RESOLVED CONFIGURATION CHANGED 218910
Value of animation at time 0 does not match Firefox (or WPT test expectations) for color accumulate composite test 
https://bugs.webkit.org/show_bug.cgi?id=218910
Summary Value of animation at time 0 does not match Firefox (or WPT test expectations...
Sam Weinig
Reported 2020-11-13 09:49:10 PST
Created attachment 414056 [details] Reduced Test Case The value of animation at time 0 does not match Firefox (or WPT test expectations) for color accumulate composite test. Reduced test case attached. ` target.style[idlName] = 'rgb(128, 128, 128)'; const animation = target.animate({ [idlName]: ['rgb(255, 0, 0)', 'rgb(0, 0, 255)'] }, { duration: 1000, composite: 'accumulate' }); testAnimationSamples(animation, idlName, [{ time: 0, expected: 'rgb(255, 128, 128)' }]); ` This reduction was extracted from http://wpt.live/web-animations/animation-model/animation-types/accumulation-per-property-002.html
Attachments
Reduced Test Case (1.09 KB, text/html)
2020-11-13 09:49 PST, Sam Weinig 		no flags
Details
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Radar WebKit Bug Importer
Comment 1 2020-11-20 09:50:15 PST
<rdar://problem/71631573>
Antoine Quint
Comment 2 2020-11-21 00:38:47 PST
Since we don't support composite operations (bug 189299), I expect instead of accumulating over the base value we are replacing it entirely.
Ahmad Saleem
Comment 3 2022-09-02 16:15:11 PDT
Attached test case show following for all browsers (Chrome Canary 107, Firefox Nightly 106 and Safari Technology Preview 152): PASS The value should be rgb(255, 128, 128) at 0ms The value is rgb(255, 128, 128) at 0ms Is anything else needed here? WPT Live link test still has 20 failures in STP 152, 1 in Firefox Nightly 106 and 12 in Chrome Canary 107.
Antoine Quint
Comment 4 2022-09-12 07:12:27 PDT
Yes, since composite operations are now supported, this particular issue seems addressed.
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