Bug 254820

<rdar://problem/107475107>

Created attachment 465702 [details] Diff of test case Expectations changed from "{Something} auto" to just "{Something}"

Renaming the title See http://wpt.live/css/css-backgrounds/background-size-001.html https://wpt.fyi/results/css/css-backgrounds/background-size-001.html With ``` data:text/html,<div id="test"></div> ``` and doing in the console. ``` > document.document.querySelector("#test").style.backgroundSize = "0px"; < "0px" > window.getComputedStyle(document.querySelector("#test")).getPropertyValue("background-size") < "0px auto" > window.getComputedStyle(document.querySelector("#test")).backgroundSize < "0px auto" ``` it should return `0px` only.

Probably done here. https://searchfox.org/wubkat/rev/d45649fa32a499702c30474e94bd6843c4c67849/Source/WebCore/css/ComputedStyleExtractor.cpp#2440-2453

This test is being contradicted by https://wpt.fyi/results/css/css-backgrounds/parsing/background-size-computed.html

I have a fix for adjusting to http://wpt.live/css/css-backgrounds/background-size-001.html

So wait, there are a couple of things to change in fact. WebKit has the correct behavior in this instance, but some tests need to be modified. Tim added it to the CSS WG agenda Agenda+ to https://github.com/w3c/csswg-drafts/issues/7802 and see for previous discussions https://github.com/WebKit/WebKit/pull/3372

Pull request: https://github.com/WebKit/WebKit/pull/37148

Committed 287112@main (3d8628034199): <https://commits.webkit.org/287112@main> Reviewed commits have been landed. Closing PR #37148 and removing active labels.