pointerevents/ios/touch-action-none.html sets touchAction style and then begins a swipe, but nothing ensures that a rendering update occurred in between, so there's no guarantee that the new touch action regions make it to the UI process before the swipe starts.
TestInvocation::didReceiveMessageFromInjectedBundle(), when receiving the "RunUIProcessScript" message, calls WKPageCallAfterNextPresentationUpdate() so this is just a dup of 209153 *** This bug has been marked as a duplicate of bug 209153 ***