Bug 285404

Summary:

Assertion when using any of the following units with canvas ctx.letterSpacing/ctx.wordSpacing: lh, rlh, cqw, cqh, cqi, cqb, cqmin, cqmax

Product:

WebKit

Reporter:

Sam Weinig <sam>

Component:

New Bugs

Assignee:

Sam Weinig <sam>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari 18

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Test case (will assert in debug builds)	none

Sam Weinig

Reported 2025-01-05 13:16:34 PST

WebKit will assert when using any of the following units with canvas ctx.letterSpacing/wordSpacing (lh, rlh, cqw, cqh, cqi, cqb, cqmin, cqmax).

Attachments
Test case (will assert in debug builds) (810 bytes, text/html) 2025-01-05 13:41 PST, Sam Weinig	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Sam Weinig

Comment 1 2025-01-05 13:41:04 PST

The HTML spec doesn't say what these units (or really any <length> units) should do, so for now, just going to make non-absolute and non-font-relative units bail. Filed https://github.com/whatwg/html/issues/10893 for HTML spec issue.

Sam Weinig

Comment 2 2025-01-05 13:41:51 PST

Created attachment 473783 [details] Test case (will assert in debug builds)

Sam Weinig

Comment 3 2025-01-05 13:59:43 PST

Pull request: https://github.com/WebKit/WebKit/pull/38547

EWS

Comment 4 2025-01-06 09:04:16 PST

Committed 288468@main (ddefac0cb41f): <https://commits.webkit.org/288468@main> Reviewed commits have been landed. Closing PR #38547 and removing active labels.

Radar WebKit Bug Importer

Comment 5 2025-01-06 09:05:15 PST

<rdar://problem/142420240>

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