J.3.3 Keyboard Focus

Users must know which object has the keyboard focus at anytime. Avoid confusion by hiding all visual focus indicators and dimming selections that are located in inactive windows (or panes). To highlight the keyboard focus, use colors, fonts, graphics such as rectangles, or magnification. Highlight the keyboard focus audibly by changing the volume, the pitch, or the tonal quality. In addition an accessible Office Open XML implementation should ensure that:

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An object always has the keyboard focus, and the keyboard focus is always visible and obvious. When the focus moves to another element, the new position is obvious. If a UI control currently has the focus, it is visually highlighted. All selections are visually highlighted. The keyboard focus is displayed independently of a selection, allowing support for multiple and non-contiguous selections. The implementation can show a selection that exists in an inactive window or pane; this can be done, for example, by dimming the selection. Only one keyboard focus indicator shows at any one time. Users can place the focus anywhere within the textual content or on any UI control with which they can interact.