[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

Mathieu HAYS <haysmathieu at gmail.com> changed:

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                 CC|                            |haysmathieu at gmail.com

--- Comment #6 from Mathieu HAYS <haysmathieu at gmail.com> ---
Hi,

I've got a similar issue when the element being clipped is contained within another element having position:fixed and overflow:hidden.

Testcase: 
https://codepen.io/mathieuhays/pen/oWYvvm

Expected Result: 
The child element (with green background) should be visible on the right hand side.

Actual Result: 
The child element is not visible.

The above works on IE, Chrome, Firefox, Opera but not on Safari including the latest webkit nightly build. I've also tested the latest Safari on iPhone and the issue is reproducible there too.

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