testing/web-platform/tests/longtask-timing/resources/subframe-with-longtask.html


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<!DOCTYPE HTML>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width">

<title>Long Task Iframe</title>
<h1>Long Task in Inline Script</h1>

<script>
    const begin = window.performance.now();
    while (window.performance.now() < begin + 60);
</script>