File: do_work_500ms.html

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Do some work for 500ms</title>
  <script>
    const milliseconds = 500;
    const millisecondsPerBatch = 10;
    const end = Date.now() + milliseconds;
    window.total = 0;
    let i = 0;

    /**
     * Do work for a set number of milliseconds, but only do the work in batches
     * so the browser does not get unresponsive.
     */
    function doWork() {
      const batchEnd = Date.now() + millisecondsPerBatch;
      // Do some work for a set amount of time.
      while (Date.now() < end) {
        // Do some kind of work that is non-deterministic to guard against optimizations.
        window.total += Math.random();
        i++;

        // Check if a batch is done yet.
        if (Date.now() > batchEnd) {
          // Defer the rest of the work into a micro task. Keep on doing this until
          // the total milliseconds have elapsed.
          setTimeout(doWork, 0);
          return;
        }
      }
    }

    doWork();
  </script>
</head>
<body>
  Do some work for 500ms.
</body>
</html>