[Webkit-unassigned] [Bug 160953] WebKit incorrectly clips position:fixed element, inside of its "position:relative; overflow: hidden" parent, IF that parent has "z-index" set

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=160953

Stefan Seiz <seiz at imd.net> changed:

           What    |Removed                     |Added
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                 CC|                            |seiz at imd.net

--- Comment #7 from Stefan Seiz <seiz at imd.net> ---
Created attachment 323520

  --> https://bugs.webkit.org/attachment.cgi?id=323520&action=review

Testcase

I have the same issue, even in Safari 11.0 (high sierra) as well as in Safari Technology preview.

In my testcase, you see a fullscreen image (background) with position fixed gets clipped by overflow hidden. If you view the testcase in Chrome, you'll see the image cover the whole browser window.

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