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<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(async () => {
await new Promise(resolve => document.addEventListener('DOMContentLoaded', resolve, {once:true}));
await new Promise(resolve => requestAnimationFrame(resolve));
await new Promise(resolve => requestAnimationFrame(resolve));
// #fs1, #container, and #child were laid out.
// Move #child.
// It makes #container dirty, and it exceeds from #fs1's 1x1 grid.
document.querySelector('#fs1').insertBefore(
document.querySelector('#child'), document.querySelector('#container'));
await new Promise(resolve => requestAnimationFrame(resolve));
await new Promise(resolve => requestAnimationFrame(resolve));
// Removing #child makes #container visible again.
document.querySelector('#child').remove();
await new Promise(resolve => requestAnimationFrame(resolve));
await new Promise(resolve => requestAnimationFrame(resolve));
}, 'No crash when a dirty FRAMESET exceeds from the grid then fits in it again');
</script>
</head>
<frameset id="fs1">
<frameset id="container">
<frameset id="child"></frameset>
</frameset>
</frameset>
</html>
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