title: Image tag from google chart not displayed
body: <p>I have the following image tag, which isn't being displayed:</p>
  
  <pre><code>&lt;img src="https://www.google.com/chart?cht=tx&amp;amp;chf=bg,s,FFFFFF00&amp;amp;chco=000000&amp;amp;chl=test3"&gt;
  </code></pre>
  
  <p>JSFiddle: <a href="http://jsfiddle.net/evs7gsk3/8/" rel="nofollow">http://jsfiddle.net/evs7gsk3/8/</a></p>
  
  <p>There is an associated console error: <code>GET https://www.google.com/chart?cht=tx&amp;chf=bg,s,FFFFFF00&amp;chco=000000&amp;chl=test3 400 (OK)</code></p>
  
  <p>The image can be viewed by pasting the url into the browser and replacing all occurences of <code>&amp;amp;</code> by <code>&amp;</code>. Beware though, when you do so, you'll have the image in your cache and will not be able to reproduce the error unless you clear/deactivate your cache.</p>
  
  <p>Question: Why does this happen and what can I do to prevent this from happening?</p>