156435 2016-04-09 09:05:52 -0700 composited scrolling interferes with the propagation of perspective 2020-05-14 12:46:28 -0700 1 1 1 Unclassified WebKit Compositing Safari 9 iPhone / iPad Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=211916 InRadar P2 Normal --- 1 vollick simon.fraser aghassemi+bugzilla ajuma changseok esprehn+autocc ews-watchlist fred.wang glenn koivisto kondapallykalyan me pdr simon.fraser webkit-bug-importer oldest_to_newest 1182450 0 vollick 2016-04-09 09:05:52 -0700 Try visiting https://output.jsbin.com/muqaqejafi Clicking the button toggles -webkit-overflow-scrolling : touch/auto. When touch is selected, perspective from the scroller is not applied to the background as per my understanding of the TR transform spec and parallax fails. This appears to be the source of some pain in the wild (https://css-tricks.com/forums/topic/parallax-scrolling-that-actually-works-on-ipad/). I'm not aware of a way to get both fling and parallax on an overflow scroller on iOS without resorting to JS (is there a way?). Unrelated: it is difficult to click the button on iOS without being scrolled to the top. Could the scrolled content be interfering with hit testing, despite the scroll clip? 1182468 1 webkit-bug-importer 2016-04-09 11:03:23 -0700 <rdar://problem/25642222> 1585201 2 me 2019-10-29 18:08:58 -0700 Related: https://bugs.webkit.org/show_bug.cgi?id=164949 1585206 3 simon.fraser 2019-10-29 18:25:27 -0700 *** Bug 164949 has been marked as a duplicate of this bug. *** 1652287 4 simon.fraser 2020-05-13 11:04:42 -0700 *** Bug 211851 has been marked as a duplicate of this bug. *** 1652293 5 399281 simon.fraser 2020-05-13 11:14:49 -0700 Created attachment 399281 Patch 1652298 6 399281 koivisto 2020-05-13 11:21:43 -0700 Comment on attachment 399281 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=399281&action=review > Source/WebCore/rendering/RenderLayerBacking.cpp:691 > + auto layerForChildrenTransform = [&]() { Unnecessary () > Source/WebCore/rendering/RenderLayerBacking.cpp:706 > + perspectiveRelativeBox = borderBoxRect; > + return m_graphicsLayer.get(); > + }; > + > + auto* layerForPerspective = layerForChildrenTransform(); If you wanted to be fancy you could return both perspectiveRelativeBox and layer together with something like return std::make_tuple(m_graphicsLayer.get(), borderBoxRect); } auto [layerForPerspective, perspectiveRelativeBox] = layerForChildrenTransform() 1652316 7 simon.fraser 2020-05-13 12:01:26 -0700 https://trac.webkit.org/changeset/261632/webkit 399281 2020-05-13 11:14:49 -0700 2020-05-13 11:21:43 -0700 Patch bug-156435-20200513111448.patch text/plain 12530 simon.fraser U3VidmVyc2lvbiBSZXZpc2lvbjogMjYxNjIwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMTE4MzE5YmM3Y2EyNjUw MmRjMTMzNDhjNDI2OTYwOGE5ZWJiNDFlOS4uNjg1NWQyNjM3ZDdlN2MzNzJhMzQyODU1NGFiMDMy ODljNmE2MGExYyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI2IEBACisyMDIwLTA1LTEzICBTaW1v biBGcmFzZXIgIDxzaW1vbi5mcmFzZXJAYXBwbGUuY29tPgorCisgICAgICAgIGNvbXBvc2l0ZWQg 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