I just noticed that there are issues with tabbing through the new administrative menu for Drupal 8. I was able to toggle the horizontal orientation for the menu. The issue is with trying to tab into the lowest level menu items. It's not possible to do so right now. See the attached image (anything in red is not accessible through tabbing).
| Attachment | Size | Status | Test result | Operations |
|---|---|---|---|---|
| Screen Shot 2013-02-23 at 12.01.15 PM.png | 41.26 KB | Ignored: Check issue status. | None | None |