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Actually, now that I think some more about it, how will knowing the parent tree be enough to support absolute positioning. For example suppose that you use absolute positioning to position a semitransparent box in the upper left corner of the document as a sort of overlay. Also suppose that the <div> representing this box i sthe last element in the document tree. Now when you are rendering the first page, how will you know that the upper left corner needs a box overlay unless you've parsed the rest of the tree?
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