Accordions violate accessibility requirements of WCAG 2.1

When I run a scan with axe-core DevTools on a page containing an accordion made with your widget, I get a critical error indicating that for the element with a 'tablist' role "Element has children which are not allowed: [role=tabpanel]". The ARIA Authoring Practices Guide (APG) examples at https://www.w3.org/WAI/ARIA/apg/patterns/accordion/examples/accordion/ seems to show accordions shouldn't use tab roles at all.

Thanks for the report. Does the issue you describe exist when jQuery UI 1.12.1 is used or only with jQuery UI 1.13.0 or newer?

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