Screen reader says the wrong count in Preferences modal due to missing `radiogroup`

[lindapaiste]

Increasing Access

We want the editor to be fully navigable using screen readers.

Feature enhancement details

I downloaded a screenreader and I'm playing around and finding issues. In the preferences modal it announces like this:

"Autosave on checked radio button 4 of 11"

It should be announcing "1 of 2" instead of "4 of 11" (where 1 is "on" and 2 is "off"). But it uses the total count of the radio buttons in the form because we do not have the radiogroup attribute around each "on/off" section.

Might make sense to address this after #2323 so that we only need to change it in one (or two) places instead of many.

Resources:
https://www.w3.org/WAI/ARIA/apg/patterns/radio/examples/radio/
https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Roles/radiogroup_role

[KrishavRajSingh]

is this open?