Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 681c0a0ad8ad1cdcc78ee7d0ceded7bcc624ea86
https://github.com/WebKit/WebKit/commit/681c0a0ad8ad1cdcc78ee7d0ceded7bcc624ea86
Author: Alan Baradlay <[email protected]>
Date: 2026-09-08 (Tue, 08 Sep 2026)
Changed paths:
A
LayoutTests/imported/w3c/web-platform-tests/css/css-text/white-space/reference/tab-stop-threshold-007-ref.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-text/white-space/tab-stop-threshold-007-expected.html
A
LayoutTests/imported/w3c/web-platform-tests/css/css-text/white-space/tab-stop-threshold-007.html
M Source/WebCore/platform/graphics/FontCascadeInlines.h
Log Message:
-----------
Tab character renders too narrow when tab-size is small (proportional fonts)
https://bugs.webkit.org/show_bug.cgi?id=323466
<rdar://problem/186698040>
Reviewed by Antti Koivisto.
<div style="font: 32px serif; white-space: pre; tab-size:
0.4ch">			</div>
Each tab should advance to the second tab stop, making the run 2.4ch wide.
Instead it advanced to the first one and the run was 1.2ch.
A tab is not a glyph but a shift to the next tab stop, and a shift too short to
read as a tab takes the subsequent stop instead.
The spec measures "too short" against 0.5ch, half the advance of the "0" glyph,
while we measured it against the space character.
In a proportional font the space is a lot narrower than the "0" (2.2px vs 4px
in 16px Times)
*
LayoutTests/imported/w3c/web-platform-tests/css/css-text/white-space/reference/tab-stop-threshold-007-ref.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-text/white-space/tab-stop-threshold-007-expected.html:
Added.
*
LayoutTests/imported/w3c/web-platform-tests/css/css-text/white-space/tab-stop-threshold-007.html:
Added.
* Source/WebCore/platform/graphics/FontCascadeInlines.h:
(WebCore::FontCascade::tabWidth):
Canonical link: https://commits.webkit.org/320671@main
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