That depends largely on your audience, too. I bet the Reddit crowd are almost all up-to-date with whatever browser they are running. A stodgy enterprise or gov

That depends largely on your audience, too. I bet the Reddit crowd are almost all up-to-date with whatever browser they are running. A stodgy enterprise or gov't office might mandate a certain outdated version for internal apps. I'd bet that a small slice of the vast number of websites out there actually target the average user. The ones that do are likely generic portal ("start page") sites, stores with broad appeal (Amazon, Target, B&N), or public services that everybody would access.