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The JavaScript FAQ
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Browser Version

Question: How do I detect the browser version?

Answer: Unfortunately, the value of navigator.appVersion is no good for detecting the browser version. For example, in many JavaScript-aware browsers, the navigator.appVersion value is meant to be the number of compatible Netscape Navigator version rather than the version of the user's actual browser. (Even in the early days of JavaScript, Microsoft Internet Explorer 3 used to return the string navigator.appVersion that began with 2, which was intended to reflect the compatibility with Netscape Navigator 2.)

Thus, to get the full version number of any of the above browsers, you need to rely primarily on the navigator.userAgent string, like in the Browser Name code example. Here is your browser's name and version:

(Source code can be found in the Browser Name article.) Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
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  Mirrored with kind permission of Alexei Kourbatov Design by Interspire