Coincidentally spotted this source code in some Microsoft Windows Server® 2022 Remote Desktop Web Access thingy yesterday:

    <?xml version="1.0" encoding="UTF-8"?>
    <?xml-stylesheet type="text/xsl" href="../Site.xsl"?>
    <?xml-stylesheet type="text/css" href="../RenderFail.css"?>

    <RDWAPage 
        helpurl="http://go.microsoft.com/fwlink/?LinkId=141038" 
        (…)