<!DOCTYPE html>
<title>window.requestIdleCallback max idle period deadline (dynamic timoeout).</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) {
    for (const timeout of [10, 20, 30]) {
      const {before, after} = await new Promise(resolve => requestIdleCallback(async deadline => {
        const before = deadline.timeRemaining();
        const timerPromise = new Promise(resolve => step_timeout(resolve, timeout));
        const after = deadline.timeRemaining();
        await timerPromise;
        resolve({before, after})
      }))

      assert_less_than_equal(after, before)
      assert_less_than_equal(after, timeout)
    }
  }

}, 'Check that the deadline is changed if there is a new timeout 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>