I don't see the Chromium Edge behavior on my Windows laptop either. It looks Chromium Edge allows overscrolling on both directions even if the page in question is not scrollable either directions. Presumably we can just allows overscrolling on the root scroller even if it's not scrollable on all platforms. Note about the interactions with swipe navigation on Mac, overscrolling only happens in the directions where history navigation can __not__ happen, i.e. if there is no forward history, then overscrolling happens on swiping right to left, in other words, overscrolling doesn't happen on swipe left to right if there's backward history. This principal seems to be also effective even if swipe navigation is disabled by the system setting.
Bug 1704080 Comment 5 Edit History
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I don't see the Chromium Edge behavior on my Windows laptop either. It looks Chromium Edge allows overscrolling on both directions even if the page in question is not scrollable either directions. Presumably we can just allow overscrolling on the root scroller even if it's not scrollable on all platforms. Note about the interactions with swipe navigation on Mac, overscrolling only happens in the directions where history navigation can __not__ happen, i.e. if there is no forward history, then overscrolling happens on swiping right to left, in other words, overscrolling doesn't happen on swipe left to right if there's backward history. This principal seems to be also effective even if swipe navigation is disabled by the system setting.