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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.
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).
For example, if the browser-leak method relies on checking CSS attributes such as the width and height of an element, the inclusion technique must use an HTML element with a width and height property, such as an image element, that changes when a cross-origin request returns an invalid or a differently sized image. [35] [36]
When accepting HTML input from users (say, <b>very</b> large), output encoding (such as <b>very</b> large) will not suffice since the user input needs to be rendered as HTML by the browser (so it shows as "very large", instead of "<b>very</b> large"). Stopping an XSS attack when accepting HTML input from users is much more complex ...
A CSS hack is a coding technique used to hide or show CSS markup depending on the browser, version number, or capabilities.Browsers have different interpretations of CSS behavior and different levels of support for the W3C standards.
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.
SWFObject (originally FlashObject) is an unmaintained open-source JavaScript library used to embed Adobe Flash content onto Web pages and to protect the flash game against piracy, [1] which is supplied as one small JavaScript file.