SOFTWARE AND HARDWARE DETECTION

Modern browsers offer a suite of information about the page's execution environment, which includes browser information, operating system, hardware, and system peripherals. This information can be accessed through a collection of APIs that are found on the window.navigator object. However, the support across browsers for these APIs is far from standardized, and so support should be considered spotty at best.

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NOTE   It is strongly recommended that you investigate browser support for any of these features before using them, as the majority are non-normative and unsupported on many browsers. Furthermore, the features covered here can be unreliable in some cases.

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Browser and Operating System Identification

Although feature detection and user-agent parsing are two ways of identifying the browser that is currently in use, the navigator and screen objects also offer information about the software environment in which the page is...