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JavaScript particularly useful for multi-frame windows and for manipulating forms without complex CGI (Server Side) scripts
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Here it can be much faster as purely client side whereas a CGI based form has inevitable delays as requires server-client communication and invocation of a new process on server side.
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Java shares this advantage
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This client side processing speed can be essential in some applications as users would not accept long delays (several seconds) on "trivial" mouse clicks
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Java is a broad industry standard with a careful well documented design
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JavaScript comes from Netscape but is supported by Microsoft.
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It has a poorly documented (and thought through ?) basic design
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