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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Starting an animation with a scroll timeline in a removed iframe
should not crash</title>
</head>
<body>
<div id="target"></div>
<iframe id="frame"></iframe>
</body>
<script type="text/javascript">
const target = document.getElementById('target');
const frame = document.getElementById('frame');
const timeline = new frame.contentWindow.ScrollTimeline();
frame.remove();
target.animate(null, {timeline: timeline});
</script>
</html>