[Webkit-unassigned] [Bug 247884] New: [css-transitions] setting transition-property to "none" does not disassociate CSS Transition from owning element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247884

            Bug ID: 247884
           Summary: [css-transitions] setting transition-property to
                    "none" does not disassociate CSS Transition from
                    owning element
           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 are failing a subtest in web-animations/timing-model/timelines/update-and-send-events-replacement.html:

promise_test(async t => {
  // Setup transition
  const div = createDiv(t);
  div.style.opacity = '0';
  div.style.transition = 'opacity 1ms';
  getComputedStyle(div).opacity;
  div.style.opacity = '1';
  const cssTransition = div.getAnimations()[0];
  cssTransition.effect.updateTiming({ fill: 'forwards' });

  // Break tie to markup
  div.style.transitionProperty = 'none';
  assert_equals(cssTransition.playState, 'idle');

  // Restart transition
  cssTransition.play();

  const scriptAnimation = div.animate(
    { opacity: 1 },
    {
      duration: 1,
      fill: 'forwards',
    }
  );
  await scriptAnimation.finished;

  assert_equals(cssTransition.replaceState, 'removed');
  assert_equals(scriptAnimation.replaceState, 'active');
}, 'Removes a CSS transition no longer tied to markup');

We fail the second-to-last assertion because we do not correctly disassociate a CSS Transition from its owning element when transition-property is set to "none" and thus do not mark that transition as replaceable.

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