`tabindex=0` on non-interactive elments

Rule ID	Keyboard 10
Conformance	Required
Definition	Verify `tabindex=0` on elements with non-interactive `role`s are important for sequential "tab" focus order of the page.
Purpose	Adding `tabindex=0` to non-interactive elements is a legacy accessibility technique to make elements containing instructions and error feedback more discoverable by assistive technology users. There are more modern ways to make instructions and error feedback accessible to people using assistive technologies.
Conformance	Required
WCAG Success Criteria	Success Criterion 2.4.3 Focus Order Other Related Success Criterion: Success Criterion 2.1.1 Keyboard Success Criterion 2.1.2 No Keyboard Trap Success Criterion 2.4.7 Focus Visible Success Criterion 3.2.1 On Focus
Rule Category	Keyboard Support
Rule Scope	Element
First Step	no
aXe Rules	Ensure elements marked as presentational do not have global ARIA or tabindex so that all screen readers ignore them (Minor)
Wave Rules	ARIA tabindex - aria_tabindex (Alert)
Techniques	Adding `tabindex=0` to the container elements for instructions or error feedback can make the information easier to discover by people using assistive technologies.
Information Links	W3C WCAG: Focus Order W3C WCAG: Error Identification W3C WCAG: Info and Relationships HTML: Focus Accessible Rich Internet Applications (WAI-ARIA) 1.2: Managing Focus and Supporting Keyboard Navigation

tabindex=0 on non-interactive elments