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http://dvcs.w3.org/hg/quirks-mode/raw-file/tip/Overview.html#the-percentage-height-calculation-quirk [[ and that is an html element and is a block container box ]] The root element is (I think) always a block container box, so that can be removed. Also fix tests.
http://dvcs.w3.org/hg/quirks-mode/rev/196251e36599