for ie8 etc read this: http://html5doctor.com/how-to-get-html5-working-in-ie-and-firefox-2/
And finally HTML 5 is still a pipe dream in some circles, you find a cool new preview ship it to your boss and he says, it doesn’t work in IE8, well shit, nevermind then, it must not of been that cool, burned again,lol.
for ie8 etc read this: http://html5doctor.com/how-to-get-html5-working-in-ie-and-firefox-2/