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copied!<p>There are several things to consider:</p> <ol> <li>First, validation doesn't mean that much, because an HTML page can very well be valid but badly authored, inaccessible, etc. See <a href="http://www.cs.tut.fi/~jkorpela/html/validation.html#icon" rel="nofollow noreferrer">Say <em>no</em> to "Valid HTML" icons</a> and <a href="http://hixie.ch/advocacy/xhtml" rel="nofollow noreferrer">Sending XHTML as text/html Considered Harmful</a> (in reference to the hobo-web tests mentioned in another response)</li> <li>Given this, I'd highly recommend using the new DOCTYPE: the only reason for having it in HTML5 is that it's the smallest thing that triggers standards mode in browsers, so if you want standards mode, go with it; you have little to no reason to use another, verbose, error-prone DOCTYPE</li> <li>As for the forms enhancements, you can use Weston Ruter's <a href="http://code.google.com/p/webforms2/" rel="nofollow noreferrer">webforms2</a> JS library to bring it to non-aware browsers</li> <li>and finally, about the <code>data-*</code> attributes, it a) works in all browsers (as long as you use <code>getAttribute()</code>), b) is still better than abusing the <code>title</code> or <code>class</code> attributes and c) won't bother you with validation as we said earlier that validation isn't <em>that</em> important (of course it is, but it doesn't matter that your page is invalid if the validity errors are willful; and you can already use HTML5 validation in the W3C validator, so...); so there's no real reason not to use them either.</li> </ol>

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