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@zachleat reading zachleat.com/web/facepile/#javascript , I wonder why you "cut the mustard" with both
typeof IntersectionObserver
and"forEach" in NodeList.prototype
as it seems all browsers supporting the former also support the later. caniuse.com/#feat=intersectionobserver developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach#Browser_Compatibility