Example 2:

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What is JavaScript?
JavaScript is a scripting language originally developed by Netscape to add interactivity and power to web documents. It is purely client side, and runs completely on the client's browser and computer.
Difference betwen Java & JavaScript?
Java is completely different from JavaScript- the former is a compiled language while the later is a scripting language.
What is Ajax?
Ajax is a group of inter-related web development techniques used for creating interactive web applications. A primary characteristic is the increased responsiveness and interactiveness of web pages achieved by exchanging small amounts of data with the server "behind the scenes" so that the entire web page does not have to be reloaded each time the user performs an action. This is intended to increase the web page's interactivity, speed, functionality, and usability.

Reload page and select the 1st, 2nd, and 3rd contents using a URL parameter


click here.