“What browser should this be tested in?” Remember 2003, when that question was rarely asked because there was virtually only Internet Explorer? Or 2006, when you could get away with just IE6 and Firefox 1.5? 5 years later the browser landscape has become a lot more complex. You’ve don’t only have to consider Internet Explorer, Firefox, Chrome, Safari and maybe even Opera and mobile, there’s browser versions to worry about as well!
On one hand there’s Internet Explorer, with no less then 4 versions in the wild (cfr. chart on the left, data source: statcounter.com). According to MS’s own IE6countdown, IE6 is down to 1.9% market sharee in Belgium (but 10.7% worldwide), so we might as well forget about that dinosaur, except maybe if you’re in a b2b-context? But that still leaves you with IE7, IE8 and IE9. Check your visitor stats, because your mileage may vary, but you’ll probably want to focus on IE8 (the “stable” version) and IE9 (the “new stable”).
Google Chrome is the example of a radically different approach. There’s a new version approximately every 6 weeks, with users upgrading to the latest stable version automatically. The impact of such a rapid release schedule can seen in the chart on the left (data source: statcounter.com).
Anyway, there’s no silver bullet, so what is your approach?