Goal
After a confirmed back gesture at the child tab entry point, return to its valid opener without visible focus problems.
Acceptance criteria
- Require a verified opener relationship before closing anything.
- Activate the opener and close the child in the most reliable order.
- Never close manually opened tabs or tabs with missing openers.
- Fall back safely on restricted and browser-internal pages.
- Support nested child tabs.
- Handle API failures without leaving the wrong tab focused.
Goal
After a confirmed back gesture at the child tab entry point, return to its valid opener without visible focus problems.
Acceptance criteria