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Chapter 28. Introduction to JavaScript > Handling Multiple Browsers

28.4. Handling Multiple Browsers

Unlike CGI scripts, which run on the server and don't require any particular intelligence on the part of the browser, JavaScript code is completely dependent on browser support. If you put a script on your page, browsers that don't understand JavaScript won't know what to do with it. As I mentioned earlier, these browsers will interpret the code as straight text, and the result is rather unpleasant.

It's even more unpleasant, however, when your code isn't completely understood by a JavaScript-aware browser. As we've already discussed, different browsers, and different versions of the same browser, support different versions of JavaScript. A poorly written script can generate error messages or even crash a user's browser, which discourages return visits. Fortunately, JavaScript provides ways to target the browsers that understand specific JavaScript elements.


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