Can’t prevent `touchmove` from scrolling window on iOS

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I recently ran into this same problem. You’ll need to pass { passive: false } when registering the touchmove event listener. e.g.

document.addEventListener('touchmove', function(e) {
    e.preventDefault();
}, { passive: false });

This is because document touch event listeners are now passive by default in Safari 11.1, which is bundled with iOS 11.3. This change is documented in the Safari 11.1 release notes:

Web APIs

  • […]
  • Updated root document touch event listeners to use passive mode improving scrolling performance and reducing crashes.

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