aria-allowed-attr not returning correct results for aria-roledescription

[straker]

Expectation:
Aria-roledescription should pass for elements/roles listed in #1216 (comment), return incomplete for all other roles, and fail for an element without a role

Actual:

• Fails for <a href="foobar.com" aria-roledescription="foo">foo</a> (valid role but not supported on anchor elements, should incomplete)
• Fails for <div role="button" aria-roledescription="foo">foo</button> (valid role and supported on button elements/roles, should pass)

Motivation: https://github.com/GoogleChrome/web.dev/issues/763

axe-core version: 3.2.2

[dylanb]

@straker Have you thought through the accessibility supported nuances here?

[straker]

Only in terms of the testing I did in #1216 (comment)

[jeankaplansky]

New rule help here: https://dequeuniversity.com/rules/axe/3.4/aria-roledescription

[chandana7393]

Tested, working fine.

Tested Environment:
Axe-coconut - 4.0.0.29104v
Chrome - 77.0.3865.120v
OS - Windows 10 64 bit.