215719 2020-08-20 17:21:33 -0700 Facebook post with lots of comments has cut off scrollbar, and can't scroll fully to the bottom (sticky) 2020-08-25 19:22:50 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 zalan zalan bfulgham changseok esprehn+autocc ews-watchlist glenn kondapallykalyan pdr simon.fraser svillar zalan oldest_to_newest 1681873 0 zalan 2020-08-20 17:21:33 -0700 1. On Facebook, find an image post with lots of comments 2. Click on the image to make it fullscreen, with the comments in a sidebar 3. Scroll the comments 1681874 1 zalan 2020-08-20 17:21:49 -0700 <rdar://problem/66411757> 1681878 2 406982 zalan 2020-08-20 17:23:48 -0700 Created attachment 406982 test reduction It looks like flex layout ignores "position: sticky" content when computing the layout overflow. Works fine when the content is relatively positioned. 1681879 3 zalan 2020-08-20 17:24:09 -0700 This looks to be fixed in Chrome. 1681880 4 406983 zalan 2020-08-20 17:26:07 -0700 Created attachment 406983 test reduction 1681915 5 zalan 2020-08-20 19:08:15 -0700 with position: sticky B---YGL- --* RenderView at (0,0) size 2302x1252 renderer->(0x141981240) B-----L- -- HTML RenderBlock at (0,0) size 2302x1252 renderer->(0x1419816f0) node->(0x141981540) B------- -- BODY RenderBody at (8,8) size 2286x1236 renderer->(0x141981820) node->(0x141981660) B--O--L- -- DIV RenderBlock at (0,0) size 2286x500 renderer->(0x141982d60) node->(0x1419829a0) (layout overflow 0,0 2271x600) B------- -- DIV RenderFlexibleBox at (0,0) size 2271x300 renderer->(0x141983ad0) node->(0x141983710) (layout overflow 0,0 2271x600) (visual overflow 0,0 2271x600) B------- -- DIV RenderBlock at (0,0) size 100x300 renderer->(0x141983c70) node->(0x1419837a0) (layout overflow 0,0 100x600) (visual overflow 0,0 100x600) B------- -- DIV RenderBlock at (0,0) size 100x600 renderer->(0x141983da0) node->(0x141983890) BK----L- -- DIV RenderBlock at (0,275) size 100x210 renderer->(0x141983ed0) node->(0x141983980) with position: relative B---YGL- --* RenderView at (0,0) size 2302x1252 renderer->(0x141981240) B-----L- -- HTML RenderBlock at (0,0) size 2302x1252 renderer->(0x1419816f0) node->(0x141981540) B------- -- BODY RenderBody at (8,8) size 2286x1236 renderer->(0x141981820) node->(0x141981660) B--O--L- -- DIV RenderBlock at (0,0) size 2286x500 renderer->(0x141982d60) node->(0x1419829a0) (layout overflow 0,0 2271x810) B------- -- DIV RenderFlexibleBox at (0,0) size 2271x300 renderer->(0x141983ad0) node->(0x141983710) (layout overflow 0,0 2271x810) (visual overflow 0,0 2271x600) B------- -- DIV RenderBlock at (0,0) size 100x300 renderer->(0x141983c70) node->(0x1419837a0) (layout overflow 0,0 100x810) (visual overflow 0,0 100x600) B------- -- DIV RenderBlock at (0,0) size 100x600 renderer->(0x141983da0) node->(0x141983890) BR----L- -- DIV RenderBlock at (0,600) size 100x210 renderer->(0x141983ed0) node->(0x141983980) scrolling overflow is 600px vs 810px (where the sticky box height is 210px). 