title: 3rd party Add to Calendar dropdown doesn't show in child page
body: <p>I want an 'add to event' button with a dropdown displaying a couple of options. For this, I use <a href="https://www.addevent.com/buttons/add-to-calendar" rel="nofollow noreferrer">AddEvent.com</a></p>
  
  <p>This works perfectly well in the <code>index.html</code> page but the problem is that the javascript can not reach the child page. (or at least it seems so)</p>
  
  <p>The guide says to add this script in the <code>head</code></p>
  
  <pre><code>&lt;script type="text/javascript" src="https://addevent.com/libs/atc/1.6.1/atc.min.js" async defer&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Then you just place a <code>div</code> which looks like the following</p>
  
  <pre><code>&lt;div title="Add to Calendar" class="addeventatc"&gt;
      Add to Calendar
      &lt;span class="start"&gt;12/29/2016 09:00 AM&lt;/span&gt;
      &lt;span class="end"&gt;12/29/2016 11:00 AM&lt;/span&gt;
      &lt;span class="timezone"&gt;Europe/Amsterdam&lt;/span&gt;
      &lt;span class="title"&gt;Summary of the event&lt;/span&gt;
      &lt;span class="description"&gt;Description of the event&lt;br&gt;Example of a new line&lt;/span&gt;
      &lt;span class="location"&gt;Location of the event&lt;/span&gt;
      &lt;span class="organizer"&gt;Organizer&lt;/span&gt;
      &lt;span class="all_day_event"&gt;false&lt;/span&gt;
      &lt;span class="date_format"&gt;MM/DD/YYYY&lt;/span&gt;
   &lt;/div&gt;
  </code></pre>
  
  <p>Now like I said, this works in the <code>index.html</code> but not in  (f.e.) <code>page1.html</code>. I thought the problem might be within the 3rd party's javascript file, but I cannot make sense of the file that is shown when I enter that URL. ("<a href="https://addevent.com/libs/atc/1.6.1/atc.min.js" rel="nofollow noreferrer">https://addevent.com/libs/atc/1.6.1/atc.min.js</a>")</p>
  
  <p>Plunker to demonstrate my problem: <a href="https://plnkr.co/edit/kqRfCzM2BzuAAD1CV8FZ?p=preview" rel="nofollow noreferrer">AddEvent-ng2-Plunker</a></p>