grid role tests

[cookiecrook]

E.g. an orphaned cell is not a cell, it needs to be in a table>row>cell context, etc.

follow-on from #8

[cookiecrook]

See html-aam/table-roles.html
Then add a new file wai-aria/role/grid-roles.html
Or add to the existing one.

[howard-e]

Hello @cookiecrook. I'm Howard with Bocoup, and would like to contribute to the testing of this (and other wai-aria related roles).

I've been looking through the other tests and discussions, and wondering if you could take a look at web-platform-tests/wpt#41323 to let me know if I'm on the right track here? I'd be happy to assign myself to some of the others if so (listbox, menu, etc)

[cookiecrook]

Hi Howard, for future reference, if you include "Closes (link to issue)" or "Resolves (link to issue)" in the PR description instead of "See (link to issue)", the Issue and PR records will be linked automatically. Please assign yourself to any issue you're working on. Thanks.

I have approved your PR with one editorial change to the naming of the contextual invalidation tests.

[howard-e]

Hi Howard, for future reference, if you include "Closes (link to issue)" or "Resolves (link to issue)" in the PR description instead of "See (link to issue)", the Issue and PR records will be linked automatically. Please assign yourself to any issue you're working on. Thanks.

Okay thanks

I have approved your PR with one editorial change to the naming of the contextual invalidation tests.

Thanks, I've committed the suggestion

[howard-e]

Filed the following browser bugs:

• https://bugzilla.mozilla.org/show_bug.cgi?id=1849160
• https://bugs.chromium.org/p/chromium/issues/detail?id=1473647
• https://bugs.webkit.org/show_bug.cgi?id=260348