title: Fallback for jquery CDN not working
body: <p>I have the following jQuery CDN fallback on a test page. I am testing locally with chrome and IE. The CDN is not loading. If I use the <code>http://</code> in the CDN it loads, but if I remove it and just use <code>//</code> This makes no sense to me. If the script doesn't load the conditional statement should load it locally, but it's not. If I replace the </p>
  
  <pre><code>document.write('&lt;script src="/scripts/jquery-2.1.1.min.js"&gt;&lt;\/script&gt;')
  </code></pre>
  
  <p>with </p>
  
  <pre><code>document.write('undefined')
  </code></pre>
  
  <p>then I get the word undefined on the page after about 5 seconds. Am I not scaping properly? Here is my html page:</p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;jQuery&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  
  &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;
  &lt;/script&gt;
  &lt;script&gt;
  (window.jQuery || document.write('&lt;script src="/scripts/jquery-2.1.1.min.js"&gt;
   &lt;\/script&gt;'));
  &lt;/script&gt;
  &lt;script&gt;
    $(document).ready(function() {
      alert( "welcome" );
    });
  &lt;/script&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>