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I've been reading about HTML5 and would like to start using some of it, particularly datasets as I've found an interesting looking jQuery plugin that I can start using...
http://www.barklund.org/blog/2009/08/28/html-5-datasets/
Now, I understand that older browsers like IE6 may not like having extra attributes in there and may not know what to do with them but if they ignore them and the site still validates using an HTML5 validator then that should be OK, no?
I especially want to make sure I'm not going to get penalised by Google etc. for not having valid markup and that I'm not going to get complaints from clients that their site is "not valid" when they check it using a bog standard W3C validator.
What are people's thoughts on this?
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HTML5 is several years old now, and as the living standard of the language as a whole, it will only continue to get updated to work with the modern web.
HTML 5 has become a standard language of the internet and is the most widely accepted by modern browsers. You should only be using older versions of HTML (e.g., 4.0, 3.2, etc.) if you have a specialized reason to do so. If you don't have a specific situation that calls for something else, then you should use HTML 5.
W3C endorses the Web development specification as an official standard. At long last, HTML5 today reached the official Recommendation stage, meaning the World Wide Web Consortium finally endorsed it as an official standard, even as the technology already is in use in browsers.
I'd recommend checking out Dive Into HTML 5 and deciding for yourself if you think the tradeoffs are acceptable. So far as I've heard, there are no negative SEO implications for using HTML 5. I just ran the w3c validator on Dive Into HTML 5 and it automatically detected that it was HTML 5 and validated it, so I don't think that will be a concern, either.
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The answer is simple:
Not Yet! But soon.
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