
$redirect
modifier. Please note that it will be removed in the future.Compatibility with different versions of AdGuard. Rules with this modifier are not supported by AdGuard for Safari and iOS.
mp4
As a response to blocked request AdGuard returns a short video placeholder.
mp4
example||example.com/videos/$mp4
— block a video downloads from ||example.com/videos/*
and changes the response to a video placeholder.Deprecation notice. Rules with this modifier are deprecated in favor of the
$redirect
modifier. Please note that it will be removed in the future.Compatibility with different versions of AdGuard. Rules with this modifier are not supported by AdGuard for Safari and iOS.
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.
Please note
You will need some knowledge of regular expressions to use this modifier.
$replace
rules features$replace
rules apply to any text response, but will not apply to binary (media
, image
, object
, etc).$replace
rules do not apply if the size of the original response is more than 3MB.$replace
rules have a higher priority than other basic rules (including exception rules). So if a request corresponds to two different rules one of which has the $replace
modifier, this rule will be applied.$content
or $document
modifiers do disable $replace
rules for requests matching them.$generichide
, $elemhide
or $jsinject
modifiers) are applied alongside $replace
rules. It means that you can modify the page's 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.
In general, replace
syntax is similar to replacement with regular expressions in Perl.
replace = "/" regex "/" replacement "/" modifiers
regex
— regular expression.replacement
— a string that will be used to replace the string corresponding to regex
.modifiers
— regular expression flags. For example, i
- insensitive search, or s
- single-line mode.In the $replace
value, two characters must be escaped: comma (,
) and ($
). Use (\
) for it. For example, an escaped comma looks like this: \,
.
$replace
example||example.org^$replace=/(<VAST[\s\S]*?>)[\s\S]*<\/VAST>/\$1<\/VAST>/
There are three parts in this rule:
(<VAST(.|\s)*?>)(.|\s)*<\/VAST>
\$1<\/VAST>
(please note that $
is escaped)i
(insensitive search)You can see how this rule works here:
http://regexr.com/3cesk
$replace
rules example||example.org^$replace=/X/Y/
||example.org^$replace=/Z/Y/
@@||example.org/page/*$replace=/Z/Y/
example.org
.||example.org/page/
, but rule 1 still works!.$replace
rules@@||example.org^$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.Compatibility with different versions of AdGuard. These rules are supported by AdGuard for Windows, Mac, Android and by the AdGuard's Firefox add-on. This type of rules don't work in extensions for other browsers because they are unable to modify content on the network level.
Restrictions. Please note that this type of rules can be used only in trusted filters. This category includes your own User filter and all the filters created by AdGuard Team.
csp
This modifier completely changes the rule behavior. If it is applied to a rule, it will not block the matching request. The response headers are going to be modified instead.
In order to use this type of rules, it is required to have the basic understanding of the Content Security Policy security layer.
For the requests matching a $csp
rule, we will strengthen response's security policy by adding additional content security policy equal to the $csp
modifier contents. $csp
rules are applied independently from any other rule type. Other basic rules have no influence on it save for document-level exceptions (see the examples section).
Multiple rules matching a single request. In case if multiple
$csp
rules match a single request, we will apply each of them.
csp
syntax$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 for further information.
Limitations
- Please note that there're a few characters forbidden in the
$csp
value: (,
), ($
)csp
rules support limited list of modifiers:domain
,important
,subdocument
- Rules with
report-*
directives are considered invalid.
csp
examples||example.org^$csp=frame-src 'none'
— prohibits all frames on example.org and it's subdomains.@@||example.org/page/*$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.cookie
The $cookie
modifier completely changes rule behavior. Instead of blocking a request, this modifier makes us 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.
$cookie
syntaxThe rule syntax depends on whether we are going to block all cookies or to remove a single cookie. The rule behavior can be changed with maxAge
and sameSite
modifiers.
||example.org^$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:
3600
seconds||example.org^$cookie
-- blocks ALL cookies set by example.org
. This is an equivalent to setting maxAge
to zero.||example.org^$cookie=NAME
-- blocks a single cookie named NAME
||example.org^$cookie=/regular_expression/
-- blocks every cookie that matches a given regular expressionImportant: in the case of a regular expression matching, two characters must be escaped: comma (
,
) and ($
). Use (\
) for it. For example, escaped comma looks like this:\,
.
