Due to the low level of support for HTML5 in older browsers, should (or can) use any part of HTML5 at the moment for a new website in which there will be different users with a full range of browsers (and versions) to access the site?
EDIT: To fill out additional information here. This website, for simplified comparison, will resemble fb. I'm not talking about a social website that will be accessible to this type of large audience (anyone can join), and will be an interactive portal (and not just the full static content of the site displayed).
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!:)
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Currently, mobile phones now seem to be benefiting from HTML 5 forms because they recognize the type of input, say “email,” and then provide the user with a specific keyboard layout.
Its also easy to provide JavaScript to support some html 5 elements http://www.modernizr.com/