PASS if <link href> element maps to one of the following:

MSAA + UIA Express role

MSAA + IAccessible2 role and

other IAccessible2 features

ATK/AT-SPI role

Mac OS X

AXRole
AXSubrole
AXRoleDescription

ROLE_SYSTEM_LINK + STATE_LINKED

Also, expose STATE_LINKED on all descendants

ROLE_SYSTEM_LINK + STATE_LINKED

Also, expose STATE_LINKED on all descendants

IAccessible2: Use AccessibleHypertext interface
ROLE_LINK AXLink
<nil>
'link'

FAIL otherwise.