Bug 301410

Summary:

text-decoration-thickness and text-underline-offset not workin in vertical writing

Product:

WebKit

Reporter:

Bobby (Fu-Hsin) Tung <bobbytung>

Component:

Text

Assignee:

alan <zalan>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

ahmad.saleem792, fantasai.bugs, koivisto, vitor.roriz, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 26

Hardware:

All

OS:

All

Bug Depends on:

301672

Bug Blocks:

Attachments:

Description	Flags
a vertical writing html, you can change vrtl to hltr to see horizontal writing results	none
Test reduction	none
Patch	ews-feeder: commit-queue-
Patch	none
[fast-cq]Patch	none

Bobby (Fu-Hsin) Tung

Reported 2025-10-23 23:24:43 PDT

Created attachment 477186 [details] a vertical writing html, you can change vrtl to hltr to see horizontal writing results I've used text-decoration-thickness and text-underline-offset to design ebook emphasis as highlight. Safari and Chrome used to render same result, however Safari changed behavior to draw a thin line instead. And there's no problem in horizontal writing text, but not working in vertical writing.

Attachments
a vertical writing html, you can change vrtl to hltr to see horizontal writing results (5.95 KB, application/xhtml+xml) 2025-10-23 23:24 PDT, Bobby (Fu-Hsin) Tung	no flags	Details
Test reduction (246 bytes, text/html) 2025-10-28 14:32 PDT, alan	no flags	Details
Patch (2.54 KB, patch) 2025-10-29 07:27 PDT, alan	ews-feeder: commit-queue-	Details Formatted Diff Diff
Patch (2.91 KB, patch) 2025-10-29 20:01 PDT, alan	no flags	Details Formatted Diff Diff
[fast-cq]Patch (2.91 KB, patch) 2025-10-30 08:22 PDT, alan	no flags	Details Formatted Diff Diff
Show Obsolete (2) View All Add attachment proposed patch, testcase, etc.