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Theoretically, could you detect if a browser supports HTML5 and prompt the visitor to upgrade to IE9/Firefox/Chrome/Safari/Opera if it doesn’t support some features like CSS3 or audio/video tags?
I’m developing a hobby music site in a mostly walled-garden and would like to prevent people with anitquated browsers from accessing/logging into the site.
Mass appeal is not a requirement as the site is for a niche and maximizes JavaScript and HTML5 use.
I’d suggest using the modernizr javascript api to detect the HTML5 features you desire.
http://www.modernizr.com/