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Hixie's Work (Score:1)
Ian Hixie, of Opera (and Mozilla) has done lots of work with testing CSS — mainly from the point of view of determining how well browsers support CSS, but it might be possible to use something similar for verifying that you haven't broken your style-sheets.
I believe the general idea for regression testing is to make a browser render a page, wait 10 seconds, take a screenshot, and then check it is identical to one you prepared earlier.
I've only read about this, I haven't tried doing it, so I can't offer any more help, but this log entry may be a start.
Smyers
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