Scroll container

A scroll container is an element box in which content can be scrolled, whether or not scroll bars are present. A user agent adds scroll bars to an element box to make it a scroll container when the CSS overflow property is set to scroll or when overflow is set to auto and the content overflows the container.

When the content of an element box overflows its bounding box, users can use scroll bars to scroll through the clipped content that is otherwise hidden from view.

A scroll container includes a scrollport and scroll bars.