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  2. Usage share of web browsers - Wikipedia

    en.wikipedia.org/wiki/Usage_share_of_web_browsers

    Default user agent strings of most browsers have pieces of strings from one or more other browsers, so that if the browser is unknown to a website, it can be identified as one of those. For example, Safari has not only "Mozilla/5.0", but also " KHTML " (from which Safari's WebKit was forked) and " Gecko " (the engine of Firefox).