Because the namespace is not correct
<xsl:stylesheet version="1.0" xmlns:xsl="
http://www.w3.org/1999/XSL Transform">
should be
<xsl:stylesheet version="1.0" xmlns:xsl="
http://www.w3.org/1999/XSL/Transform">
But you will "get" everything, but not "see" everything
W3schools shows the result in a browser, it only shows the html working
I recommend that you download an IDE for learning and testing,
that way you see exactly what you get
here is a good one
www.oxygenxml.com