Things to Remember about JavaScript

About <script> element

• language attribute is deprecated and should not be used.
• defer attribute not supported by all browsers
• using “<” in script within a XHTML throws syntax error, you should use CDATA directive
• type attribute should set to “text/javascript” to maximize browser comapatability
• using “</script>” anywhere in the script brakes code execution, if you happen to use you can use “</scri”+”pt>”
• external JavaScript inclusion looks like “< script type=”text/javascript” src=”example1.js” > < /script >”
• use
  < script > < !–
  function sayHi(){
  alert(“Hi!”);
  }
  //– > < /script >

  < script > < !– and //– > < /script > to make sure, non-JavaScript browsers don’t display JavaScript as body content.

Inline V/s External scripts:

External scripts provide following better  maintainability and caching benefits