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Test Info:
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<tbody contenteditable="true"/>
<frameset/>
<xul:box onbeforecopy="event.explicitOriginalTarget.parentNode.parentNode.removeChild(event.explicitOriginalTarget.parentNode)">
<xul:box/>
</xul:box>
</html>