Plan step 19, containment.md C-18. The row was the focusable `region` and the items were not focusable at all, which is the thing M3's accessibility page draws a Don't for: "use Tab to place initial focus on the first carousel item", "avoid focusing on the carousel container". Each item is now `tabindex="0"` with the focus ring drawn inside it, the row is out of the tab order, and from a focused item the arrows move one item (moving focus with them), Home and End go to the ends, and Space or Enter opens one that is not fully in view. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9