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Scaling of text items works very well. Check it by resizing your window.
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The text size and position is being determined dynamically according to the available space.
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Unfortunately scaling the text for each slide can result in different text sizes on each slide. (I set a maximum size, but still)
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Cross Browser right now means Gecko and IE. That is not due to X libraries, but my lack of time spent with other engines (opera and konqueror).