A visual rotor dial, after the VoiceOver rotor on iOS: when the reader
cycles the rotor, a dial appears over the chart with the modes around its
ring, turns to put the new mode at the top, and fades out.
Purely visual, so aria-hidden: the mode change is already announced
through the rotor area's live region, and a second announcement here would
repeat it. The turn is dropped for readers who ask for reduced motion.
A visual rotor dial, after the VoiceOver rotor on iOS: when the reader cycles the rotor, a dial appears over the chart with the modes around its ring, turns to put the new mode at the top, and fades out.
Purely visual, so
aria-hidden: the mode change is already announced through the rotor area's live region, and a second announcement here would repeat it. The turn is dropped for readers who ask for reduced motion.