title: Label doesn't work
body: <p>I have this code:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.hidden_element {
    height: 1px;
    width: 1px;
    overflow: hidden;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;form action=""&gt;
    &lt;label for="file"&gt;
      &lt;button type="button" class="button red"&gt;Choose File&lt;/button&gt;
    &lt;/label&gt;
    &lt;div class="hidden_element"&gt;
      &lt;input type="file" name="video" id="file" /&gt;
    &lt;/div&gt;
  &lt;/form&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>The problem is when I click choose file nothing happens.</p>