File: spurious-frame-callbacks-optimization.html

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<!DOCTYPE html>
<head>
  <title>Optimization of requestAnimationFrame callbacks that don't modify the DOM shouldn't break animations</title>
  <link rel="author" title="Mukilan Thiyagarajan" href="mailto:mukilan@igalia.com">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
</head>
<body>
    <div id="target">0</div>
</body>
<script>
"use strict";
async_test(function(test) {
  let frame = 0;
  const draw = (t) => {
    frame += 1;
    if (frame < 11) {
      // Don't mutate the DOM for 10 frames to meet the threshold for Servo's
      // spurious frame optimization to kick in.
      requestAnimationFrame(draw);
    } else if (frame == 11) {
      // Don't schedule next rAF so the compositor's tick is disabled.
      // This is specific to Servo as the spurious frame detection at the
      // time of this test was broken.
      test.step_timeout(() => {
        requestAnimationFrame(draw);
      }, 0);
    } else {
      // Normal frames.
      document.getElementById('target').innerText = t;
      requestAnimationFrame(draw);
    }
  };

  let target = document.getElementById('target');
  test.step_timeout(test.step_func_done(() => {
    assert_greater_than(parseInt(target.innerText), 500);
  }), 550);
  requestAnimationFrame(draw);
});
</script>