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+++ b/testing/web-platform/tests/requestidlecallback/deadline-max-rAF-dynamic.html
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+<!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>