title: Onkeyup is not working
body: <p>Although I can see an "onkeyup" event in the chrome console, for whatever reason, the event is not firing.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="true">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>var el = document.getElementById("userInput");
  el.addEventListener("onkeyup", function() {
      alert('yahoooo0');
  });</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;input type="text" id="userInput" name="food"/&gt;
      
      </code></pre>
  </div>
  </div>
  </p>