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Data types are specified in "The Transformation Functions" with a link to CSS3 Values and Units (WD) and "Transform Values and Lists" with a link to http://www.w3.org/TR/REC-CSS2/syndata.html#values (which doesn't handle <angle>). Maybe we can merge the later section into the first one and use the link to the WD? Can we remove the section "CSS Values" completely?