blog/_layouts/xslt_container.html

{% if page.layout == "xslt" %}<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xml" href="/feed.xslt.xml"?>
<?xml-stylesheet type="text/css" href="/assets/css/xslt.css"?>
<xsl:stylesheet
    version="3.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:sm="http://www.sitemaps.org/schemas/sitemap/0.9">
  <xsl:output method="html" version="4.0" encoding="UTF-8" indent="yes" doctype-system="about:legacy-compat" />
  <xsl:template match="/">
    {{ content }}
  </xsl:template>
</xsl:stylesheet>
{% else %}<!DOCTYPE html>
{{ content }}
{% endif %}