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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.
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,
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 ...
Canvas fingerprinting works by exploiting the HTML5 canvas element.As described by Acar et al. in: [6] When a user visits a page, the fingerprinting script first draws text with the font and size of its choice and adds background colors (1).
When automatic proxy detection is used, WinHTTP and WinINET in Internet Explorer 6 and earlier send a "Host: <IP address>" header and IE7+ and Firefox sends a "Host: wpad" header. Therefore, it is recommended that the wpad.dat file be hosted under the default virtual host rather than its own.
As JavaScript is the most prevalent scripting language in web browsers [citation needed], many feature detection techniques use JavaScript to inspect the DOM and local JavaScript environment. The simplest technique is to check for the existence of a relevant object or property.
Learn how to enable JavaScript in your browser to access additional AOL features and content.
Subsequent releases of JavaScript and JScript would implement the ECMAScript standard for greater cross-browser compatibility. After the standardization of ECMAScript, W3C began work on the standardization of Document Object Model (DOM), which is a way of representing and interacting with objects in HTML , XHTML and XML documents.