[Webkit-unassigned] [Bug 218910] New: Value of animation at time 0 does not match Firefox (or WPT test expectations) for color accumulate composite test

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218910

            Bug ID: 218910
           Summary: Value of animation at time 0 does not match Firefox
                    (or WPT test expectations) for color accumulate
                    composite test
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sam at webkit.org
                CC: dino at apple.com

Created attachment 414056

  --> https://bugs.webkit.org/attachment.cgi?id=414056&action=review

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

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