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chromium/third_party/blink/web_tests/external/wpt/fetch/api/crashtests/request.html 

<!DOCTYPE html>
<meta charset="utf-8">
<script src="/common/utils.js"></script>
<script>
  // Cycle collection test for a case where the Request object is alive and accessible globally.
  var req = new Request(`/`);
  fetch(req)
</script>