[Webkit-unassigned] [Bug 138162] New: translate3d(0, 0, 0) rendering bug on iOS 8

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=138162

            Bug ID: 138162
           Summary: translate3d(0,0,0) rendering bug on iOS 8
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: iOS
                OS: iOS 7.0
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at rebertia.com

Created attachment 240582
  --> https://bugs.webkit.org/attachment.cgi?id=240582&action=review
GIF video of the bug occurring

Original Bootstrap bug report: https://github.com/twbs/bootstrap/pull/14603

To repro:
1. Open iOS Simulator for iPad 2 + iOS 8
2. Open Safari in the simulator
3. Open http://jsbin.com/dukoxo/1 in Safari
4. Zoom in on the navbar
5. Click/tap the left "Dropdown", then the right "Dropdown". (Note that a menu appears below the clicked "Dropdown".)
6. (You might need to repeat #5 a couple times)
7. The menu that appears below the right Dropdown will misrender, with a white rectangle obscuring the right half of the menu.

See also the GIF video in this comment: https://github.com/twbs/bootstrap/pull/14603#issuecomment-56440223

The bug is provoked by this portion of the page's CSS:

.navbar-fixed-top,
.navbar-fixed-bottom
{
  -webkit-transform: translate3d(0, 0, 0);
          transform: translate3d(0, 0, 0);
}


Removing these translate3d transforms avoids the bug.

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