title: How do I know which version of Javascript I'm using?
body: <p>I'm just reading this documentation about Javascript 1.2, but I'm wondering which version of Javascript is being used in the most popular browsers.</p>
  
  <p><a href="http://www.tutorialspoint.com/javascript/javascript_nested_functions.htm" rel="noreferrer">http://www.tutorialspoint.com/javascript/javascript_nested_functions.htm</a></p>