[Webkit-unassigned] [Bug 162232] New: Fullscreen elements render improperly if they have a parent with animated 'translate'

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=162232

            Bug ID: 162232
           Summary: Fullscreen elements render improperly if they have a
                    parent with animated 'translate'
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: a at monks.co
                CC: simon.fraser at apple.com

Example URL: http://codepen.io/amonks/pen/GjjdoA

Steps to reproduce the problem:
1. Open the link above
2. Fullscreen the embedded Youtube player

What is the expected behavior?
The youtube player is shown in the fullscreen

What went wrong?
The youtube player is constrained within its ancestor.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? No

Does this work in other browsers? Yes. Both webkit and blink show this error, but firefox renders correctly.

Here's a reference to the same bug in chromium's tracker: https://bugs.chromium.org/p/chromium/issues/detail?id=501246

I copied-and-pasted most of this text from there.

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