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<!DOCTYPE html>
<style>
.x { background-color: yellow; }
</style>
<script src="util.js"></script>
<script>
window.onload = function() {
let roots = [];
for (let i = 0; i < 200; i++) {
let root = document.createElement("div");
roots.push(root);
document.body.appendChild(root);
}
flush_style(roots[0]);
perf_start();
for (x in ["x", "", "x"]) {
for (let root of roots) {
root.className = x;
}
}
flush_style(roots[0]);
perf_finish();
};
</script>
<body></body>