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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prerender/remove-script-element.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/utils.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.js"></script>

<body>
<iframe id="iframe"></iframe>
<script>
setup(() => assertSpeculationRulesIsSupported());

async_test(t => {
  const doc = iframe.contentDocument;
  const script = doc.createElement('script');
  script.type = 'speculationrules';
  script.text = `{"prerender": [{"source": "list", "urls": [] }] }`;
  doc.head.appendChild(script);
  iframe.remove();
  t.step_timeout(() => {
    document.head.appendChild(script);
    t.done();
  }, 0);
}, 'Removing speculationrules script from detached document should not crash');
</script>