1681918 6 zalan 2020-08-20 19:46:39 -0700 The sticky box, due to its vertical position (at 275px) does not contribute to the scrolling overflow, while the relatively positioned box(at 600px) does. 1682760 7 zalan 2020-08-25 13:01:24 -0700 Actually it fails even with no flex item. 1682781 8 zalan 2020-08-25 13:47:26 -0700 fails: fixed 'height: 300px;' -> incorrect scrollable overflow. (B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout B---YGL- --* RenderView at (0,0) size 2302x1252 renderer->(0x1465f9240) B-----L- -- HTML RenderBlock at (0,0) size 2302x1252 renderer->(0x1465f96f0) node->(0x1465fb920) B------- -- BODY RenderBody at (8,8) size 2286x1236 renderer->(0x1465f9820) node->(0x1465fbb00) B--O--L- -- DIV RenderBlock at (0,0) size 2286x504 renderer->(0x1465faca0) node->(0x1465fab50) (layout overflow 2,2 2267x610) B------- -- DIV RenderBlock at (2,2) size 2267x300 renderer->(0x14772c1b0) node->(0x1465fbb90) (layout overflow 0,0 2267x610) (visual overflow 0,0 2267x610) B------- -- DIV RenderBlock at (0,0) size 100x610 renderer->(0x14772c2e0) node->(0x1465fbc20) BK----L- -- DIV RenderBlock at (0,500) size 100x110 renderer->(0x14772c410) node->(0x1465fbcb0) works: fixed 'height: 300px;' -> child 'height: auto' -> used height 720px; -> correct delegated scrollable overflow. (B)lock/(I)nline/I(N)line-block, (A)bsolute/Fi(X)ed/(R)elative/Stic(K)y, (F)loating, (O)verflow clip, Anon(Y)mous, (G)enerated, has(L)ayer, (C)omposited, (+)Dirty style, (+)Dirty layout B---YGL- --* RenderView at (0,0) size 2302x1252 renderer->(0x1465f9240) B-----L- -- HTML RenderBlock at (0,0) size 2302x1252 renderer->(0x1465f96f0) node->(0x1465fb920) B------- -- BODY RenderBody at (8,8) size 2286x1236 renderer->(0x1465f9820) node->(0x1465fbb00) B--O--L- -- DIV RenderBlock at (0,0) size 2286x504 renderer->(0x1465faca0) node->(0x1465fab50) (layout overflow 2,2 2267x720) B------- -- DIV RenderBlock at (2,2) size 2267x300 renderer->(0x14772c1b0) node->(0x1465fbb90) (layout overflow 0,0 2267x720) (visual overflow 0,0 2267x720) B------- -- DIV RenderBlock at (0,0) size 2267x720 renderer->(0x14772c2e0) node->(0x1465fbc20) B------- -- DIV RenderBlock at (0,0) size 100x610 renderer->(0x14772c410) node->(0x1465fbcb0) BK----L- -- DIV RenderBlock at (0,375) size 100x110 renderer->(0x14772d660) node->(0x1465fbda0) 1682816 9 zalan 2020-08-25 15:00:36 -0700 It looks like we use the sticky position in RenderBox::layoutOverflowRectForPropagation() to compute the overflow (as if it was relative positioned with something like "height: 100px; bottom: 100px;") 1682842 10 407247 zalan 2020-08-25 16:36:37 -0700 Created attachment 407247 Patch 1682881 11 ews-feeder 2020-08-25 19:22:49 -0700 Committed r266156: <https://trac.webkit.org/changeset/266156> All reviewed patches have been landed. Closing bug and clearing flags on attachment 407247. 406982 2020-08-20 17:23:48 -0700 2020-08-20 17:26:07 -0700 test reduction sticky-reduction.html text/html 627 zalan PHN0eWxlPgouY29udGFpbmVyIHsKICBoZWlnaHQ6IDUwMHB4OwogIG92ZXJmbG93OiBzY3JvbGw7 CiAgYm9yZGVyOiAycHggc29saWQgYmxhY2s7Cn0KCi5mbGV4IHsKICBkaXNwbGF5OmZsZXg7CiAg aGVpZ2h0OiAzMDBweDsKICBiYWNrZ3JvdW5kLWNvbG9yOiBjeWFuOwp9Cgouc2Nyb2xseSB7CiAg bWFyZ2luLWxlZnQ6IDMwcHg7CiAgd2lkdGg6IDEwMHB4OwogIGhlaWdodDogNjAwcHg7CiAgYmFj a2dyb3VuZC1jb2xvcjogcmVkOwogIGJvcmRlci1ib3R0b206IDEwcHggc29saWQgZ3JlZW47Cn0K Ci5zdGlja3l7CiAgYm90dG9tOiAwOwogIHBvc2l0aW9uOiBzdGlja3k7CiAgd2lkdGg6IDEwMHB4 OwogIGhlaWdodDogMTAwcHg7CiAgYmFja2dyb3VuZC1jb2xvcjogYmx1ZTsKfQoKPC9zdHlsZT4K PHByZT5QQVNTIGlmIHlvdSBzZWUgdGhlIGdyZWVuIGJvcmRlciBhdCB0aGUgYm90dG9tIG9mIHRo ZSByZWQgYm94IHdoZW4gc2Nyb2xsZWQgYWxsIHRoZSB3YXkgZG93bi48L3ByZT4KPGRpdiBjbGFz cz1jb250YWluZXI+CjxkaXYgY2xhc3M9ZmxleD4KICA8ZGl2PgogICAgPGRpdiBjbGFzcz1zY3Jv 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