::-webkit-scrollbar what select used with it in this way?

::-webkit-scrollbar what select used with it in this way?
0
#1

html::-webkit-scrollbar also work only on html tag with * not working… then in empty state how selector on all elements?

what selector used here if emptyhere????::-webkit-scrollbar - works on all

html::-webkit-scrollbar - only on html tag

*::-webkit-scrollbar - not work

Thx.

#2

The webkit-scrollbar is used to customize the Browser scroll bar
Take look to this : https://www.w3schools.com/howto/howto_css_custom_scrollbar.asp

#3

Thanks for that but I mean if not select on what element want to use if stay emptyhere::–webkitscrollbar that way on what elements apply? Is not same as * selector as not work with it.