$cookie
rules are not affected by regular exception rules (@@
) unless it's a $document
exception. In order to disable a $cookie
rule, the exception rule should also have a $cookie
modifier. Here's how it works:
@@||example.org^$cookie
-- unblocks all cookies set by example.org
@@||example.org^$cookie=NAME
-- unblocks a single cookie named NAME
@@||example.org^$cookie=/regular_expression/
-- unblocks every cookie matching a given regular expressionLimitations:
$cookie
rules support a limited list of modifiers:domain
,~domain
,important
,third-party
,~third-party
.
$cookie=__cfduid
-- blocks CloudFlare cookie everywhere$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 inCompatibility with different versions of AdGuard. This type of rules is not supported by AdGuard for iOS and Safari.
network
This is basically a Firewall-kind of rules allowing to fully block or unblock access to a specified remote address.
$network
rules match IP addresses only! You cannot use it to block or unblock access to a domain.[2001:4860:4860::8888]$network
instead of [2001:4860:4860:0:0:0:0:8888]$network
.$network
rule makes AdGuard bypass data to the matching endpoint, e.g. there will be no further filtering at all.network
examples174.129.166.49:3478^$network
- blocks access to 174.129.166.49:3478
(but not to 174.129.166.49:34788
).[2001:4860:4860::8888]:443^$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.Compatibility with different versions of AdGuard. Only AdGuard for Windows, Mac, Android are technically capable of using this type of rules.
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 where some of the filtering rules must be application-specific.
org.example.app
).chrome.exe
).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
In the case of Android, use the apps' package names (i.e. org.example.app
). In the case of Windows
app
examples||baddomain.com^$app=org.example.app
— a rule to block requests that match the specified mask, and are sent from the com.adguard.android
Android app.||baddomain.com^$app=org.example.app1|org.example.app2
— the same rule, but it works for both org.example.app1
and org.example.app2
apps.If you want the rule not to be applied to certain apps, start the app name with ~
sign.
app
and ~
examples||baddomain.com^$app=~org.example.app
— a rule to block requests that match the specified mask, and are sent from any app save for the org.example.app
.||baddomain.com^$app=~org.example.app1|~org.example.app2
— same as above, but now two apps are excluded: org.example.app1
and org.example.app2
.Compatibility with different versions of AdGuard. Only AdGuard for Windows, Mac, Android are technically capable of using this type of rules.
redirect
AdGuard is able to redirect web requests to a local "resource".
redirect
syntaxAdGuard uses the same filtering rules 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.
$redirect
rules' priority is higher than the regular basic blocking rules' priority. This means that if there's a basic blocking rule (even with$important
modifier),$redirect
rule will prevail over it. If there's a whitelist (@@
) rule matching the same URL, it will disable redirecting as well (unless the$redirect
rule is also marked as$important
).
$redirect
rules@@||example.org^$redirect
will disable all $redirect
rules for URLs that match ||example.org^
.@@||example.org^$redirect=redirectName
will disable all rules with $redirect=redirectName
for any request that matches ||example.org^
.redirect
examples||example.org/script.js$script,redirect=noopjs
This rule redirects all requests to example.org/script.js
to the resource named noopjs
.
||example.org/test.mp4$media,redirect=noopmp4-1s
This rule redirects all requests to example.org/test.mp4
to the resource named noopmp4-1s
.
More information on scriptlets, redirects, and their usage is available in this GitHub section.
Compatibility with different versions of AdGuard. This type of rules is not supported by AdGuard for iOS and Safari.
noop
noop
modifier does nothing and can be used solely to increase rules' readability. It consists of a sequence of underscore characters (_
) of any length and can appear in a rule as many times as needed.
noop
examples:||example.com$_,removeparam=/^ss\\$/,_,image
||example.com$replace=/bad/good/,___,~third-party
Compatibility with different versions of AdGuard. Available in Developer builds only at this moment.
