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<!DOCTYPE html>
<style>
.x { color: yellow; }
</style>
<script src="util.js"></script>
<script>
function set_class(n) {
n.className = "x";
n = n.firstChild;
while (n) {
set_class(n);
n = n.nextSibling;
}
}
window.onload = function() {
let root = build_dom(50000, "div");
document.body.appendChild(root);
flush_layout(root);
perf_start();
set_class(root);
flush_style(root);
perf_finish();
};
</script>
<body></body>