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chromium/third_party/blink/web_tests/fast/xsl/resources/subframe.xsl 

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" doctype-system="about:legacy-compat"/>
<xsl:template match="/">
<html>
<body>Hello</body>
</html>
</xsl:template>
</xsl:stylesheet>