[accname] add some tests

[xi]

While working on https://github.com/xi/aria-api/ I created some test cases that are not yet covered by wpt. Would be nice if they could be included.

I mostly stuck with the format of existing tests. If desired I can use more expressive titles and descriptions.

[cookiecrook]

looks like this one has been around for a bit. @spectranaut reviews these manual tests now... I'll remove the stale auto-reviewer suggestions soon.

My only feedback is that, since the time that you pushed this PR on 2020, the manual tests moved into a ./manual dir, so it'd be good to move these files there.

Thanks for the PR and sorry it was overlooked for so long!

[spectranaut]

hi @xi, I appreciate the thought and work that went into these tests, unfortunately the manual accname tests have been unmaintained and unused for a while now.

We now have a new way to write automated accname tests specifically, which you can read about here, but we have only just started writing test. If you are still interested in contributing tests, 3 years later, you could help! :)

Without looking too closely, it seems like the tests you wrote here belong with the "name from content" tests, which has a test file and a "to do" to add tests: https://github.com/web-platform-tests/wpt/blob/master/accname/name/comp_name_from_content.html

Closing this PR, but I linked it from the add tests for name from conten issue so who ever works on it can draw inspiration from your work!