However, the capabilities of the basic rules may not be sufficient 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.
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 are used to hide the elements of web pages. It is similar to applying { display: none; }
style to selected element.
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
.
Please note that this rule will be also applied to all subdomains of
example.org
andexample.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
.
Please note, 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.
example.com##div.textad
— hides a div
with a 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 a class textad
at all domains, except example.com
and it's subdomains.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.
#@#.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.
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 this rules you can basically add any CSS styles to the page.
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 with different versions of AdGuard. Note that CSS rules are not supported by AdGuard for iOS.
rule = [domains] "#$#" selector "{" style "}"
domains = [domain0, domain1[, ...[, domainN]]]
selector
— CSS selector, 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.example.com#$#body { background-color: #333!important; }
This rule will apply a style background-color: #333!important;
to the body
element at example.com
and all subdomains.
Just like with element hiding, there is a type of rules that disable the selected CSS style rule for particular domains.
Exception rules syntax is almost the same, you just have to change #$#
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#@$#.textad { visibility: hidden; }
We recommend to use this kind of exceptions only if it is not possible to change the CSS rule itself. In other cases it is better to change the original rule, using domain restrictions.
CSS 3.0 is not always enough to block ads. To solve this problem AdGuard extends CSS capabilities by adding support for the new pseudo-elements. To use extended CSS selectors we have developed a separate open source module.
Application area. Extended selectors can be used in any cosmetic rule, whether they are element hiding rules or CSS rules.
Compatibility with different versions of AdGuard. Note that CSS rules are not supported by AdGuard for iOS.
Regardless of the CSS pseudo-classes you are using in the rule, you can use special markers to make these rules use the "Extended CSS" engine. It is recommended to use these markers for all "extended CSS" cosmetic rules so that it was easier to find them.
The syntax for extended CSS rules:
#?#
— for element hiding (#@?#
— for exceptions )#$?#
— for CSS injection (#@$?#
— for exceptions )We strongly recommend using these markers any time when you use an extended CSS selector.
example.org#?#div:has(> a[target="_blank"][rel="nofollow"])
— this rule will block all div
elements that contain link as a child node with [target="_blank"][rel="nofollow"]
attributes. The rule will only work for example.org
and all it's subdomains.example.com#$?#h3:contains(cookies) { display: none!important; }
— this rule will set style display: none!important
for all h3
elements that contain cookies
word. The rule will only work for example.com
and all it's subdomains.example.net#?#.banner:matches-css(width: 360px)
— this rule will block all .banner
elements that contain width: 360px
style property. The rule will only work for example.net
and all it's subdomains.example.net#@?#.banner:matches-css(width: 360px)
— this rule will disable the previous rule.Please note that now you can apply simple selectors using the ExtCss engine by using a rule like this:
#?#div
:has()
Draft CSS 4.0 specification describes pseudo-class :has
. Unfortunately, it is not yet supported by browsers.
Syntax
:has(selector)
Backward compatible syntax:
[-ext-has="selector"]
Supported synonyms for better compatibility: :-abp-has
, :if
.
Pseudo-class :has()
selects the elements that includes the elements that fit to selector
.
Examples
Selecting all div
elements, which contain an element with the banner
class:
<!-- HTML code -->
<div>Do not select this div</div>
<div>Select this div<span class="banner"></span></div>
Selector:
div:has(.banner)
Backward compatible syntax:
div[-ext-has=".banner"]
:if-not()
This pseudo-class is basically a shortcut for :not(:has())
. It is supported by ExtendedCss for better compatibility with some filters subscriptions, but it is not recommended to use it in AdGuard filters. The rationale is that one day browsers will add :has
native support, but it will never happen to this pseudo-class.
:contains()
This pseudo-class principle is very simple: it allows to select the elements that contain specified text or which content matches a specified regular expression. Regex flags are supported. Please note that this pseudo-class uses textContent
element property for matching (and not the innerHTML
).
