The "overflow" event is non-standard: https://developer.mozilla.org/en-US/docs/Web/API/Element/overflow_event yet we have code for it (see OverflowEventDispatcher). caniuse.com says we don't support it: https://caniuse.com/mdn-api_element_overflow_event so that's confusing.
<rdar://problem/71129110>
Blink Commit - https://src.chromium.org/viewvc/blink?view=revision&revision=198689
Blink commit (Chromium GitHub repo) - https://github.com/chromium/chromium/commit/86665f61dc951e5aca388badd7b82a1691c8beb6
Draft PR - https://github.com/WebKit/WebKit/pull/29497