Created attachment 460706 [details] The attachment is the minimum Demo of this problem When there are two nested scrolling container，and the inner container can scroll horizontally and the CSS attributes overflow-y is hidden, the outer container can scroll vertically when set position:relative to any element between inner container and outer container, trackpad is connected on ipad and I scroll by touchpad, the behavior is expected when trackpad pointer is outside inner container, but when trackpad pointer is inside inner container, it will trigger the HTML page to scroll.
<rdar://problem/96931314>