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Originally Posted by mandy
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Browsers give out certain info, which can be useful to developers who can then tailor the javascript on webpages to suit a certain browser. Although there is a standard to which browsers should stick, they often don't and so a javascript command which works for one will have no effect on another. To get round this many pages will query the browser that opens it and obviously this info can then be written to the page if the developer decides to. I guess some people think it's a nifty little thing to have.