https://www.w3.org/WAI/PF/testharness/testcases/edit?testsuite_id=1&testcase_id=199 Test File: https://dvcs.w3.org/hg/pfwg/raw-file/default/ARIA/1.0/tests/test-files/roles-properties-supported/roles-properties-supported-listitem-aria-level-1.html
<rdar://problem/13730850>