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the best offline validator ever :D Rated 5 out of 5 stars
as a junior web-developer i'm using this tool(along with the http://validator.w3.org/ online validator) to validate my pages. it works great.
still i'd like to suggest some improvements though, because my page validates at http://validator.w3.org/, but this validator gives a warning:
anyway, great tool and i advice any web developer to use it!