<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Layout Instability entries are not available via the performance timeline</title>
<body>
<style>
#myDiv { position: relative; width: 300px; height: 100px; background: blue; }
</style>
<div id='myDiv'></div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<script>
promise_test(async t => {
  assert_implements(window.LayoutShift, 'Layout Instability is not supported.'