[TAB] to navigate around, [ENTER/SPACE] when a link or button gets focused
use browser's default focus outline
radio 1 radio 2 radio 3
checkbox 1 checkbox 2 checkbox 3
option (default) option 1 option 2 option 3
i am a link, try ENTER/SPACE
i am a button, try ENTER/SPACE
i am a p, with tabIndex = 0, try ENTER/SPACE