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Developed in 1995-6 as a collaboration between Sun and Netscape, the first version of JavaScript appeared as a simple scripting language in Netscape 2.0. It allowed web page authors to create dynamic effects on pages that static HTML could not.
It was developed throughout the 'Browser Wars' of 1996-8, as Microsoft Internet Explorer provided the same language with slightly more capability, and many web pages rely on it currently for roll-over effects (changing a picture when the mouse is moved over it) and to check entry of information into web pages.
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