Any keyboard operable user interface has a mode of operation where the keyboard focus indicator is visible.
The purpose of this success criterion is to ensure that keyboard users are aware which control they are interacting with in a user interface.
How to Meet
Authors need to ensure that there is a visual indicator for the control that currently has focus. This indicator often takes the form of a border or shading around the control.
The following knowledge base pages provide more information about how to address this success criterion for publishing content: