cpu-profiling.html | Explore in Territory

<!doctype html>
<html>
  <head>
    <script type="module">
      moduleCallback();
    </script>
    <script>
      let asyncScriptCallback;
      let blockingHandlerCallback;
      let moduleCallback;
      window.__modulePromise = new Promise(res => moduleCallback = res);
      window.__asyncScriptPromise = new Promise(res => asyncScriptCallback = res);
      window.__blockingHandlerPromise = new Promise(res => blockingHandlerCallback = res);

      function somethingElse() {
        const startTime = performance.now();
        while (performance.now() - startTime < 200);
        blockingHandlerCallback()
      }
      function executeSomething() {
        something();
        somethingElse();
      }
      function something() {
      }
    </script>
    <script src="coop.php" async onload="asyncScriptCallback()">
    </script>
  </head>
  <body onload="executeSomething()">
    <p>
        CPU Profiling
    </p>
  </body>
</html>

chromium/third_party/blink/web_tests/http/tests/inspector-protocol/resources/cpu-profiling.html