W3C specifications
demo (if online)
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Cascading Style Sheets
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1996: level 1
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1998: CSS level 2
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improved printing
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aural renderings
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downloadable fonts
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positioned elements
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tables
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CSS+XML
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1998: XSL Working Draft
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transformations
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formatting objects
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1999: CSS3 Working Draft
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columns
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transparencies
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vertical text