[Webkit-unassigned] [Bug 113051] New: Flexbox can cause big paint in some circumstances

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=113051

           Summary: Flexbox can cause big paint in some circumstances
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: hasather+webkitbugs at gmail.com


In some circumstances, an absolutely positioned element with `display: flexbox` will cause a large paint (bottom right position of the element to the top left position of the viewport in Chrome, less in Safari, but still a larger area than the element itself).

Attaching a testcase which is about as minimal as I could get it. To verify, open Web Inspector and use "Show paint rectangles" (or the Timeline), and hover the element that says "Hover". (The existence of opacity also seems to influence this, I don't see the same thing if I only change the background-color on hover for example.)

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.