Syntax
// matching by plain text
:contains(text)
// matching by a regular expression
:contains(/regex/i)
Backward compatible syntax:
// matching by plain text
[-ext-contains="text"]
// matching by a regular expression
[-ext-contains="/regex/"]
Supported synonyms for better compatibility:
:-abp-contains
,:has-text
.
Examples
Selecting all div
elements, which contain text banner
:
<!-- HTML code -->
<div>Do not select this div</div>
<div id="selected">Select this div (banner)</div>
<div>Do not select this div <div class="banner"></div></div>
Selector:
// matching by plain text
div:contains(banner)
// matching by a regular expression
div:contains(/this .* banner/)
// also with regex flags
div:contains(/this .* banner/gi)
Backward compatible syntax:
// matching by plain text
div[-ext-contains="banner"]
// matching by a regular expression
div[-ext-contains="/this .* banner/"]
Please note that in this example only a
div
withid=selected
will be selected, because the next element does not contain any text;banner
is a part of code, not a text.
:matches-css()
These pseudo-classes allow to select an element by its current style property. The work of this pseudo-class is based on using the window.getComputedStyle
function.
Syntax
/* element style matching */
selector:matches-css(property-name ":" pattern)
/* ::before pseudo-element style matching */
selector:matches-css-before(property-name ":" pattern)
/* ::after pseudo-element style matching */
selector:matches-css-after(property-name ":" pattern)
Backward compatible syntax:
selector[-ext-matches-css="property-name ":" pattern"]
selector[-ext-matches-css-after="property-name ":" pattern"]
selector[-ext-matches-css-before="property-name ":" pattern"]
property-name
— a name of CSS property to check the element forpattern
— 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 /regex/
.For non-regex patterns,
(
,)
,[
,]
must be unescaped, because we require escaping them in the filtering rules.For regex patterns,
"
and\
should be escaped, because we manually escape those in extended-css-selector.js.
Examples
Selecting all div
elements which contain pseudo-class ::before
with specified content:
<!-- HTML code -->
<style type="text/css">
#to-be-blocked::before {
content: "Block me"
}
</style>
<div id="to-be-blocked" class="banner"></div>
<div id="not-to-be-blocked" class="banner"></div>
Selector:
// Simple matching
div.banner:matches-css-before(content: block me)
// Regular expressions
div.banner:matches-css-before(content: /block me/)
Backward compatible syntax:
// Simple matching
div.banner[-ext-matches-css-before="content: block me"]
// Regular expressions
div.banner[-ext-matches-css-before="content: /block me/"]
:matches-attr()
This pseudo-class allows to select an element by its attributes, especially if they are randomized.
Syntax
selector:matches-attr("name"[="value"])
name
— attribute name OR regular expression for attribute namevalue
— optional, attribute value OR regular expression for attribute valueFor regex patterns,
"
and\
should be escaped.
Examples
<!-- HTML code -->
<div id="targer1" class="matches-attr" hsd4jkf-link="ssdgsg-banner_240x400"></div>
<div id="targer2" class="has matches-attr">
<div data-sdfghlhw="adbanner"></div>
</div>
<div id="targer3-host" class="matches-attr has contains">
<div id="not-targer3" wsdfg-unit012="click">
<span>socials</span>
</div>
<div id="targer3" hrewq-unit094="click">
<span>ads</span>
</div>
</div>
<div id="targer4" class="matches-attr upward">
<div >
<inner-afhhw class="nyf5tx3" nt4f5be90delay="1000"></inner-afhhw>
</div>
</div>
// for div#targer1
div:matches-attr("/-link/")
// for div#targer2
div:has(> div:matches-attr("/data-/"="adbanner"))
// for div#targer3
div:matches-attr("/-unit/"="/click/"):has(> span:contains(ads))
// for div#targer4
*[class]:matches-attr("/.{5,}delay$/"="/^[0-9]*$/"):upward(2)
:matches-property()
This pseudo-class allows to select an element by its properties.
