Validating HTML5 Documents

The HTML5 validator is no longer concerned with code style. You can use uppercase or lowercase, omit quotes from attributes, exclude optional closing tags, and be as inconsistent as you like, and your page will still be valid.

So, you ask, what doescount as an error for the HTML5 validator? It will alert you to the incorrect use of elements, elements included where they shouldn’t be, missing required attributes, incorrect attribute values, and the like. In short, the validator will let you know if your markup conflicts with the specification, so it’s still a valuable tool when developing your pages.

To give you a good idea of how HTML5 differs from the overly strict XHTML, let’s go through some specifics. This way, you can understand what is considered valid in HTML5:

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by Louis Lazaris via SitePoint