Bug 260781

Summary:	[Interop 2021][CSS Transforms] css/css-transforms/transform-rotate-003.html and transform-rotate-005.html fail
Product:	WebKit	Reporter:	Matt Woodrow <mattwoodrow>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	NEW
Severity:	Normal	CC:	bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Matt Woodrow

Reported 2023-08-27 20:30:15 PDT

Looks like these only fail on WPT.fyi, not in our infrastructure. Looks like very very subtle differences due to float/double precision when combining multiple transforms.

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Radar WebKit Bug Importer

Comment 1 2023-08-27 20:30:23 PDT

<rdar://problem/114542837>

Matt Woodrow

Comment 2 2023-08-27 20:32:49 PDT

We could potentially use float precision instead of double, which would hopefully cause these to end up identical. Alternatively, we could use precomputed sin/cos values for 'common' degree values. We could also just fuzz the tests (more), since the rendering is visually identical.

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