Bug 207439

Summary:	conic-gradient() incorrectly accepts unitless zero angles
Product:	WebKit	Reporter:	Emilio Cobos Álvarez (:emilio) <emilio>
Component:	CSS	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED INVALID
Severity:	Normal	CC:	koivisto, simon.fraser
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
See Also:	https://bugs.webkit.org/show_bug.cgi?id=205733

Description Emilio Cobos Álvarez (:emilio) 2020-02-09 06:32:11 PST

Safari accepts `document.body.style.backgroundImage = "conic-gradient(yellow 0, blue 360deg)"` and so on.

I think that's invalid per spec. I don't see anything in https://drafts.csswg.org/css-images-4/#funcdef-conic-gradient which would say that zero is a valid angle value in this context.

See https://bugs.chromium.org/p/chromium/issues/detail?id=1050395 too.

Comment 1 Emilio Cobos Álvarez (:emilio) 2020-02-09 06:36:51 PST

Err, apparently https://drafts.csswg.org/css-images-4/#valdef-conic-gradient-angle does mention unitless zero. Oh well, kinda unfortunate.