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    copied!<p><strong>TL;DR</strong> Most of the non standard meta tags are not yet available for HTML5 validators. Until then you should include a small tag if you <em>must</em> have valid code.</p> <hr> <p>Ok, I did a little bit more research into the subject. The issue is that the metatags on the WHATWG wiki are supposed to be used by validators, but in many cases because the tags update so frequently most validators ignore them until they become official parts of the spec.</p> <p>So the only standard metatags right now are:</p> <ul> <li>application-name</li> <li>author</li> <li>description</li> <li>generator</li> <li>keywords</li> </ul> <p>Eventually once the spec gets updated again the <code>rights-standard</code> metatag will validate as well, but until then we need a workaround ... which is ...</p> <p>....<em>drumroll</em>....</p> <p>The <code>&lt;small&gt;</code> tag!</p> <blockquote> <p>The small element represents side comments such as small print.</p> <p>Small print typically features disclaimers, caveats, legal restrictions, or copyrights. Small print is also sometimes used for attribution, or for satisfying licensing requirements.</p> </blockquote> <p><strong>Source:</strong> <a href="http://dev.w3.org/html5/spec/text-level-semantics.html#the-small-element">http://dev.w3.org/html5/spec/text-level-semantics.html#the-small-element</a></p> <hr> <p>Also, just a side note. Just because your code doesn't validate doesn't mean it isn't valid. The spec is constantly evolving, so you just need to bear with it until things become more concrete.</p>
 

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