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chromium/third_party/blink/web_tests/dom/document_type/remove.html 

<!DOCTYPE html>
<title>This tests the DOM 4 remove method on a DocumentType node</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
setup({single_test: true});
var doctype = document.doctype;
assert_equals(document.childNodes.length, 2);
doctype.remove();
assert_equals(document.childNodes.length, 1);
doctype.remove();
assert_equals(document.childNodes.length, 1);
done();
</script>