Tests:
Test 1
Authors are NOT RECOMMENDED to use the aria-grabbed attribute, as it has been deprecated since ARIA 1.1, and has generally poor support.
element with aria-grabbed=true
Expected result:
warn authors aria-grabbed has been deprecated and may not have sufficient support.
Test 2
Authors are NOT RECOMMENDED to use the aria-dropeffect attribute, as it has been deprecated since ARIA 1.1, and has generally poor support.
element with aria-dropeffect=copy
Expected result:
warn authors aria-dropeffect has been deprecated and may not have sufficient support.