title: get iframe inside div with javascript
body: <p>Is there a way to do the following in JavaScript?</p>
  
  <ol>
  <li>get a div by a class name,</li>
  <li>get the iframe inside the div</li>
  <li>and add an attribute (frameborder = 0) </li>
  </ol>
  
  <hr>
  
  <pre><code>&lt;html&gt;
      &lt;body&gt;
          &lt;div class="calendar"&gt;
              &lt;iframe&gt;&lt;/iframe&gt;
          &lt;/div&gt;
      &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>