File: web-animations-no-infinite-refresh.html

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<!doctype html>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<title>Test that a pending animation doesn't keep vsync running forever</title>
<body>
<script>
function ensureVsyncDisabled() {
  let wu = SpecialPowers.wrap(window).windowUtils;
  return new Promise(resolve => {
    function check() {
      if (wu.refreshDriverHasPendingTick) {
        requestIdleCallback(check, {timeout:300});
      } else {
        resolve();
      }
    }
    check();
  })
}

promise_test(async function() {
  await ensureVsyncDisabled();
  let doc = new DOMParser().parseFromString("<div>", "text/html");
  let anim = doc.querySelector("div").animate(null);
  assert_true(anim.pending, "Animation should be pending");
  anim.timeline = document.timeline;

  await ensureVsyncDisabled();
  assert_true(true, "Vsync should be disabled");
});
</script>