212439 2020-05-27 15:23:12 -0700 Horizontally scrolling elements are broken when revealed by toggling visibility 2020-06-08 22:29:27 -0700 1 1 1 Unclassified WebKit Scrolling Safari 13 iPhone / iPad iOS 13 RESOLVED FIXED InRadar P2 Normal --- 1 cesium simon.fraser changseok esprehn+autocc ews-watchlist fred.wang glenn jack.palmer kondapallykalyan pdr simon.fraser webkit-bug-importer zalan oldest_to_newest 1656619 0 400388 cesium 2020-05-27 15:23:12 -0700 Created attachment 400388 minimal test case The expected behavior for scrolling is that when beginning a swipe in a horizontal direction on an element that can scroll horizontally, the element scrolls and vertical page scrolling is locked. (Sorry, I'm not sure if there's a technical term for this.) The buggy behavior is that vertical page scrolling is not locked, so that swiping diagonally or in a circle (for example) will scroll both the carousel and the page simultaneously, which isn't disastrous but is quite annoying. To reproduce, open the attached HTML file in iOS Safari. There are three horizontally scrolling elements on the page, two of which are initially hidden. The first, unhidden scrollable displays the expected behavior. The second and third scrollables, after being unhidden, display the buggy behavior. There appear to be three requirements: 1. The scrollable must be initially hidden. visibility: hidden triggers the bug; I think display: none does not. 2. The scrollable must have certain styles set. position: relative and -webkit-overflow-scrolling: touch both seem to trigger the bug. 3. The page must have a touchmove event handler set. If the page does not have a touchmove handler, I see different buggy behavior where the second and third scrollables don't scroll at all. (The first is still unaffected.) Also, the scrollable does not have momentum even if -webkit-overflow-scrolling is set. This bug appeared in iOS Safari 13.4.1 and was not present on 13.3.1. 1657103 1 webkit-bug-importer 2020-05-28 17:30:52 -0700 <rdar://problem/63739559> 1660237 2 jack.palmer 2020-06-08 09:13:14 -0700 +1 I've also noticed the issue where horizontal scrolling does not occur when I do not have a touchmove handler and I change the visibility of my element from "hidden" to "visible". This becomes more problematic when needing to use "visibility: hidden" to ensure screen readers and other assistive technology do not see the element, and then setting the element to "visibility: visible" when a user should be able to interact with it (eg. hiding the scrollable element inside of a collapsable menu). Are there any known work around for this until it is fixed? 1660257 3 simon.fraser 2020-06-08 10:38:50 -0700 In your testcase, I see that the second scrollable doesn't get momentum, which explains why a vertical movement in it scrolls the page. I think that's a bug. The third scrollable always behaves as expected. I'm testing iOS 13.5 on iPad. 1660265 4 simon.fraser 2020-06-08 11:04:01 -0700 I also see some issues on macOS. Will investigate. 1660287 5 simon.fraser 2020-06-08 11:55:45 -0700 I think the bug is that creating composited overflow depends on m_hasCompositedScrollableOverflow, but nothing updates that when visibility is toggled (computeScrollDimensions() only happens on layout). 1660288 6 simon.fraser 2020-06-08 11:57:46 -0700 And canUseCompositedScrolling() explicitly checks visibility. 1660443 7 401387 simon.fraser 2020-06-08 15:53:14 -0700 Created attachment 401387 Patch 1660580 8 ews-feeder 2020-06-08 22:29:26 -0700 Committed r262774: <https://trac.webkit.org/changeset/262774> All reviewed patches have been landed. Closing bug and clearing flags on attachment 401387. 400388 2020-05-27 15:23:12 -0700 2020-05-27 15:23:12 -0700 minimal test case scrolling-safari-13.4.1.html text/html 1232 cesium PCFkb2N0eXBlIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPG1ldGEgbmFtZT0idmlld3BvcnQi IGNvbnRlbnQ9IndpZHRoPWRldmljZS13aWR0aCI+CiAgICA8c2NyaXB0PgogICAgICBkb2N1bWVu dC5kb2N1bWVudEVsZW1lbnQuYWRkRXZlbnRMaXN0ZW5lcigndG91Y2htb3ZlJywgKCkgPT4ge30p OwogICAgPC9zY3JpcHQ+CiAgICA8c3R5bGU+CiAgICAgICNoaWRkZW4xIHsKICAgICAgICBvdmVy ZmxvdzogYXV0bzsKICAgICAgfQoKICAgICAgI2hpZGRlbjIgewogICAgICAgIG92ZXJmbG93OiBh dXRvOwogICAgICAgIHZpc2liaWxpdHk6IGhpZGRlbjsKICAgICAgICBwb3NpdGlvbjogcmVsYXRp dmU7CiAgICAgIH0KCiAgICAgICNoaWRkZW4zIHsKICAgICAgICBvdmVyZmxvdzogYXV0bzsKICAg ICAgICB2aXNpYmlsaXR5OiBoaWRkZW47CiAgICAgICAgLXdlYmtpdC1vdmVyZmxvdy1zY3JvbGxp bmc6IHRvdWNoOwogICAgICB9CgogICAgICAuc2Nyb2xsYWJsZSB7CiAgICAgICAgcGFkZGluZzog MTB2aDsKICAgICAgICB3aWR0aDogMjAwdnc7CiAgICAgICAgd29yZC1zcGFjaW5nOiAzMHZ3Owog 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