I always try to pay attention to XHTML validation, and the vast majority of minor modifications I end up creating are XHTML 1.0 Transitional valid (except the old AOL video one). I also end up having to fix a ton of modifications installed which seem like the authors don't care less about validation, and their updates often say to revert templates when the only difference is my last edited version is valid and their most modern version isn't...
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