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The various client-side technologies differ in many ways, starting with the way they get loaded and executed by the web client. JavaScript is a scripting language, whose code is written in plain text and can be embedded into HTML pages to empower them. When a client requests an HTML page, that HTML page can contain JavaScript. JavaScript is supported by all modern web browsers without requiring users to install new components on the system.
JavaScript is a language in its own right (theoretically it isn’t tied to web development), it’s supported by most web clients under any platform, and it has some object-oriented capabilities. JavaScript is not a compiled language so it’s not suited for intensive calculations or writing device drivers and it must arrive in one piece at the client browser to be interpreted so it is not secure either, but it does a good job when used in web pages.
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