https://caniuse.com/#feat=intersectionobserver https://caniuse.com/#feat=intersectionobserver Lots of Safari versions don't support IntersectionObserver it wou

https://caniuse.com/#feat=intersectionobserver https://caniuse.com/#feat=intersectionobserver Lots of Safari versions don't support IntersectionObserver it would seem. Then again, Safari is the new IE.