The WPTs overscroll-deltas.html, scrollend-event-fired-to-document.html, and scrollend-event-not-fired-on-no-scroll.html under imported/w3c/web-platform-tests/dom/events/scrolling are consistently timing out both on WKTR and safaridriver. We should fix these.
input-text-scroll-event-when-using-arrow-keys.html is another WPT in this area that is consistently timing out.
<rdar://problem/117580468>