HTML5 wrapper for old browsers, Modernizr

I'm new to HTML5. It appears that Modernizr and a massive array of "HTML5 shims" provide bits of HTML5 support for older browsers.

But what if I'm lazy and I don't want to even think about older browsers? Which HTML5 featu开发者_如何转开发res can be perfectly emulated and which cannot?

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If you're new to HTML5, you should read everything on DiveIntoHTML5.ep.io.