Widget index / Basic controls · Download this HTML
Ready — try the example.
States and behavior
Closed/open, selected option, disabled option and disabled control.
Keyboard
Native arrows, type-ahead, Alt+Down and Escape behavior follow the browser and host.
Scope and adaptation
The popup belongs to the browser or OS. Do not promise pixel-identical option menus on every host.
Sources
Microsoft preliminary guide (1995), chapters 7–8
Original implementation; system colors are represented by CSS variables. The default 13 px system-font stack is a readable browser adaptation. The 1995 source is preliminary, not a final product specification. Test the target browser and native host before shipping.