What Is JavaScript?

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What Is JavaScript?

When JavaScript first appeared in 1995, its main purpose was to handle some of the input validation that had previously been left to server-side languages such as Perl. Prior to that time, a round trip to the server was needed to determine if a required field had been left blank or an entered value was invalid. Netscape Navigator sought to change that with the introduction of JavaScript. The capability to handle some basic validation on the client was an exciting new feature at a time when use of telephone modems (operating at 28.8 kbps) was widespread. Such slow speeds turned every trip to the server into an exercise in patience. Since that time, JavaScript has grown into an important feature of every major Web browser on the market. No longer bound to simple data validation, JavaScript now interacts with nearly all aspects of the browser window and its contents. You can now easily edit JavaScript by JavaScript editor. Even Microsoft, with its own client-side scripting language called VBScript, ended up including its own JavaScript implementation in Internet Explorer from its very earliest version.

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