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<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<box id="box" style="background-color: red;">Hello</box>
</window>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<box id="box" style="background-color: red;">Hello</box>
</window>