Get up to speed with the new options available to you, but don't forget back-end validation too. The focus is Firefox 4, but it's universally-applicable.
Aaron Gustafson is the Founder and Principal Consultant of Easy! Designs, a web development consultancy. He is also Group Manager of the Web Standards Project (WaSP) where he has spearheaded both Web Standards Sherpa and a small business outreach effort. He is also a speaker, and an author.
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Client-side forms validation with HTML5
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HTML Lint
A parser to ensures best practices.
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Crafting Rich Experiences with Progressive Enhancement