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Browser support: All JavaScript enabled browsers support javascript: Netscape Navigator 2, Netscape Navigator 3, Netscape Navigator 4, Internet Explorer 3, Internet Explorer 4, Internet Explorer 5, Opera 3.x
Ease of use: JavaScript is easy to use.
Complexity, learning curve: JavaScript is easy to learn. It gets more complicated as and when you try to do more complicated tasks.
Location of JavaScript code: In the document or page loaded into the browser.
Flexibility: Cannot (must not) read or write to files.
Limitations of technology: Cannot (must not) read or write to files. You have to always write code that is backwards compatiable. Your code must work on Netscape Navigator 3 and Internet Explorer 3, possibly even Netscape Navigator 2.
Requirements (hardware): A computer that has an Operating System that is supported by either Microsoft Internet Explorer of Netscape Navigator. Netscape Navigator is better as it is provided for far more Operating Systems than Internet Explorer.
Cost: Netscape Navigator - Free. Internet Explorer - Free.
Support (help): Free, i.e. none. Except that available in news:comp.lang.JavaScript
Platform independence: Netscape Navigator - yes, Internet Explorer - no.