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<!doctype html>
<style>
div { padding: 1px; }
.test div { padding: 2px; }
.test div div { padding: 3px; }
.test div div div { background: orange; }
.test div div div div { background: white; }
.test div div div div div { background: red; }
</style>
<body>
<script>
let root = document.createElement('div');
let p = root;
for (let i = 0; i < 1000; ++i) {
p = p.appendChild(document.createElement('div'));
p.appendChild(document.createTextNode(i));
}
document.body.appendChild(root);
document.body.offsetTop;
root.className = 'test';
</script>
</body>
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