title: How can I briefly flash a rectangle around a form?
body: <p>What I want to do is when a user clicks something:</p>
  
  <pre><code>&lt;div id="FormContainer"&gt;
      &lt;form&gt;
       ...
      &lt;/form&gt;
  &lt;/div&gt;
  
  &lt;a href="#" onClick="FlashElement()"&gt;Make it flash&lt;/a&gt;
  </code></pre>
  
  <p>It briefly flashes a rectangle around the form within the <code>FormContainer</code>. Is there any way I can achieve this?</p>