<html xmlns="http://www.w3.org/1999/xhtml"> <head> <bindings xmlns="http://www.mozilla.org/xbl"> <binding id="foo"> <content> <iframe xmlns="http://www.w3.org/1999/xhtml" src="javascript:void 0"><children xmlns="http://www.mozilla.org/xbl"/></iframe> </content> </binding> </bindings> </head> <body> <span style="-moz-binding: url(#foo)"></span> </body> </html>