When a keyboard-only user first tabs to a chart with C2M, there is no visual indicator within the chart. The user has to press something before the visual appears. This is unintuitive for a sighted, keyboard-only user.
If the onFocusCallback is called during initial focus, the visual syncing would better align with sighted, keyboard-only user's expectations.
This applies both to the initial focus of the chart, as well as when focus changes between groups of data.
When a keyboard-only user first tabs to a chart with C2M, there is no visual indicator within the chart. The user has to press something before the visual appears. This is unintuitive for a sighted, keyboard-only user.
If the onFocusCallback is called during initial focus, the visual syncing would better align with sighted, keyboard-only user's expectations.
This applies both to the initial focus of the chart, as well as when focus changes between groups of data.