Syntax
selector:matches-property("name"[="value"])
name
— property name OR regular expression for property namevalue
— optional, property value OR regular expression for property valueFor regex patterns,
"
and\
should be escaped.
name
supports regexp for property in chain, e.g.prop./^unit[\\d]{4}$/.type
Examples
divProperties = {
id: 1,
check: {
track: true,
unit_2ksdf1: true,
},
memoizedProps: {
key: null,
tag: 12,
_owner: {
effectTag: 1,
src: 'ad.com',
},
},
};
// element with such properties can be matched by any of such rules:
div:matches-property("check.track")
div:matches-property("check./^unit_.{4,6}$/"))
div:matches-property("memoizedProps.key"="null")
div:matches-property("memoizedProps._owner.src"="/ad/")
:xpath()
This pseudo-class allows to select an element by evaluating an XPath expression.
Limited to work properly only at the end of selector, except of pseudo-class :remove().
The :xpath()
pseudo-class is different from other pseudo-classes. Whereas all other operators are used to filter down a resultset of elements, the :xpath()
operator can be used both to create a new resultset or filter down an existing one. For this reason, subject selector
is optional. For example, an :xpath()
operator could be used to create a new resultset consisting of all ancestor elements of a subject element, something not otherwise possible with either plain CSS selectors or other procedural operators.
Syntax
[selector]:xpath(expression)
selector
- optional, a plain CSS selector, or a Sizzle compatible selectorexpression
— a valid XPath expressionExamples
// Filtering results from selector
div:xpath(//*[@class="test-xpath-class"])
div:has-text(/test-xpath-content/):xpath(../../..)
// Use xpath only to select elements
facebook.com##:xpath(//div[@id="stream_pagelet"]//div[starts-with(@id,"hyperfeed_story_id_")][.//h6//span/text()="People You May Know"])
:nth-ancestor()
This pseudo-class allows to lookup the nth ancestor relative to the currently selected node.
It is a low-overhead equivalent to :xpath(..[/..]*)
.
Limited to work properly only at the end of selector, except of pseudo-class :remove().
Syntax
selector:nth-ancestor(n)
selector
— a plain CSS selector, or a Sizzle compatible selector.n
— positive number >= 1 and < 256, distance from the currently selected node.Examples
div.test:nth-ancestor(4)
div:has-text(/test/):nth-ancestor(2)
:upward()
This pseudo-class allows to lookup the ancestor relative to the currently selected node.
Limited to work properly only at the end of selector, except of pseudo-class :remove().
Syntax
/* selector parameter */
subjectSelector:upward(targetSelector)
/* number parameter */
subjectSelector:upward(n)
subjectSelector
— a plain CSS selector, or a Sizzle compatible selectortargetSelector
— a valid plain CSS selectorn
— positive number >= 1 and < 256, distance from the currently selected nodeExamples
div.child:upward(div[id])
div:contains(test):upward(div[class^="parent-wrapper-")
div.test:upward(4)
div:has-text(/test/):upward(2)
: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 pseudo-class :remove()
as well as pseudo-property remove
.
Pseudo-class
:remove()
is limited to work properly only at the end of selector.
Syntax
! pseudo-class
selector:remove()
! pseudo-property
selector { remove: true; }
selector
— a plain CSS selector, or a Sizzle compatible selectorExamples
div.inner:remove()
div:has(> div[ad-attr]):remove()
div:xpath(../..):remove()
div:contains(target text) { remove: true; }
div[class]:has(> a:not([id])) { remove: true; }
Please note that all style properties will be ignored if
:remove()
pseudo-class orremove
pseudo-property is used.
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 "debug"-mode either for a single selector or for all selectors depending on the debug
value.
