I know about html, CSS validation and some rules in css performance pages. Is there everything in one verification tool? Maybe he can check out some recommendations for html markup.
For HTML, consider using HTML Tidy
Use this Html Validator 0.8.5.8 with firefox.
https://addons.mozilla.org/en-US/firefox/addon/249
He will show a mistake and give the best offer.
And this CodeBurner for Firefox 1.0 https://addons.mozilla.org/en-US/firefox/addon/13048
And if you need software, use this http://www.freehtmlvalidator.com/
And if you need an online tool, go for it http://www.onlinewebcheck.com/
Consider the YSlow Firefox extension from yahoo.
Check out The W3C QA Toolbox (for markup, links, CSS checking) and the popular YSlow Firefox Extension, PageSpeed ββ( another extension for Firefox) and SpeedTracer (sort of like YSlow !, but for Google Chrome), which are more performance oriented.
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