[EnderMB]

One of my last jobs was at an agency that handled the digital account for a very large airport in the UK. They get a lot of traffic, and quite a high percentage of users using legacy browsers, probably from businesses looking up flight info and trying to book stuff.

I can't remember how high it was, but let's say it was around 10%. We were told that we had to support all the way down to IE6. To do so, we raised our prices, almost constantly during that project, and they happily paid it. At that level, an agency can change thousands for legacy browser support, and the client will happily pay, because in their mind that 10% will spend far more money than what we can charge.

With that in mind, that's how I view browser specifications today. For clients with an existing website, I check what percentage of their users use legacy browsers, and work out with them whether the cost of supporting these users against the potential benefit. A lot of developers and agencies simply won't do this because they either can't or won't find a solution for legacy browsers.