Usage share of web browsers - aggregated from several surveys [Wikipedia]

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Usage share of web browsers from Wikipedia, the free encyclopedia
The usage share of web browsers is the percentage of visitors to a group of websites that use a particular web browser. For example, when it is said that Internet Explorer has 66% usage share, it means that some version of Internet Explorer is used by 66% of visitors that visit a given set of sites.
Typically, the user agent string is used to identify which browser a visitor is using.