scroll constant
OverflowValue
const scroll
Overflow content is clipped at the element's padding box, and overflow content can be scrolled into view using scroll bars. User agents display scroll bars whether or not any content is overflowing, so in the horizontal and vertical directions if the value applies to both directions. The use of this keyword, therefore, can prevent scroll bars from appearing and disappearing as content changes. Printers may still print overflow content. The element box is a scroll container.
Implementation
static const OverflowValue scroll = OverflowValue._('scroll');