Definition:

Javascript has been created by Netscape as a scripting language. It is employed for building user-friendly web pages.

Information:

Sustained by both Microsoft Internet Explorer and Netscape Navigator, Javascript is a famous customer-based scripting language. However, both the above platforms differ in their application. Therefore, one should definitely test it to check its compatibility for cross-browser applications.

There are two ways Javascript can be put: on each page and in an extrinsic document sought by required pages. The latter option is suitable for codes that duplicate multiple times on pages because it is capable of saving the time it takes to download and also avoids any trouble by search engine spiders.