@Chrome Q: starting with Chrome 132, you folks made scrollers focusable when they do not contain any focusable children. In practice that yields two problems for me:
1) to make certain areas not scroll through when a backdrop is visible, I create a pseudo element which cacthes scroll by makeing it scrollable and setting overscroll-behavior: contain. Problem now is that the parent element gets focus, even when it has focusable children itself (only the pseudo hasn't)