title: input losing src
body: <p>If I use the following code without runat="server" the input's src works fine and I see the image coming through.</p>
  
  <pre><code>&lt;div&gt;&lt;input id="testButton" type="image" src="&lt;%=TestButtonImageUrl %&gt;" onserverclick="RedirectTest" /&gt;&lt;/div&gt;
  </code></pre>
  
  <p>url is <a href="https://fpdbs.paypal.com/dynamicimageweb?cmd=_dynamic-image" rel="nofollow noreferrer">https://fpdbs.paypal.com/dynamicimageweb?cmd=_dynamic-image</a></p>
  
  <p>But if I put the runat="server" in, for some reason, I get this for the url:</p>
  
  <pre><code>&lt;div&gt;&lt;input id="testButton" type="image" src="&lt;%=TestButtonImageUrl %&gt;" onserverclick="RedirectTest" runat="server" /&gt;&lt;/div&gt;
  </code></pre>
  
  <p>url is <a href="http://localhost/%3C%=lButtonImageUrl%20%%3E" rel="nofollow noreferrer">http://localhost/%3C%=lButtonImageUrl%20%%3E</a></p>