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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.
Modernizr uses feature detection, rather than checking the browser's property, to discern what a browser can and cannot do. It considers feature detection more reliable since the same rendering engine may not necessarily support the same things in two different browsers using that engine.
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.
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).
JavaScript (/ ˈ dʒ ɑː v ə s k r ɪ p t /), often abbreviated as JS, is a programming language and core technology of the World Wide Web, alongside HTML and CSS. Ninety-nine percent of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
The fingerprinter could determine which sites the browser had previously visited within a list it provided, by querying the list using JavaScript with the CSS selector :visited. [ 43 ] : 5 Typically, a list of 50 popular websites were sufficient to generate a unique user history profile, as well as provide information about the user's interests.
The threat involves using a PAC, discovered automatically by the system, to redirect the victim's browser traffic to an attacker-controlled server instead. Another issue with pac-file is that the typical implementation involve clear text http retrieval, which does not include any security features such as code signing or web certificates.