I think the root of the problem is that browser vendors break stuff all the time. A new browser comes out and now breaks your ten year old web page ... Then the web dev team says fuck it we'll only support Firefox and Chromium, and start using features that only works on those browsers.

Ten years ago, web dev was all about getting your page to work on all platforms. But today we have hundreds of possible combinations of OS x Browser x Extensions, so it's just impossible.

I try to only use browser features that are three years old and "standard". But not even that works.

Phone/Ipad browsers are the biggest offenders of breaking stuff.