Scrollbar
Noun · Development
Definitions
A UI control along the edge of a scrollable area that indicates the current viewport position within the total content and allows users to navigate by dragging or clicking, styled via pseudo-elements like `::-webkit-scrollbar` or the newer `scrollbar-width` and `scrollbar-color` CSS properties.
In plain English: The bar on the side of a window that shows how far you've scrolled and lets you drag to jump around.
Example: "The designer wants a thin translucent scrollbar on the sidebar — use scrollbar-width: thin and scrollbar-color for cross-browser support."