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copied!<p><strong>TL;DR</strong></p> <ul> <li>Custom tags are invalid in HTML. This may lead to rendering issues.</li> <li>Makes future development more difficult since code is not portable.</li> <li>Valid HTML offers a lot of benefits such as SEO, speed, and professionalism.</li> </ul> <p><strong>Long Answer</strong></p> <p>There are <a href="http://www.html5rocks.com/en/tutorials/webcomponents/customelements/" rel="nofollow noreferrer">some arguments</a> that code with custom tags is more usable.</p> <p>However, it leads to invalid HTML. Which is not good for your site.</p> <p><a href="https://stackoverflow.com/questions/1337928/whats-the-point-of-valid-css-html"><strong>The Point of Valid CSS/HTML | StackOverflow</strong></a></p> <blockquote> <ul> <li><a href="http://www.hobo-web.co.uk/seo-blog/index.php/official-google-prefers-valid-html-css/" rel="nofollow noreferrer">Google prefers it so it is good for SEO.</a></li> <li>It makes your web page more likely to work in browsers you haven't tested.</li> <li>It makes you look more professional (to some developers at least)</li> <li>Compliant browsers can render [valid HTML faster]</li> <li>It points out a bunch of obscure bugs you've probably missed that affect things you probably haven't tested e.g. the codepage or language set of the page.</li> </ul> </blockquote> <p><a href="http://validator.w3.org/docs/why.html#why_pros" rel="nofollow noreferrer"><strong>Why Validate | W3C</strong></a></p> <blockquote> <ul> <li>Validation as a debugging tool</li> <li>Validation as a future-proof quality check</li> <li>Validation eases maintenance</li> <li>Validation helps teach good practices</li> <li>Validation is a sign of professionalism</li> </ul> </blockquote>

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