display-none-dont-cancel-pseudo.tentative.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/css-animations/display-none-dont-cancel-pseudo.tentative.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<link rel=author href="mailto:graouts@apple.com">

<link rel=help href="https://drafts.csswg.org/css-display-4/#display-animation">

<link rel=help href="https://github.com/w3c/csswg-drafts/issues/10111">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="/web-animations/testcommon.js"></script>

<style>

@keyframes display-animation {

  from { margin-left: 100px; display: block }

  to   { margin-left: 200px; display: none }

.target::after {

  content: "";

  margin-left: 50px;

.target.animated::after {

  animation: display-animation 1ms forwards;

</style>

<body>

<script>

promise_test(async t => {

  const target = createDiv(t);

  target.className = "target";

  const cs = getComputedStyle(target, "::after");

  const animations = () => target.getAnimations({ subtree: true });

  assert_equals(animations().length, 0, "There are no running animations initially");

  assert_equals(cs.marginLeft, "50px");

  assert_equals(cs.display, "inline");

  target.classList.add("animated");

  const runningAnimations = animations();

  assert_equals(runningAnimations.length, 1, "Setting the 'animated' class started an animation");

  assert_equals(cs.marginLeft, "100px");

  assert_equals(cs.display, "block");

  await runningAnimations[0].finished;

  assert_equals(animations().length, 1, "The animation remains after completion");

  assert_equals(cs.marginLeft, "200px");

  assert_equals(cs.display, "none");

}, 'A CSS Animation on a pseudo-element animating to "display: none" with "fill: forwards" remains active after animation completion.');

</script>

</body>