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Starred by 6 users
Status: Fixed
Closed: Apr 2013
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Pri: 2
Type: Launch-OWP
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Blocked on:
issue 227103

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Implement css3-conditional's @supports rule
Project Member Reported by, Aug 3 2012 Back to list
(See for an overview)

*High-level description of the change (1-2 sentences):*
From the wkbug: The ‘@supports’ rule is a conditional group rule whose condition tests whether the user agent supports CSS property:value pairs.

*Listing of additions/modifications/changes to API surface (bullet
Adding @support conditional blocks to CSS

Not yet landed, which is why I'm targeting this at a future milestone.
Additional context (fill in as much as you can, or link to a prior API
launch bug with the context):
*Link to relevant webkit or crbug:*

*Link to relevant public standards discussion:*

*Support in other browsers (current and expected):*
Internet Explorer: NO
Firefox: YES (
Safari: NO
Opera: SOON (

Make sure to fill in any labels with a -?. Feel free to leave other labels
at the defaults.

Comment 1 by, Oct 29 2012
Status: Fixed
Comment 2 by, Oct 30 2012
Labels: -Mstone-24 Mstone-25
Status: Started
The feature is available in WebKit, but we don't compile in the code yet (see Source/WebKit/chromium/features.gypi in WebKit). It's still disabled.

Moved to M25.
Comment 3 by, Nov 8 2012
Landed with
Comment 4 by, Nov 8 2012
Oops, actually landed in
Comment 5 by, Nov 8 2012
Comment 6 by, Nov 8 2012
Status: Fixed
Comment 7 by, Nov 21 2012
Labels: -Mstone-25 Mstone-X
Unclear when this will be enabled, moving to Mstone-X.
Comment 8 by, Nov 29 2012
Status: Assigned
Comment 9 by, Dec 10 2012
For reference, Opera now supports this:
Comment 10 by, Dec 12 2012
Labels: WebKit-ID-104795
I filed to track this on the WebKit side.
Project Member Comment 11 by, Dec 12 2012
Labels: -WebKit-ID-104795 WebKit-ID-104795-NEW
Project Member Comment 12 by, Dec 12 2012
Labels: -WebKit-ID-104795-NEW WebKit-ID-104795-ASSIGNED
Project Member Comment 13 by, Mar 9 2013
Labels: -OWP-DesignReview-No OWP-Design-No
Comment 14 by, Mar 15 2013
Labels: -Mstone-X -Pri-3 M-27 Pri-2
Comment 15 by, Mar 15 2013
Labels: -M-27 M-X
Comment 16 by, Mar 15 2013
 Issue 196699  has been merged into this issue.
Blockedon: chromium:227103
Comment 18 by, Apr 22 2013
Labels: -OWP-Standards-UnofficialSpec -M-X -WebKit-ID-104795-ASSIGNED OWP-Standards-OfficialSpec M-28
Status: Fixed
This feature landed in the following revision.  Marking this as fixed.
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