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chromium/third_party/blink/web_tests/external/wpt/editing/other/non-html-document.html 

<!doctype html>
<meta charset=utf-8>
<title>Non-HTML document tests</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>

test(function() {
  let xmldoc =
    document.implementation.createDocument("http://www.w3.org/1999/xlink",
                                           "html", null);
  for (let f of [
         () => xmldoc.execCommand("bold"),
         () => xmldoc.queryCommandEnabled("bold"),
         () => xmldoc.queryCommandIndeterm("bold"),
         () => xmldoc.queryCommandState("bold"),
         () => xmldoc.queryCommandSupported("bold"),
         () => xmldoc.queryCommandValue("bold"),
       ]) {
    assert_throws_dom("InvalidStateError", f);
  }
}, "editing APIs on an XML document should be disabled");

</script>