Many of the examples in that doc are Android < 4.1 (0.06%), IE < 9 (0.48%), Firefox < 24 (~0.1%), etc. Even IE 9-11 is only 4% of the market these days.
The browser-compatibility story is dramatically different from when JQuery was created in 2006. All of the major browsers have been auto-updating for several years now.
https://docs.google.com/document/d/1LPaPA30bLUB_publLIMF0Rlh...