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chromium/third_party/blink/web_tests/external/wpt/web-locks/crashtests/settle-after-steal.https.html 

<!DOCTYPE html>
<meta charset="utf-8">
<html class="test-wait">
<script>
  navigator.locks.request("foo", async () => {
    await new Promise(queueMicrotask);
    document.documentElement.classList.remove("test-wait");
  });
  navigator.locks.request("foo", { steal: true }, () => {});
</script>