Created by: artyomtrityak
Buttons hover state for btn class does not have cursor: pointer or cursor: not-allowed as it used to be in v3.
Even for CSS spec cursor: pointer is primarily designed for links (<a/> tag) it is still very useful for modern web to have indication that this button is clickable via cursor change.
Optional: cursor: not-allowed is much less viable but to be consistent and keep backward compatibility it was added either.
It is possible to check difference here: v3 http://getbootstrap.com/components/#btn-dropdowns v4 https://v4-alpha.getbootstrap.com/components/buttons/