title: Does HTML5 change the standard for HTML commenting?
body: <p>Recently I found that there is, possibly, a new way of commenting in HTML5.</p>
  <p>Instead of the typical <code>&lt;!-- --&gt;</code> multi-line commenting I've read about,  I <em>thought</em> I noticed that my IDE made a regular <code>&lt;!div &gt;</code> commented out. So I tested it out, and to my surprise Chrome had commented out that tag. It <em>only</em> commented out the tag and not the contents of the div, so I had to comment out the closer <code>&lt;!/div&gt;</code> to avoid closing other divs.</p>
  <p>I tested another and it appears that generally putting an exclamation marker in front of the opening of any tag, this symbol <code>&lt;</code>, makes that tag commented out.</p>
  <p>Is this actually new? Is it bad practice? It is actually very convenient, but is it practical yet (if not new)?</p>
  <p><strong>Extra details:</strong></p>
  <p>Although a syntax error or misinterpretations of this particular syntax is a good reason, how come Chrome <em>actually</em> renders them as full comments?</p>
  <p><strong>The code is written as</strong>:</p>
  <pre class="lang-none prettyprint-override"><code>&lt;!div displayed&gt; some text here that is still displayed &lt;!/div&gt;
  </code></pre>
  <p><strong>And then it is rendered as</strong>:</p>
  <pre class="lang-none prettyprint-override"><code>&lt;!--div displayed--&gt; some text here that is still displayed &lt;!--/div--&gt;
  </code></pre>