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

<!doctype html>
<script type=module>
document.write("document.write body contents\n");
document.close();
window.parent.document.dispatchEvent(new CustomEvent("documentWriteDone"));
</script>
Initial body contents