title: Is it possible to add my custom JS file so page DOM could access it?
body: <p>The problem now is that if I add some DOM elements I must put all JS inside tags creating huge mess in code for example:</p>
  
  <pre class="lang-html prettyprint-override"><code>&lt;div onclick='//js monstrous oneliner with function declarations and so on..
                //that must be repeated many times multipcating the whole mess..
    '&gt;
   Here some pure html thing.
  &lt;/div&gt;
  </code></pre>
  
  <p>So can I add my custom JS file into rendered document in the same way as I'm able to add DOM elements ?</p>