This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
Summary
The @document
CSS at-rule restricts the style rules contained within it based on the URL of the document. It is designed primarily for user style sheets. A @document
rule can specify one or more matching functions. If any of the functions apply to a URL, the rule will take effect on that URL.
The main use case is for user-defined stylesheets, though this at-rule can be used on author-defined stylesheets too.
The functions available are:
url()
, which matches an exact URLurl-prefix()
, which matches if the document URL starts with the value provideddomain()
, which matches if the document URL is on the domain provided (or a subdomain of it)regexp()
, which matches if the document URL is matched by the regular expression provided. The expression must match the entire URL.
Syntax
The values provided to the url()
, url-prefix()
, and domain()
functions can optionally be enclosed by single or double quotes. The values provided to the regexp()
function must be enclosed in quotes.
Escaped values provided to the regexp()
function must additionally be escaped from the CSS. For example, a .
(period) matches any character in regular expressions. To match a literal period, you would first need to escape it using regular expression rules (to \.
), then escape that string using CSS rules (to \\.
).
Formal syntax
@document [ <url> | url-prefix(<string>) | domain(<string>) | regexp(<string>) ]# { <group-rule-body> }
Examples
@document url(http://www.w3.org/), url-prefix(http://www.w3.org/Style/), domain(mozilla.org), regexp("https:.*") { /* CSS rules here apply to: - The page "http://www.w3.org/". - Any page whose URL begins with "http://www.w3.org/Style/" - Any page whose URL's host is "mozilla.org" or ends with ".mozilla.org" - Any page whose URL starts with "https:" */ /* make the above-mentioned pages really ugly */ body { color: purple; background: yellow; } }
Specifications
Initially in CSS Conditional Rules Module Level 3, @document
has been postponed to Level 4.
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | No support | 1.5 (1.8)-moz | No support | No support | No support |
regexp() |
No support | 6.0 (6.0)-moz | No support | No support | No support |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | ? | ? | ? | ? | ? | ? |
regexp() |
No support | No support | ? | No support | No support | No support |
See also
- Per-site user style sheet rules on the www-style mailing list.
- The file
userContent.css
is a user stylesheet on Gecko-based browsers.