Bug 51172

Summary: Implement @-webkit-document CSS rule for use in user stylesheets
Product: WebKit Reporter: Mathias Bynens <mathias@qiwi.be>
Component: CSSAssignee: Nobody <webkit-unassigned@lists.webkit.org>
Severity: Normal CC: ap@webkit.org, hyatt@apple.com, jason.barnabe@gmail.com, kenwfoyjr@lavabit.com, mathias@qiwi.be, mitz@webkit.org, mkterra@gmail.com, peter@chromium.org, pf@parb.es, ronan@jouchet.fr, syoichi@outlook.com, tony@chromium.org
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
URL: https://developer.mozilla.org/en/CSS/@-moz-document

Description From 2010-12-16 02:35:49 PST
Something similar to @-moz-document <https://developer.mozilla.org/en/CSS/@-moz-document> would make it *much* easier to write and use custom user stylesheets.

Also see <http://lists.w3.org/Archives/Public/www-style/2004Aug/0135>.
------- Comment #1 From 2010-12-16 12:04:00 PST -------
Pasting from the provided URL:

The @-moz-document rule is a Gecko-specific at-rule that restricts the style rules contained within it based on the URL of the document. It is designed primarily for user style sheets.

@-moz-document url(http://www.w3.org/),  
  /* 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 

  /* make the above-mentioned pages really ugly */  
  body { color: purple; background: yellow; }  
------- Comment #2 From 2010-12-16 15:13:50 PST -------
If at all possible, supporting @-moz-document itself would be vastly preferable.  That way, existing styles will work without users having to wait for updates, and authors won't have to maintain two superficially-different versions for Gecko and Webkit.
------- Comment #3 From 2010-12-17 00:39:27 PST -------
They're called vendor prefixes for a reason. While it would indeed benefit convenience for using user-stylesheets, I'd consider it a bad thing to support another vendor's prefix.
------- Comment #4 From 2011-05-16 06:25:35 PST -------
FYI, someone created a userscript that partially does the job:

This doesn't mean this bug is fixed, but it can be used as a workaround in the meantime.
------- Comment #5 From 2011-09-06 11:05:57 PST -------
This is now included in the CSS Conditional Rules Module Level 3 draft: http://www.w3.org/TR/css3-conditional/#at-document
------- Comment #6 From 2012-01-02 23:15:09 PST -------
*** Bug 75456 has been marked as a duplicate of this bug. ***