[yread]

jquery. It just works. It has all the polyfills I've needed

[azangru]

Polyfills? In jQuery?

Even gov.uk has removed jQuery from its dependencies; and their browser support requirements would make a frontend developer cry.

[yread]

Well they don't call it polyfills but they implement e.g. Promise in their own way. And I've used it in the past so to get rid of jquery I would have to rewrite that code to use the native one now. For approx. 0 benefit to the end user.