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  2. [A11Y] Make collapsible fieldset accessible

[A11Y] Make collapsible fieldset accessible

Description of the need

Fieldsets that are collapsible should follow the accessibility requirements: https://www.w3.org/WAI/ARIA/apg/patterns/accordion/. We've got <details> in core but the Form API still offers collapsible fieldsets.

Proposed solution

If the fieldset is set to collapsible it should have aria-expanded toggled.

GitHub Link: 
https://github.com/backdrop/backdrop-issues/issues/6408
GitHub Issue #: 
6408

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