310358 2026-03-20 07:19:18 -0700 Scrolling position cannot be altered on iOS during scroll 2026-03-27 11:10:32 -0700 1 1 1 Unclassified WebKit Scrolling Safari 26 iPhone / iPad iOS 26 NEW https://bugs.webkit.org/show_bug.cgi?id=187449 InRadar P2 Normal --- 1 alexander webkit-unassigned karlcow simon.fraser webkit-bug-importer oldest_to_newest 2192061 0 alexander 2026-03-20 07:19:18 -0700 I have a case where I need to change scroll position mid-scroll and scroll needs to continue from the changed scroll position. It works correctly on Windows with touchpad in both Chrome and Firefox It works correctly on Mac in Chrome, Firefox and Safari It works correctly on Android in both Chrome and Firefox It does NOT work on iOS On iOS when I scroll with my finger touching the screen and during this scroll action I change scrollLeft, the very next touchmove event puts the scroll back to where it would have been if I didn't change scrollLeft. To better understand what I am talking about open this Codepen and try to slowly scroll the container. The scroll position resets every 3 seconds. In every browser and every OS you would see that once the scroll was reset – it will continue just fine from the beginning, even if you didn't let go of the screen/touchpad. On iOS it will still be one continuous scroll, the scroll position reset would flicker for a moment and be ignored after next touchmove. https://codepen.io/waterplea/pen/bNwrgJp 2192950 1 webkit-bug-importer 2026-03-23 17:41:58 -0700 <rdar://problem/173197596> 2192988 2 simon.fraser 2026-03-23 20:36:56 -0700 Is it just the finger-down behavior that you are saying has a problem? Not the flick-scroll? 2193008 3 alexander 2026-03-23 21:48:49 -0700 I think so. I don't know, here's what I'm trying to make, an infinite carousel: https://codepen.io/waterplea/pen/XJjzrQW It takes like just a dozen of LOC and it works perfectly everywhere. Except iOS, as always. Trying to workaround it by changing styles with :active to keep IntersectionObserver from triggering, but then there's this: https://bugs.webkit.org/show_bug.cgi?id=310540 Trying to do it by hand, but then there's this: https://bugs.webkit.org/show_bug.cgi?id=191218 Very basic CSS does not work. Very basic JS events do not work and this is ignored for 8 years. I'm not even sure what am I doing here.