With so many new features being added to browsers lately it is easy to forget, that not all browsers on old devices are updated, be it older iPad or even laptop with ChromeOS. Dear web developers, please don't forget to add fallbacks or polyfills for older devices.
I care as much about outdated browsers as I care about Internet Explorer. If you want a modern experience, buy devices that allow you to update the browser (or complain to your manufacturer that you can't).
Every other website has given up on my old second hand iPad, there are no new apps available for it and the old APIs are all shut down. Why should I still care about it as a web developer? It's still a nice device to read PDFs on.