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chromium/third_party/blink/web_tests/fast/xsl/resources/xslt-mismatched-tags-in-xslt.xsl 

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <xsl:output method="html" encoding="UTF-8"/>
    <xsl:template match="TEST">
        <html xmlns="http://www.w3.org/1999/xhtml">
            <body>
          		<p>You should see error text above this</p>
          		<p>
            </body>
        </html>
  </xsl:template>
</xsl:stylesheet>