[Webkit-unassigned] [Bug 83663] New: regression(r104445): style is not recomputed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=83663

           Summary: regression(r104445): style is not recomputed
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mikelawther at chromium.org
                CC: koivisto at iki.fi, kling at webkit.org


Created an attachment (id=136628)
 --> (https://bugs.webkit.org/attachment.cgi?id=136628&action=review)
reproduction

As reported at http://crbug.com/122663:

A dynamically updated style is not recomputed, resulting in a page element appearing twice. This attached repro is not minimal, but it is breaking a live site.

Note that opening the inspector causes the page to recalculate and the error disappears.

I bisected WebKit Nightly on MacOS and got 

Works: r104428  Fails: r104450
http://trac.webkit.org/log/trunk/?rev=104450&stop_rev=104429

I reckon r104445 is the most likely in this range.

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