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The declaration unicode-bidi: bidi-override causes an error message when CSS Level 3 is selected: Value Error : unicode-bidi bidi-override is not a unicode-bidi value : bidi-override Other values of the property as per CSS 2.1 are accepted. And bidi-override is accepted when other CSS levels are used. It is still a correct value as per CSS Writing Modes Module Level 3: http://www.w3.org/TR/css3-writing-modes/#unicode-bidi (The new values defined there aren’t accepted by the validator either, but that’s understandable since the document is just a WD.)
Fixed and updated to the latest spec (and there was indeed a strange error with bidi-override) Thanks,