Bug 239014

Summary: [Pointer events] pointerend/pointercancel event never fired when swiping to forwards a page
Product: WebKit Reporter: pfg.webkit
Component: UI EventsAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: h.dodov, pfg.webkit, thorton, webkit-bug-importer, wenson_hsieh
Priority: P2 Keywords: InRadar
Version: Safari 15   
Hardware: iPhone / iPad   
OS: iOS 15   
Attachments:
Description Flags
Pointer swipe bug demo none

pfg.webkit
Reported 2022-04-08 13:27:08 PDT
Reproduction: 1. Open this url: https://patrickhlauke.github.io/touch/gesture-touch/pointerevents.html 2. Navigate to any other url 3. Go back 4. Start swiping from the right edge of the screen to go forwards a page 5. Move your finger back to the right edge of the screen to cancel that 6. Notice that a pointerend/pointercancel event is never fired I would expect a pointercancel event to be fired as soon as the page starts moving for the back/forwards animation, or at least when the finger is lifted, but one is never fired at all causing pages to get stuck expecting more events that never come.
Attachments
Pointer swipe bug demo (12.65 MB, video/mov)
2022-04-16 03:26 PDT, Hristiyan Dodov 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2022-04-15 13:28:13 PDT
<rdar://problem/91825957>
Hristiyan Dodov
Comment 2 2022-04-16 03:26:09 PDT
Created attachment 457745 [details] Pointer swipe bug demo
Hristiyan Dodov
Comment 3 2022-04-16 03:36:40 PDT
I can reproduce this issue on iPhone 12 mini, OS version 15.4.1. Reproduction site: https://safari-pointer-swipe-bug.netlify.app/ I've also attached a video that showcases the bug: - Swiping from the left (go to previous page) correctly triggers `pointerdown`, then `pointerup` events. - Swiping from the right (go to next page) correctly triggers `pointerdown`, but **incorrectly** does not trigger `pointerup` afterwards. The OP expects `pointercancel` to be fired, but that would introduce an inconsistency with swiping from the left. It should be a `pointerup` event.
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