[Webkit-unassigned] [Bug 119479] New: Inserting a JS generated keyframe animation shouldn't trigger a whole document style recalc

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119479

           Summary: Inserting a JS generated keyframe animation shouldn't
                    trigger a whole document style recalc
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ralpht+bugs at gmail.com
                CC: akling at apple.com, ralpht+bugs at gmail.com


Created an attachment (id=208099)
 --> (https://bugs.webkit.org/attachment.cgi?id=208099&action=review)
Example of adding an animation via JS which triggers a whole document style recalc

Inserting a keyframe animation created in JS causes a full style recalc which can be very expensive on large documents. WebKit doesn't start an animation if it was referenced by a node prior to inserting it, so hopefully it's possible to add a custom keyframe animation for only the time it takes to parse it.

The attached example causes a longer style recalc (on L26) when the keyframe rule is added.

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