> This business isn't able to provide a usable web presence.
Define "usable". It's certainly usable if you are not on IE and, if the resources they'd use to support IE in addition to others are diverted into new and useful features, I'm happy.
Even if you use feature detection, you'll still have to test on IE (and, to do it right, you'1l have to test on a matrix of 3 or 4 OSs (XP, Vista, 7, 8) and 4 browser versions (7, 8, 9 and 10). If IE breaks, you'll still have to fix it in ways other browsers don't break. That costs money.
Define "usable". It's certainly usable if you are not on IE and, if the resources they'd use to support IE in addition to others are diverted into new and useful features, I'm happy.
Even if you use feature detection, you'll still have to test on IE (and, to do it right, you'1l have to test on a matrix of 3 or 4 OSs (XP, Vista, 7, 8) and 4 browser versions (7, 8, 9 and 10). If IE breaks, you'll still have to fix it in ways other browsers don't break. That costs money.