Bug 247298

Summary:	Don't apply aspect ratio scaling to gradient images without a natural aspect ratio
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Matt Woodrow <mattwoodrow>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Matt Woodrow 2022-10-31 17:06:24 PDT

If we use a gradient as a background image, and set one of the background size dimension to auto, we currently scale that dimension by the same amount as the other axis to preserve the aspect ratio.

Gradients have no natural dimensions (and thus no natural aspect ratio) - https://w3c.github.io/csswg-drafts/css-images/#gradients.

Background sizing should fall back to using 100% (for the case where we have one size, and auto), if there's no natural aspect ratio or dimensions - https://w3c.github.io/csswg-drafts/css-backgrounds/#background-size

<rdar://101661731>

Comment 1 Matt Woodrow 2022-10-31 17:15:12 PDT

Pull request: https://github.com/WebKit/WebKit/pull/5987

Comment 2 EWS 2022-11-02 16:30:16 PDT

Committed 256256@main (759576401a3d): <https://commits.webkit.org/256256@main>

Reviewed commits have been landed. Closing PR #5987 and removing active labels.