197387 2019-04-29 14:22:09 -0700 [macOS] scroll event doesn't fire on Visual Viewport API 2019-05-03 09:09:11 -0700 1 1 1 Unclassified WebKit Scrolling WebKit Nightly Build Unspecified Unspecified RESOLVED INVALID InRadar P2 Normal --- 170982 1 rniwa webkit-unassigned simon.fraser webkit-bug-importer oldest_to_newest 1531294 0 rniwa 2019-04-29 14:22:09 -0700 Apparently we don't fire scroll event on visual viewport API on macOS :( 1531297 1 webkit-bug-importer 2019-04-29 14:23:43 -0700 <rdar://problem/50311222> 1532670 2 rniwa 2019-05-02 22:36:15 -0700 Actually, the current behavior of WebKit matches that of Chrome so this is probably not really a bug. In fact, offsetTop/offsetLeft are always 0 on macOS when it's not zoomed. When we're zoomed, we'd fire scroll events as expected. This is somewhat counterintuitive but it's probably safe to match Chrome's behavior here. 1532784 3 simon.fraser 2019-05-03 09:09:11 -0700 Right, that's related to whether you fire scroll events on visual or layout viewport changes.