title: What is the HTML Interaction Tag
body: <p>I have seen some embed codes provided as <code>&lt;interaction&gt;</code> tag. For instance, <a href="http://apester.com/" rel="nofollow">Apester</a>'s so-called HTML5 embed code goes like this</p>
  
  <pre><code>&lt;interaction id="57b6f819336e03ca34e0fb8b"&gt;&lt;/interaction&gt;
  </code></pre>
  
  <p>I have seen this with other providers of embed codes before (well at least once), but I can't find anything on this tag, not at W3C, WHATWG or MDN. I am wondering, what is this, how does it work and where can I read about it?</p>