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Example: 4 div#monolith 50% is not a border-top-left-radius value : 50% 100% 7 div#monolith 50% is not a border-top-right-radius value : 50% 100% Where it shows percentage is allowed in specification: http://www.w3.org/TR/css3-background/#the-border-radius
Should work now, as css3-border were re-implemented recently according to the latest Css3 draft.