<!doctype html>
<meta charset=utf-8>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../testcommon.js"></script>
<style>
div.pseudo::before {
  animation: animation 1s;
  content: 'content';
}
@keyframes animation {
  to { opacity: 0 }
}
</style>
<body>
<div id="log"></div>
<script>
'use strict';

// Tests for cases where we may not have style data for an element

promise_test(async t => {
  // Get a CSSPseudoElement
  const div = addDiv(t, { class: 'pseudo' });
  const cssAnim = document.getAnimations()[0];
  const pseudoElem = cssAnim.effect.target;

  // Drop pseudo from styles and flush styles
  div.classList.remove('pseudo');
  getComputedStyle(div, '::before').content;

  // Try animating the pseudo's content attribute
  const contentAnim = pseudoElem.animate(
    { content: ['none', '"content"'] },
    { duration: 100 * MS_PER_SEC, fill: 'both' }
  );

  // Check that the initial value is as expected
  await contentAnim.ready;
  assert_equals(getComputedStyle(div, '::before').content, 'none');

  contentAnim.finish();

  // Animating an obsolete pseudo element should NOT cause the pseudo element
  // to be re-generated. That behavior might change in which case this test
  // will need to be updated. The most important part of this test, however,
  // is simply checking that nothing explodes if we try to animate such a
  // pseudo element.

  assert_equals(getComputedStyle(div, '::before').content, 'none');
}, 'Animation on an obsolete pseudo element produces expected results');

</script>
</body>
