Widget index / Basic controls · Download this HTML
Ready — try the example.
States and behavior
Off/on, pressed feedback, focus, and disabled on state.
Keyboard
Space or Enter toggles the focused button.
Scope and adaptation
Keep the label stable and expose its persistent state with aria-pressed. A momentary command needs no aria-pressed.
Sources
Microsoft preliminary guide (1995), chapters 7–8 · Modern browser accessibility pattern
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.