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<!DOCTYPE html>
<script src="util.js"></script>
<script>
window.onload = function() {
let s = "";
for (let i = 0; i < 50; i++) {
s += ".x";
for (let j = 0; j < 100; j++) {
s += "[y~=v" + j + "]";
}
s += " { background-color: yellow; }";
}
var style = document.createElement("style");
style.textContent = s;
document.head.appendChild(style);
let els = [];
for (let i = 0; i < 1000; i++) {
var el = document.createElement("e" + i);
el.className = "x";
let val = "";
for (let j = 0; j < 100; j++) {
val += "v" + j + " ";
}
el.setAttribute("y", val);
document.body.appendChild(el);
els.push(el);
}
flush_style(els[0]);
perf_start();
for (let el of els) {
el.className = "";
}
flush_style(els[0]);
perf_finish();
};
</script>
<body></body>