tree cdff97edfff184c4db3d32f9782a885964d44a94
parent 7278e56dd854b8d3719e06c432a64f42887473ff
author simon.fraser@apple.com <simon.fraser@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1634380518 +0000
committer simon.fraser@apple.com <simon.fraser@apple.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1634380518 +0000

Make sure child layers of top layer elements are rendered and correctly z-ordered (top-layer-stacking.html fails)
https://bugs.webkit.org/show_bug.cgi?id=231832

Reviewed by Antoine Quint.
Source/WebCore:

Top layer elements should create CSS stacking context, per https://fullscreen.spec.whatwg.org/#rendering

I decided to call isInTopLayerOrBackdrop() twice to avoid calling it every time this function
is called. It's a cheap function.

Test: fast/layers/dialog-is-stacking-context.html

* style/StyleAdjuster.cpp:
(WebCore::Style::Adjuster::adjust const):

LayoutTests:

Ref test that compares a dialog with positioned children and one with children place
with margins.

* fast/layers/dialog-is-stacking-context-expected.html: Added.
* fast/layers/dialog-is-stacking-context.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@284314 268f45cc-cd09-0410-ab3c-d52691b4dbfc