Correct details of UIEvent.detail for Internet Explorer (#4841)
Correct details of UIEvent.detail for Internet Explorer (#4841)

* Update Safari compat data for KeyboardEvent.isComposing

* Update MouseEvent.buttons data for Safari

* Update api/MouseEvent.json

Co-Authored-By: Queen Vinyl Darkscratch <fa3c3b2c35dab953db0f41b36615b5269c1e82df@gmail.com>

* Correct details of UIEvent.detail for IE11

* clarify mousedown/mouseup count

mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data