Plan step 32, found by the Browser suite. Since containment.md C-18 put the tab stop on each item, the item itself matches the selector for interactive controls, so every press on an item read as a press on a control inside it and never scrolled a partly hidden item into focus. A mouse press still worked through the focus it gives the item; an activation that clicks without focusing, as a test or assistive technology does, did nothing. Only a control other than the item counts now. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9