[Webkit-unassigned] [Bug 246913] New: [web-animations] commitStyles() should update layout prior to committing animations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246913

            Bug ID: 246913
           Summary: [web-animations] commitStyles() should update layout
                    prior to committing animations
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at webkit.org
                CC: dino at apple.com, graouts at apple.com

We're failing a subtest in web-animations/interfaces/Animation/commitStyles.html:

test(t => {
  const div = createDiv(t);
  div.style.width = '200px';
  div.style.height = '200px';

  const animation = div.animate({ transform: ["translate(100%, 0%)", "scale(3)"] }, 1000);
  animation.currentTime = 500;
  animation.commitStyles();
  animation.cancel();

  assert_equals(getComputedStyle(div).transform, "matrix(2, 0, 0, 2, 100, 0)",
      "Resolved transform is correct after commit.");
}, 'Commits matrix-interpolated relative transforms');

Our current result is "matrix(2, 0, 0, 2, 0, 0)" because when we blend under commitStyles() layout has not happened yet for the div and the bounds passed to resolve the 100% translation value is 0,0.

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