Question

var ga = document.createElement('script');
ga.type = 'text/javascript'; ga.async = true;
ga.src = ('https:' == document.location.protocol ?
      'https://ssl' : 'http://www') +
      '.google-analytics.com/ga.js';
var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(ga, s); 

While in the above code(in Google Analytics) ,
I wonder why they keep writing ga.type = 'text/javascript' ,
I’ve tried not adding it and it seems working well in modern browser
I thought I should have missed something

Answer 1

It used to be required to pass the XHTML validator (the type attribute). However, every modern browser parsed script blocks as JavaScript anyway.

However, the HTML5 specification says you can leave it off, and it will default to text/javascript.