Yeah, so this is technically bug 1740989 (we should blur the element when it becomes non-focusable). I took a quick look and it seems bug https://github.com/whatwg/html/issues/8225 would be great to get sorted out at least before implementing that. The workaround being trivial seems worth landing / uplifting for now tho. Can anyone test Safari? My understanding is that they don't implement this either and should behave the same way we do...
Bug 1787456 Comment 6 Edit History
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Yeah, so this is technically bug 1740989 (we should blur the element when it becomes non-focusable). I took a quick look and it seems https://github.com/whatwg/html/issues/8225 would be great to get sorted out at least before implementing that. The workaround being trivial seems worth landing / uplifting for now tho. Can anyone test Safari? My understanding is that they don't implement this either and should behave the same way we do...