Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 2d5bf1919563cafb8fe4139eb04a381e309c9149
https://github.com/WebKit/WebKit/commit/2d5bf1919563cafb8fe4139eb04a381e309c9149
Author: Alan Baradlay <[email protected]>
Date: 2026-01-09 (Fri, 09 Jan 2026)
Changed paths:
M
LayoutTests/imported/w3c/web-platform-tests/css/css-flexbox/position-relative-percentage-top-001.html
Log Message:
-----------
[subpixel-inline-layout] Test cases rely on specific default font metrics
(part2)
https://bugs.webkit.org/show_bug.cgi?id=305215
Reviewed by Simon Fraser.
An inline box's (e.g. <label>) offsetTop is computed from the geometry of its
generated display boxes.
In this case, the first (and only) display box for the inline box has a 0.5px
block-direction offset,
which corresponds to the half-leading introduced by the 1px line gap on iOS
(default font).
It means that even 'position: relative; top: 0px' (note the 0px) would put the
before side of the inline box at 0.5px.
_____________________ block edge
||-------------------- line box edge (note that it's flush with the block edge)
|| ^
|| | 0.5px (half leading)
|| __v________________ inline box edge (<label>)
|||
||| some text content
|||
Fix this ambiguity by using Ahem font (alternatively we could make the <label>
display: block).
*
LayoutTests/imported/w3c/web-platform-tests/css/css-flexbox/position-relative-percentage-top-001.html:
Canonical link: https://commits.webkit.org/305394@main
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