When an element becomes fullscreen, all other showing popover elements should be hidden. Spec PR: https://github.com/whatwg/fullscreen/pull/204 WPTs: https://wpt.fyi/results/html/semantics/popovers/popover-top-layer-combinations.html https://wpt.fyi/results/html/semantics/popovers/popover-top-layer-interactions.html
This is already implemented. *** This bug has been marked as a duplicate of bug 252297 ***