Create test title for DPUB-ARIA values

The TIES is working with the browser vendors to make sure the DPUB-ARIA values are included as part of their markup. We need to work with the AT Vendors to make sure the semantics are properly presented. A test title would help us with this testing.

No file, test, or entry point is named. Start by reviewing the repository's existing accessibility tests and how DPUB-ARIA values are represented in EPUB markup, then clarify which test title is needed and how AT-vendor semantics should be verified. Done should include an agreed test title and a test that supports this validation.

Written by the indexing model from the issue text.