<?xml version="1.0"?> <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" width="400" height="600"> <vbox> <hbox style="height: 20px;"> <spacer style="width: 100px; background: yellow;"/> <spacer style="width: 100px; background: blue;"/> <spacer style="width: 50px; background: yellow;"/> <spacer style="width: 150px; background: green;"/> </hbox> <hbox style="height: 20px;"> <spacer style="width: 100px; background: yellow;"/> <spacer style="width: 100px; background: blue;"/> <spacer style="width: 50px; background: yellow;"/> <spacer style="width: 150px; background: green;"/> </hbox> <hbox style="height: 20px;"> <spacer style="width: 100px; background: yellow;"/> <spacer style="width: 100px; background: blue;"/> <spacer style="width: 50px; background: yellow;"/> <spacer style="width: 150px; background: green;"/> </hbox> <hbox style="height: 20px;"> <spacer style="width: 100px; background: yellow;"/> <spacer style="width: 100px; background: blue;"/> <spacer style="width: 200px; background: green;"/> </hbox> <hbox style="height: 20px;"> <spacer style="width: 100px; background: yellow;"/> <spacer style="width: 300px; background: green;"/> </hbox> <hbox style="height: 20px;"> <spacer style="width: 200px; background: yellow;"/> <spacer style="width: 200px; background: green;"/> </hbox> <hbox style="height: 20px;"> <spacer style="width: 100px; background: yellow;"/> <spacer style="width: 300px; background: green;"/> </hbox> </vbox> </window>