title: Sharing to Google+ doesn't work
body: <p>I'm creating a cross-platform mobile app using HTML + JS + CSS. I want to share a custom text in Google+. I have the following code segments:</p>
  
  <pre><code>        &lt;button class="demo g-interactivepost"
              data-clientid="xxx.apps.googleusercontent.com"
              data-contenturl="https://developers.google.com/+/web/share/interactive"
              data-calltoactionlabel="INVITE"
              data-calltoactionurl="http://developers.google.com/+/web/share/interactive?invite=true"
              data-cookiepolicy="single_host_origin"
              data-prefilltext="I just tried the quiz. Check it out for yourself!"&gt;
              Google+
          &lt;/button&gt;
  
  &lt;script type="text/javascript"&gt;
      (function() {
          var po = document.createElement('script');
          po.type = 'text/javascript';
          po.async = true;
          po.src = 'https://apis.google.com/js/client:plusone.js';
          var s = document.getElementsByTagName('script')[0];
          s.parentNode.insertBefore(po, s);
      })();
  &lt;/script&gt;
  </code></pre>
  
  <p>Please note that I have already created a Google+ App, and got my client id, though I didn't do any changes to the app, cause I don't know whether I need to enable or disable something on Google Developer Console. On the other hand, in the above code segment I have replaced the "xxx" part with my client ID. The point is that when I press the button, it opens the the sign-in page from Google and after successful sign in, this page displays: <a href="http://prntscr.com/3oa1j7" rel="nofollow">http://prntscr.com/3oa1j7</a>
  But at that point wherever I press, I get just a blank screen. If anyone can help me fix the problem, I would be glad.</p>