Prevent iOS 11.3 overflow bouncing

In addition to gluttonys answer:

window.addEventListener("touchmove", function(event) {event.preventDefault();}, {passive: false} );

is for me a working solution for the safari bounce issue.

It was caused by a bug of WebKit. Bug 182521

Try

window.addEventListener("touchstart", function(event) {
  event.preventDefault();
}, {passive: false});

as a workaround.

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