Review all focusable elements to determine their states.
checked/uncheckedchecked/uncheckedexpanded/collapsedThis example starts collapsed. Activate the button to see the expanded state, and to see the accessible name change along with it.
This content is only shown once the button above is expanded.
checked/uncheckedThis example starts unchecked. Activate it with a click, or with the keyboard using Space, to see the checked state.