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chromium/third_party/blink/web_tests/external/wpt/dom/nodes/DocumentType-remove.html 

<!DOCTYPE html>
<meta charset=utf-8>
<title>DocumentType.remove</title>
<link rel=help href="https://dom.spec.whatwg.org/#dom-childnode-remove">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="ChildNode-remove.js"></script>
<div id=log></div>
<script>
var node, parentNode;
setup(function() {
  node = document.implementation.createDocumentType("html", "", "");
  parentNode = document.implementation.createDocument(null, "", null);
});
testRemove(node, parentNode, "doctype");
</script>