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<!DOCTYPE html>
<script src="util.js"></script>
<script>
window.onload = function() {
document.head.appendChild(build_rule(".x[y~='e500']", 100000, "{ color: blue; }"));
var div = document.createElement("div");
div.className = "x";
let val = "";
for (let i = 0; i < 1000; i++) {
val += "e" + i + " ";
}
div.setAttribute("y", val);
document.body.appendChild(div);
flush_style(div);
perf_start();
div.style.color = "green";
flush_style(div);
perf_finish();
};
</script>
<body></body>