title: doesn't work incorrect canvas with unity integration
body: <p>I try to add image element in canvas like ad banner.</p>
  
  <pre><code>string injection = @"$(""&lt;div id=""UpperBanner""&gt;&lt;img src=""http://mydomain.com/adbanner.png""&gt;&lt;/div&gt;"").insertbefore(""#unityPlayerEmbed"");";
  
  Application.ExternalEval(injection);
  </code></pre>
  
  <p>but, it doesn't work.</p>
  
  <p>there are no image in canvas.</p>
  
  <p>any ideas?</p>