title: Which method of binding a javascript event with jquery's on is more performant?
body: <p>Let's say you have a web page with forms, and you want to trigger a handler whenever one of those forms is submitted, or whenever a form that is added to the page at a later point in time is submitted. Which method is better:</p>
  
  <pre><code>$('form').on('submit', handler);
  </code></pre>
  
  <p>or</p>
  
  <pre><code>$(document).on('submit', 'form', handler);
  </code></pre>