Debugging a single selector
#$#.banner { display: none; debug: true; }
Enabling global debug
#$#.banner { display: none; debug: global; }
To load ExtendedCss to a current page, copy and execute the following code in a browser console:
!function(E,x,t,C,s,s_){C=E.createElement(x),s=E.getElementsByTagName(x)[0],C.src=t,
C.onload=function(){alert('ExtCss loaded successfully')},s.parentNode.insertBefore(C,s)}
(document,'script','https://AdguardTeam.github.io/ExtendedCss/extended-css.min.js')
Alternatively, install an "ExtendedCssDebugger" userscript: https://github.com/AdguardTeam/Userscripts/blob/master/extendedCssDebugger/extended-css.debugger.user.js
You can now use the ExtendedCss
constructor in the global scope, and its method ExtendedCss.query
as document.querySelectorAll
.
var selectorText = "div.block[-ext-has='.header:matches-css-after(content: Anzeige)']";
ExtendedCss.query(selectorText) // returns an array of Elements matching selectorText
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 with different versions of AdGuard. Rules are supported by AdGuard for Windows, Mac, Android and by the AdGuard's Firefox add-on. This type of rules don't work in extensions for other browsers because they are unable to modify content on network level.
rule = [domains] "$$" tagName [attributes]
domains = [domain0, domain1[, ...[, domainN]]]
attributes = "[" name0 = value0 "]" "[" name1 = value2 "]" ... "[" nameN = valueN "]"
tagName
— name of the element in lower case, for example div
or script
.domains
— domain restriction for the rule. Same principles as in element hiding rules syntax.attributes
— a list of attributes, that limit the elements selection. name
- attribute name, value
- substring, that is contained in attribute value.HTML code
<script data-src="/banner.js"></script>
Rule
example.org$$script[data-src="banner"]
This rule will delete all script
elements with data-src
attribute that contain banner
substring. The rule will only work for example.org
and all it's subdomains.
In addition to usual attribures, 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
This is the most frequently used special attribute. It limits selection with those elements whose innerHTML code contains the specified substring.
You should use
""
to escape"
, for instance:
$$script[tag-content="alert(""this is ad"")"]
For example, let's take a look at this HTML code:
<script type="text/javascript">
document.write('<div>banner text</div>" />');
</script>
Following rule will delete all script
elements with a banner
substring in their code:
$$script[tag-content="banner"]
Nested elements. If we are dealing with multiple nested elements and they all fall within the same HTML filtering rule, they all are going to be deleted.
wildcard
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 should use
""
to escape"
, for instance:
$$script[wildcard=""banner""]
For example:
$$script[wildcard="*banner*text*"]
It will check, if the element's code contains two consecutive substrings banner
and text
.
max-length
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:
$$div[tag-content="banner"][max-length="400"]
This rule will remove all the div
elements, whose code contains the substringbanner
and the length of which does not exceed 400
characters.
min-length
Specifies the minimum length for content of HTML element. If this parameter is set and the content length is less than preset value - a rule does not apply to the element.
For example:
$$div[tag-content="banner"][min-length="400"]
This rule will remove all the div
elements, whose code contains the substringbanner
and the length of which exceeds 400
characters.
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.
AdGuard supports a special type of rules that allows you to inject any javascript code to websites pages.
Restrictions. Please note that this type of rules can be used only in trusted filters. This category includes your own User filter and all the filters created by AdGuard Team.
Compatibility with different versions of AdGuard. Javascript rules aren't supported by AdGuard for iOS.
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.
rule = [domains] "#%#" script
domains
— domain restriction for the rule. Same principles as in element hiding rules.script
— arbitrary javascript code in one string.example.org#%#window.__gaq = undefined;
— executes the code window.__gaq = undefined;
on all pages at example.org
and all subdomains.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.
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.
AdGuard supports a lot of different scriptlets. Please note that in order to achieve cross-blocker compatibility, we also support syntax of uBO and ABP.
Compatibility with different versions of AdGuard. Scriptlet rules aren't supported by AdGuard for iOS.
rule = [domains] "#%#//scriptlet(" scriptletName arguments ")"
scriptletName
(mandatory) is a name of the scriptlet from AdGuard's scriptlets library
arguments
(optional) is a list of String arguments (no other types of arguments are supported)
example.org#%#//scriptlet("abort-on-property-read", "alert")
This rule will be applied to example.org pages (and its subdomains) and will execute the "abort-on-property-read" scriptlet with the "alert" parameter.
