title: Error with Google Web App targeting an iframe
body: <p>Tried using both frames and iframes. </p>
  
  <p>On local host: frameset.html:</p>
  
  <pre><code>&lt;iframe src=a.html name="a" width="200" height="200" align="right"&gt;&lt;/iframe&gt;
  &lt;iframe src=b.html name="b" width="200" height="200" align="left"&gt;&lt;/iframe&gt;
  </code></pre>
  
  <p>b.html has a link that opens up the Google Web App,
  <a href="https://script.google.com/macros/s/a-web-app-id/dev" rel="nofollow">https://script.google.com/macros/s/a-web-app-id/dev</a>, in a pop-up (I'd use an iframe, however apps-script web apps are only capable of running in their own tab/window). </p>
  
  <p>The web app, running as an htmlservice in IFRAME mode has this link:</p>
  
  <pre><code>&lt;a target='a' 
  href="https://script.google.com/d/some-script-id/edit?usp=drive_web"&gt;
  where does this same origin link open?&lt;/a&gt;
  </code></pre>
  
  <p>Rather than the link being opened in the frame a of frameset.html, it opens in a new tab each time it is clicked (so N clicks, N tabs open). When I set b.html to open a local pop-up (c.html) with the same link above, it works fine however.</p>
  
  <p>Console log in the apps script popup:</p>
  
  <pre><code>https://script.google.com/macros/s/a-web-app-id/dev 
  Failed to load resource: net::ERR_CACHE_MISS
  
  https://some_string-script.googleusercontent.com/userCodeAppPanel
  Failed to load resource: net::ERR_CACHE_MISS
  </code></pre>