title: What does these tags mean [if IE 8]?
body: <p>I bought a template. There are some tags, which I don't understand:</p>
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;!--[if IE 8]&gt; &lt;html lang=&quot;en&quot; class=&quot;ie8 no-js&quot;&gt; &lt;![endif]--&gt;
  &lt;!--[if IE 9]&gt; &lt;html lang=&quot;en&quot; class=&quot;ie9 no-js&quot;&gt; &lt;![endif]--&gt;
  &lt;!--[if !IE]&gt;&lt;!--&gt;
  &lt;html lang=&quot;en&quot; class=&quot;no-js&quot;&gt;
  &lt;!--&lt;![endif]--&gt;
  </code></pre>
  <p>What are these if-clause and what I have to do with them?
  Are they for the browser, and I don't have to do nothing with them, or I have to render them with PHP in someway?</p>