document-user-activation-iframe-delegation.html

<!DOCTYPE html>
<title>Test user gesture is delegated to iframes after navigation.</title>
<script>
  if (window.testRunner) {
    testRunner.waitUntilDone();
    testRunner.dumpAsText();
  }

  chrome.gpuBenchmarking.pointerActionSequence([
      {"source": "mouse",
       "actions": [
       { "name": "pointerDown", "x": 0, "y": 0 },
       { "name": "pointerUp" } ]}], () => {
         document.location.href = 'resources/test-autoplay-post-navigation.html';
       });
</script>

chromium/third_party/blink/web_tests/http/tests/media/autoplay/document-user-activation-iframe-delegation.html