To enable the keyboard navigation, add keyboard option in slider options list. The option possible values are listed below
true– Enables keyboard navigationonhover– Enables keyboard navigation only when mouse cursor is over the slider.focus– Enables keyboard navigation only when the slider is focused.both– Enables keyboard navigation when mouse is over the slider or slider is focused.false– Disables keyboard navigation.
Note: Keyboard navigation is added by keyboardNav addon and may available in the slider script package. For more info check Building slider script article.