<?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin" type="text/css"?> <window title="XUL Layout" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" xmlns:html="http://www.w3.org/1999/xhtml"> <vbox style="overflow:auto; height:200px"> <html:span style="color:blue;">Hello Kitty</html:span> </vbox> </window>