More information about scriptlets can be found on GitHub.
Each rule can be modified using the modifiers described in the following paragraphs.
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 of the following characters must be escaped: [
, ]
, ,
, and \
(unless
it's used for the escaping). Use \
to escape them. For example, an escaped bracket looks like
this: \]
.
app
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 $app modifier of basic rules.
app
examples:
[$app=org.example.app]example.com##.textad
- hides a div
with a class textad
at example.com
and all subdomains in requests sent from the org.example.app
Android app.[$app=~org.example.app1|~org.example.app2]example.com##.textad
- hides a div
with a class textad
at example.com
and all subdomains in requests sent from any app except org.example.app1
and org.example.app2
.[$app=com.apple.Safari]example.org#%#//scriptlet('prevent-setInterval', 'check', '!300')
. This rule will apply the corresponding scriptlet only in Safari browser on Mac.[$app=org.example.app]#@#.textad
— disables all ##.textad
rules for all domains while using org.example.app
.Compatibility with different versions of AdGuard. This type of rules is supported by AdGuard for Windows, Mac and Android. Developer builds only at this moment.
domain
limits the rule application area to a list of domains (and their subdomains).
The modifier's behavior and syntax perfectly match the corresponding
$domain modifier of
basic rules.
domain
examples:
[$domain=example.com]##.textad
— hides a div
with a 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
- hides a div
with a class textad
at all domains, except example.com
and it's subdomains.Please note that there are 2 ways to specify domain restrictions for non-basic rules:
1) the "classic" way is to specify domains before rule mask and attributes: example.com##.textad
2) 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 rejected.
Compatibility with different versions of AdGuard. This type of rules is supported by AdGuard for Windows, Mac and Android. Developer builds only at this moment.
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.
We provide pre-processor directives that can be used by filters maintainers to improve compatibility with different ad blockers and provide:
Please note that any mistake in a pre-processor directive will lead to AdGuard failing the filter update in the same way as if the filter URL was unavailable.
Pre-processor directives can be used in the User Rules or in the custom filters.
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-processor directives (even other !#include
directives). Ad blockers should consider the case of recursive !#include
and implement a protection mechanism.
Syntax
!#include file_path
file_path
— same origin absolute or relative file path to be includedIf 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
Filters maintainers can use conditions to supply different rules depending on the ad blocker type. When an adblocker encounters an !#if
directive, followed eventually by an !#endif
directive, it will compile the code inside of the directives block only if the specified condition is true. Condition supports all the basic logical operators.
A conditional directive beginning with an
!#if
directive must explicitly be terminated with an!#endif
directive.Whitespaces matter.
!#if
is a valid directive, while!# if
is not.
Syntax
!#if (conditions)
rules_list
!#endif
!#if (conditions)
— start of the blockconditions
— just like in some popular programming languages, pre-processor conditions are based on constants declared by ad blockers. Ad blocker authors define on their own what exact constants do they declare. Possible values:
adguard
— declared always; shows maintainers that this is one of AdGuard products; should be enough in 95% of cases!
should be used before constant) in a specific product only:adguard_app_windows
— AdGuard for Windowsadguard_app_mac
— AdGuard for Macadguard_app_android
— AdGuard for Androidadguard_app_ios
— AdGuard for iOSadguard_ext_safari
— AdGuard for Safariadguard_ext_chromium
— AdGuard Browser extension for Chrome (and chromium-based browsers, e.g. new Microsoft Edge)adguard_ext_firefox
— AdGuard Browser extension for Firefoxadguard_ext_edge
— AdGuard Browser extension for Edge Legacyadguard_ext_opera
— AdGuard Browser extension for Operaadguard_ext_android_cb
— AdGuard Content Blocker for mobile Samsung and Yandex browsersext_ublock
— special case; this one is declared when a uBlock version of a filter is compiled by the FiltersRegistryrules_list
— list of rules!#endif
— end of the blockExamples
! for all AdGuard propucts 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
Safari is notoriously known for its harsh 50k max limit for filtering rules in content blockers. But in AdGuard for Safari and AdGuard for iOS max rule count is raised to 300k by splitting them into several content blockers. Generally, several filters categories are more or less independent, so there is such content blockers with such categories included:
User rules
andAllowlist
are added to every content blocker.
