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<?xml version='1.0'?>
<?xml-stylesheet href="chrome://global/skin/global.css"?>
<?xml-stylesheet href="chrome://devtools/skin/tooltips.css"?>
title="Tooltip test">
<vbox flex="1">
<hbox id="box1" style="height: 50px">test1</hbox>
<hbox id="box2" style="height: 50px">test2</hbox>
<hbox id="box3" style="height: 50px">test3</hbox>
<hbox id="box4" style="height: 50px">test4</hbox>
</vbox>
</window>