Improve accessibly of counter action buttons

[jnahumphreys]

The counter action buttons should:

• provide visual focus style changes
• allow focus when disabled, but prevent action (not allowed cursor)
• be contained within an element of role toolbar, to allow for swifter keyboard navigation
• all buttons within the toolbar should be focusable using keyboard arrow keys
• when a button within the toolbar has focus, the toolbar should receive a visual style change to denote the area has focus
• the toolbar should default to the first non-disabled button on first interaction, on subsequent interactions the last focused button should receive focus, if this button is disabled, we revert to the first focusable button

Example

ARIA toolbar role guide