HTML-AAM: MSAA+IA2 for header and footer with ancestor body should match #59

From @jasonkiss on September 28, 2016 3:30

footer with ancestor body has MSAA ROLE_SYSTEM_GROUPING and IA2_ROLE_FOOTER. Shouldn't header with ancestor body also take ROLE_SYSTEM_GROUPING in addition to IA2_ROLE_HEADER?

@asurkov?

Copied from original issue: w3c/aria#438