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<!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>
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