RESOLVED INVALID 197387
[macOS] scroll event doesn't fire on Visual Viewport API 
https://bugs.webkit.org/show_bug.cgi?id=197387
Summary [macOS] scroll event doesn't fire on Visual Viewport API
Ryosuke Niwa
Reported 2019-04-29 14:22:09 PDT
Apparently we don't fire scroll event on visual viewport API on macOS :(
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Radar WebKit Bug Importer
Comment 1 2019-04-29 14:23:43 PDT
<rdar://problem/50311222>
Ryosuke Niwa
Comment 2 2019-05-02 22:36:15 PDT
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.
Simon Fraser (smfr)
Comment 3 2019-05-03 09:09:11 PDT
Right, that's related to whether you fire scroll events on visual or layout viewport changes.
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