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<!doctype html>
<html>
<head>
<meta charset=utf-8>
<title>CSS Transitions Test: Transitions do not run for a pseudo-element that is not being rendered</title>
<link rel="help" title="Starting transitions"
href="https://drafts.csswg.org/css-transitions/#starting">
<script src="/resources/testharness.js" type="text/javascript"></script>
<script src="/resources/testharnessreport.js" type="text/javascript"></script>
<script src="./support/helper.js" type="text/javascript"></script>
</head>
<body>
<div id="log"></div>
<script>
promise_test(async t => {
for (const pseudoType of ['before', 'after']) {
const style = addStyle(t, {
[`.init::${pseudoType}`]: 'content: ""; width: 0px; transition: width 100s;',
[`.change::${pseudoType}`]: 'width: 100px;',
[`.cancel::${pseudoType}`]: 'content: none',
});
// Create element (and pseudo-element) and attach event listeners
const div = addDiv(t);
div.classList.add('init');
const eventWatcher = new EventWatcher(t, div, [
'transitionrun',
'transitioncancel',
]);
// Trigger transition
getComputedStyle(div).width;
div.classList.add('change');
getComputedStyle(div).width;
await eventWatcher.wait_for('transitionrun');
// Make the pseudo-element no longer rendered
div.classList.add('cancel');
await eventWatcher.wait_for('transitioncancel');
div.remove();
style.remove();
}
}, 'Transitions on ::before/::after pseudo-elements are canceled when the'
+ ' content property is cleared');
</script>
</body>
</html>
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