requestidlecallback/deadline-max-rAF-dynamic.html

<!DOCTYPE html>
<title>window.requestIdleCallback max idle period deadline (requestAnimationFrame).</title>
<meta name="timeout" content="long">
<link rel="author" title="Noam Rosenthal" href="mailto:noam@webkit.org" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/ric-utils.js"></script>
<script>

promise_test(async () => {
  for (let i = 0; i < getRICRetryCount(); ++i) {
    const {before, after} = await new Promise(resolve => requestIdleCallback(async deadline => {
      const before = deadline.timeRemaining();
      const animationFramePromise = new Promise(requestAnimationFrame);
      const after = deadline.timeRemaining();

      // Waiting till rAF is handled before the next iteration, to avoid residual callacks between iterations.
      await animationFramePromise;
      resolve({before, after})
    }))

    assert_less_than_equal(after, before)
    assert_less_than_equal(after, getPendingRenderDeadlineCap())
  }

}, 'Check that the deadline is changed if there is a new requestAnimationFrame from within requestIdleCallback.');
</script>
<h1>Test of requestIdleCallback deadline behavior</h1>
<p>The test can pass accidentally as idle deadlines have a maximum but they can always be shorter.
It runs multiple times to expose potential failures.</p>
<div id="log"></div>