<!DOCTYPE HTML>
<meta charset=utf-8>
<title>LongTask Timing: long task in sibling iframe</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
window.addEventListener('message', t.step_func(e => {
assert_equals(e.data, 'longtask+same-origin+script+child-iframe-id+' +
'child-iframe-name+resources/subframe-with-longtask.html');
t.done();
}));
}, 'Performance longtask entries in parent are observable in child iframe.');
</script>
<iframe src="resources/subframe-observing-longtask.html"></iframe>
<script>
/* Create an iframe that generates a long task. */
const iframe = document.createElement('iframe');
iframe.id = 'child-iframe-id';
iframe.name = 'child-iframe-name';
document.body.appendChild(iframe);
iframe.src = 'resources/subframe-with-longtask.html'
</script>
</body>