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One of the most common uses of javascript on website is for tracking code. There are dozens of other purposes for Javascript on web pages. Javascript maybe used to display popup messages, add effects to web pages, customize the graphical aspects of a web page easily and even create games with basic functionality. Javascript also allows developers and users to have extra functionality than what the website provides by default by using third party browser add-ons like Greasemonkey.

Javascript is a relatively simple programming languages consisting usually of small pieces of code to make web pages more interactive to the user. They require a web browser that supports Javascript and also the setting needs to be enabled on the browser. Today, virtually every website use snippets of javascript to incorporate certain features for the webmaster and/or website user. Website analyzing services state that approximately 5% of internet users have disabled Javascript functionality on their website.