148384 2015-08-24 11:57:06 -0700 Wheel events stop propagating when target element is removed from DOM 2015-08-25 11:03:12 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 bfulgham bfulgham bfulgham cmarcelo commit-queue esprehn+autocc kangil.han oldest_to_newest 1120332 0 bfulgham 2015-08-24 11:57:06 -0700 When listening to the ‘wheel’ or ‘mousewheel’ event on the document, if the event’s original target element is removed from the DOM the wheel event is no longer dispatched. 1. Add a listener for ‘wheel’ on the document that removes the target of the event from the DOM. Have this happen after the element moves a specific amount or a certain number of events is received. 2. Scroll on the page (over the relevant element) 3. Keep scrolling You will observe that the DOM event is no longer dispatched. 1120333 1 bfulgham 2015-08-24 11:57:48 -0700 <rdar://problem/19732211> 1120338 2 259762 bfulgham 2015-08-24 12:01:31 -0700 Created attachment 259762 Patch 1120341 3 259762 thorton 2015-08-24 12:08:02 -0700 Comment on attachment 259762 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=259762&action=review > Source/WebCore/page/mac/EventHandlerMac.mm:919 > + return false; Frames can be removed... > Source/WebCore/page/mac/EventHandlerMac.mm:922 > + return true; Anonymous nodes can't be scrollable? (probably true) > Source/WebCore/page/mac/EventHandlerMac.mm:925 > + return true; What if a node is moved around in the DOM? (removed and reinserted before we get here) Is that OK? 1120365 4 259762 bfulgham 2015-08-24 14:00:15 -0700 Comment on attachment 259762 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=259762&action=review >> Source/WebCore/page/mac/EventHandlerMac.mm:925 >> + return true; > > What if a node is moved around in the DOM? (removed and reinserted before we get here) Is that OK? It does seem like it would be a problem if we removed a node from one scrolling container, and inserted it into a new location. In that case, even with this code, we would start our event handling with this "migrated" node. Maybe it would be better to just break the caching state in Element::removedFrom. 1120432 5 259786 bfulgham 2015-08-24 15:46:01 -0700 Created attachment 259786 Patch 1120474 6 259797 bfulgham 2015-08-24 17:35:06 -0700 Created attachment 259797 Patch 1120634 7 259797 hyatt 2015-08-25 10:54:02 -0700 Comment on attachment 259797 Patch r=me 1120646 8 bfulgham 2015-08-25 11:03:12 -0700 Committed r188920: <http://trac.webkit.org/changeset/188920> 259762 2015-08-24 12:01:31 -0700 2015-08-24 15:45:59 -0700 Patch bug-148384-20150824120122.patch text/plain 2599 bfulgham SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE4ODg3NCkKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDIyIEBACisyMDE1LTA4LTI0ICBCcmVudCBG dWxnaGFtICA8YmZ1bGdoYW1AYXBwbGUuY29tPgorCisgICAgICAgIFdoZWVsIGV2ZW50cyBzdG9w 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