ModifySelectorText.html | Explore in Territory

<!DOCTYPE html>
<html>
<head>
<script src="../resources/runner.js"></script>
<style id="sheet">
</style>
</head>
<body>
<script>
let style_text = '';
for (let i = 0; i < 10000; ++i) {
  style_text += '.class' + i + ' { color: red; }';
}
sheet.innerHTML = style_text;

var runFunction = function()
{
  document.styleSheets[0].cssRules[9999].selectorText = '#random' + Math.floor(Math.random() * 10000000);
}

PerfTestRunner.measureRunsPerSecond({
  description: "Measures performance of modifying selectorText on a rule late in the stylesheet",
  run: runFunction
});

</script>
</body>
</html>

chromium/third_party/blink/perf_tests/css/ModifySelectorText.html