The main issue with using multiple content blockers is that rules inside these content blockers cannot influence each other. This may lead to different unexpected issues. So filters maintainers may use !#safari_cb_affinity
to define Safari content blockers affinity for the rules inside of the directive block.
Syntax
!#safari_cb_affinity(content_blockers)
rules_list
!#safari_cb_affinity
!#safari_cb_affinity(content_blockers)
— start of the blockcontent_blockers
— comma-separated list of content blockers. Possible values:
general
— AdGuard General content blockerprivacy
— AdGuard Privacy content blockersocial
— AdGuard Social content blockersecurity
— AdGuard Security content blockerother
— AdGuard Other content blockercustom
— AdGuard Custom content blockerall
— special keyword that means that the rules must be included into all content blockersrules_list
— list of rules!#safari_cb_affinity(content_blockers)
— end of the blockExamples
! to unhide specific element which is hidden by AdGuard Base filter:
!#safari_cb_affinity(general)
example.org#@#.adBanner
!#safari_cb_affinity
! to whitelist basic rule from AdGuard Tracking Protection filter filter:
!#safari_cb_affinity(privacy)
@@||example.org^
!#safari_cb_affinity
"Hint" is a special comment, instruction to the filters compiler used on the server side (see FiltersRegistry).
!+ HINT_NAME1(PARAMS) HINT_NAME2(PARAMS)
Note, that you can apply multiple hints.
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:
~= (rules count in optimized filter) / (rules count in original filter) * 100
percent
valuepercent
valuepercent < minPercent
OR percent > maxPercent
and strict mode is on then filter compilation should fail, otherwise original rules must be usedIn 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:
Important: If you want to add a rule which shouldn't be removed at optimization use the NOT_OPTIMIZED hint:
!+ NOT_OPTIMIZED
||example.org^
And this rule won't be optimized only for AdGuard for Android:
!+ NOT_OPTIMIZED PLATFORM(android)
||example.org^
Specify which platforms can apply this rule. List of existing platforms:
windows - Example: English filter for Windows - https://filters.adtidy.org/windows/filters/2.txt
mac - Example: English filter for Mac - https://filters.adtidy.org/mac_v2/filters/2.txt
android - Example: English filter for Android - https://filters.adtidy.org/android/filters/2.txt
ios - Example: English filter for iOS - https://filters.adtidy.org/ios/filters/2.txt
ext_chromium - Example: AdGuard browser extension for Chrome - https://filters.adtidy.org/extension/chromium/filters/2.txt
ext_ff - Example: AdGuard browser extension for Firefox - https://filters.adtidy.org/extension/firefox/filters/2.txt
ext_edge - Example: AdGuard browser extension for Edge - https://filters.adtidy.org/extension/edge/filters/2.txt
ext_opera - Example: AdGuard browser extension for Opera - https://filters.adtidy.org/extension/opera/filters/2.txt
ext_ublock - Example: uBlock Origin - https://filters.adtidy.org/extension/ublock/filters/2.txt
ext_safari - Example: AdGuard browser extension for Safari - https://filters.adtidy.org/extension/safari/filters/2.txt
Examples:
This rule will be available for Windows, Mac, and Android only:
!+ PLATFORM(windows,mac,android)
||example.org^
This rule will be available for every platform except Safari extension, iOS, and Android content blocker:
!+ NOT_PLATFORM(ext_safari, ext_android_cb, ios)
||example.org^
We wish you luck with creating you own ad filters.
If you need an advice on how to create your own filters properly, our forum has a special section dedicated to writing your own filtering rules.