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JavaScript is an alternate to flash technologies (in a way atleast) as it provides transition and other other animation effects. The automatic updates without refresh of page (which you see in fb) is thanks to JavaScript. These are the obvious things which most users can notice.

Others important functions like web service via json and client side validation is also possible but they happen at back-end and only errors are seen on front end

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12y ago

What else can I help you with?