Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 6246be93facfdbea4ecd3f5ad62362dc4edd8ddf
https://github.com/WebKit/WebKit/commit/6246be93facfdbea4ecd3f5ad62362dc4edd8ddf
Author: Alan Baradlay <[email protected]>
Date: 2026-05-16 (Sat, 16 May 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-position/position-relative-016-expected.txt
A
LayoutTests/imported/w3c/web-platform-tests/css/css-position/position-relative-016.html
M Source/WebCore/rendering/RenderBoxModelObject.cpp
Log Message:
-----------
"Reveal password" button in schwab.com login field is misplaced
https://bugs.webkit.org/show_bug.cgi?id=314918
rdar://177181803
Reviewed by Antti Koivisto.
<div style="position: relative">
x<div style="position: absolute; height: 100%">
<div style="position: relative; top: 100%">green</div>
</div>
</div>
The green box should be one line below "x". Instead it sat on top of it.
When the inner relpos resolves "top: 100%", the post-layout fast path
added in 311908@main walks up from the absolute box looking for a
definite-height ancestor, sees "height: auto" on the outer relative
div, and answers "not definite", so the percentage falls back to zero.
But the absolute box itself has "height: 100%", and an out-of-flow
containing block always gets computed used dimensions regardless of an
ancestor's style. The slow path bailed early for out-of-flow in
containingBlockForAutoHeightDetection; the fast path missed it.
Treat an out-of-flow containing block with a non-auto height (percent
or stretch) as definite in hasDefiniteHeightByStyle, matching the slow
path's out-of-flow early-bail.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-position/position-relative-016-expected.txt:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-position/position-relative-016.html:
Added.
* Source/WebCore/rendering/RenderBoxModelObject.cpp:
(WebCore::hasDefiniteHeightByStyle):
Canonical link: https://commits.webkit.org/313364@main
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