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Browser sniffing (also known as browser detection) is a set of techniques used in websites and web applications in order to determine the web browser a visitor is using, and to serve browser-appropriate content to the visitor. It is also used to detect mobile browsers and send them mobile-optimized websites.
The engine powers the Firefox web browser and has used multiple generations of JavaScript just-in-time (JIT) compilers, including TraceMonkey, JägerMonkey, IonMonkey, and the current WarpMonkey. It is the first JavaScript engine , written by Brendan Eich at Netscape Communications, and later released as open source and currently maintained by ...
To perform feature detection tests, Modernizr often creates an element, sets a specific style instruction on that element and then immediately tries to retrieve that setting. Web browsers that understand the instruction will return something sensible; browsers that do not understand it will return nothing or "undefined". Modernizr uses the ...
In the early part of the century, practices such as browser sniffing were deemed unusable for cross-browser scripting. [2] The term "multi-browser" was coined to describe applications that relied on browser sniffing or made otherwise invalid assumptions about run-time environments, which at the time were almost invariably Web browsers.
Thus, layers could be used for browser detection. A JavaScript program would very often need to run different blocks of code, depending on the browser. To decide which blocks of code to run, a JavaScript program could test for support for layers, regardless of whether the program involved layers at all. Namely,
Learn how to enable JavaScript in your browser to access additional AOL features and content.
The encoding of PAC scripts is generally unspecified, and different browsers and network stacks have different rules for how PAC scripts may be encoded. In general, wholly ASCII PAC scripts will work with any browser or network stack. Mozilla Firefox 66 and later additionally supports PAC scripts encoded as UTF-8. [4]
Locating the version of the browser you're using is often the first step when attempting to troubleshoot and fix browser problems. Once you find your browser version, you can use that info to check if you're running the latest software. If not, you can update to the latest version to make sure everything runs the way it's supposed to.