This is where clearly specifying a browser support list at the beginning of a web project (or regularly updating one for long projects) helps to set those expec

This is where clearly specifying a browser support list at the beginning of a web project (or regularly updating one for long projects) helps to set those expectations. We have a list updated quarterly based on browsers with 5%+ market share that is baked into any requirements that clients sign off on, with additional time/money required for supporting anything outside of the list. Saved our bacon many times when it turns out the client is using a 9 year old Firefox browser they refuse to upgrade, or it turns out one particular branch office is still stuck on IE8 (true stories...)