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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/dynamic-markup-insertion/document-write/001.html 

<!doctype html>
<title>document.write</title>
<script src="/resources/testharness.js"></script><script src="/resources/testharnessreport.js"></script>
<script>
test(
function() {
  document.write("PASS");
  assert_equals(document.body.textContent, "PASS");
}
);
</script>
<div id="log"></div>