Yeah, WebKit is old, but it wasn't until Chrome came along that it actually made inroads in Windows browser share -- and let's face it, that was the platform that developers focused on for over a decade, until the recent smartphone/tablet revolution.
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Hrm, well, it is Firefox that went from nothing to 25-30% in a few years: http://en.wikipedia.org/wiki/File:Browser_Wars.svg
Yeah, WebKit is old, but it wasn't until Chrome came along that it actually made inroads in Windows browser share -- and let's face it, that was the platform that developers focused on for over a decade, until the recent smartphone/tablet revolution.