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chromium/third_party/blink/web_tests/fast/parser/external-entities.xml 

<?xml version="1.0" ?>
<!DOCTYPE html SYSTEM "resources/external-entities.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<script type="text/javascript">
if (window.testRunner)
    testRunner.dumpAsText();
</script>
<p>&message;</p>
<p class="test"><font color="red"> This should be the only line on this page.  You should see a parse error above.</font></p>
</body>
</html>