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+<!doctype html>
+<html>
+<head>
+<meta charset=utf-8>
+<title>CSS Transitions Test: Transitions do not run for a ::marker-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 => {
+ addStyle(t, {
+ '.init::marker': 'content: ""; color: red; transition: color 100s;',
+ '.change::marker': 'color: green',
+ });
+
+ // Create element (and pseudo-element) and attach event listeners
+ const div = addDiv(t, { 'style': 'display: list-item' });
+ div.classList.add('init');
+
+ const eventWatcher = new EventWatcher(t, div, [
+ 'transitionrun',
+ 'transitioncancel',
+ ]);
+
+ // Trigger transition
+ getComputedStyle(div).color;
+ div.classList.add('change');
+ getComputedStyle(div).color;
+
+ await eventWatcher.wait_for('transitionrun');
+
+ // Make the parent element no longer display: list-item so that the pseudo
+ // element no longer renders
+ div.style.display = 'block';
+
+ await eventWatcher.wait_for('transitioncancel');
+}, 'Transitions on ::marker pseudo-elements are canceled when the'
+ + ' parent display type is no longer list-item');
+</script>
+
+</body>
+</html>