Bug 252925 – REGRESSION (STP 164): new failure in css/css-backgrounds/parsing/background-shorthand-serialization.html

• Component: CSS
• Status: RESOLVED FIXED

[Antoine Quint]

The last subtest of css/css-backgrounds/parsing/background-shorthand-serialization.html is failing in STP 164 when it used to pass in STP 163:

https://wpt.fyi/results/css/css-backgrounds/parsing/background-shorthand-serialization.html?label=master&label=experimental&product=safari-163%20preview&product=safari-164%20preview&view=subtest

We need to find out if this is a bug in WebKit or an issue with the test. We should also take the opportunity to import this test so this could be caught with EWS going forward.

[Darin Adler]

The issue here is "transparent" vs. "none" for the default background which can be specified many ways, including "background: transparent" and "background: none".

[Darin Adler]

Tim filed this https://github.com/w3c/csswg-drafts/issues/8496

[Darin Adler]

We can just assume that we want this to serialize as "none" and fix it right away rather than waiting for the issues to be resolved. The fix is really easy:

1) Move "background-color" to the end of the list of longhands in CSSProperties.json for "background".

2) Rebase all the tests that change results.

[Radar WebKit Bug Importer]

<rdar://problem/106208628>

[Darin Adler]

Pull request: https://github.com/WebKit/WebKit/pull/11087

[EWS]

Committed 261250@main (bec59bdd1e26): <https://commits.webkit.org/261250@main>

Reviewed commits have been landed. Closing PR #11087 and removing active labels.