<bindings xmlns="http://www.mozilla.org/xbl"> <binding id="test"> <content> <html:div xmlns:html="http://www.w3.org/1999/xhtml" style="color: red; -moz-binding: url(403962-1xbl.xml#test-base)"> <children/> </html:div> </content> </binding> <binding id="test-base"> <content> <html:div xmlns:html="http://www.w3.org/1999/xhtml" style="color: green"> <children includes="span"/> </html:div> <html:div xmlns:html="http://www.w3.org/1999/xhtml" style="color: red"> <children/> </html:div> </content> </binding> </bindings>