63331 2011-06-24 10:19:35 -0700 [Async overflow scrolling] Incorrect clipping of fixed element inside overflow element with compositing 2022-07-14 19:35:50 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified NEW https://bugs.webkit.org/show_bug.cgi?id=242673 InRadar P2 Normal --- 1 simon.fraser webkit-unassigned abucur dino fujii koivisto simon.fraser tonikitoo vangelis webkit-bug-importer oldest_to_newest 426946 0 98505 simon.fraser 2011-06-24 10:19:35 -0700 Created attachment 98505 Testcase Testcase shows incorrect clipping of fixed element inside overflow:scroll element when compositing is enabled. The fixed element should not be clipped. 426985 1 simon.fraser 2011-06-24 10:59:18 -0700 The assumption that if an element with z-index has overflow, all its children are clipped by that overflow is false for fixed position elements. 461311 2 simon.fraser 2011-09-02 10:40:55 -0700 This is tricky. Overflow get special treatment for positioned elements. I'm going to have to put them outside the clipping layer, and give each their own clipping layer or something. 606773 3 138136 dino 2012-04-20 11:57:11 -0700 Created attachment 138136 Another testcase 606775 4 dino 2012-04-20 11:58:29 -0700 *** Bug 83190 has been marked as a duplicate of this bug. *** 882772 5 simon.fraser 2013-04-29 14:48:59 -0700 *** Bug 115377 has been marked as a duplicate of this bug. *** 882776 6 webkit-bug-importer 2013-04-29 14:51:36 -0700 <rdar://problem/13766693> 1639902 7 simon.fraser 2020-04-09 15:03:32 -0700 *** Bug 196145 has been marked as a duplicate of this bug. *** 1883950 8 138136 fujii 2022-07-14 19:16:24 -0700 Comment on attachment 138136 Another testcase The latest Safari has no problem for this test case. It seems another problem already fixed. 1883951 9 fujii 2022-07-14 19:18:00 -0700 STP 148 still has this issue. Disabling Async Overflow Scrolling Internal Feature setting of MiniBrowser can work around the issue. 98505 2011-06-24 10:19:35 -0700 2011-06-24 10:19:35 -0700 Testcase fixed-inside-overflow-scroll.html text/html 1319 simon.fraser PCFET0NUWVBFIGh0bWw+Cgo8aHRtbD4KPGhlYWQ+CiAgPHN0eWxlPgogICAgYm9keSB7CiAgICAg IG1hcmdpbjogMDsKICAgICAgaGVpZ2h0OiAxMjAwcHg7CiAgICB9CgogICAgLnNjcm9sbGluZyB7 CiAgICAgIG1hcmdpbjogNjBweDsKICAgICAgYm9yZGVyOiA1cHggc29saWQgYmxhY2s7CiAgICAg IHdpZHRoOiAzMDBweDsKICAgICAgaGVpZ2h0OiA0MDBweDsKICAgICAgb3ZlcmZsb3c6IHNjcm9s bDsKICAgICAgcGFkZGluZzogMjBweDsKICAgICAgcG9zaXRpb246IHJlbGF0aXZlOwogICAgICB6 LWluZGV4OiAwOwogICAgfQogICAgCiAgICAuY29udGVudHMgewogICAgICB3aWR0aDogMTAwJTsK ICAgICAgaGVpZ2h0OiAxMDAwcHg7CiAgICB9CiAgICAKICAgIC5maXhlZCB7CiAgICAgIHBvc2l0 aW9uOiBmaXhlZDsKICAgICAgYmFja2dyb3VuZC1jb2xvcjogZ3JlZW47CiAgICAgIG1hcmdpbi10 b3A6IDEwMHB4OwogICAgICBoZWlnaHQ6IDEwMHB4OwogICAgICB3aWR0aDogMzAwcHg7CiAgICAg IC13ZWJraXQtdHJhbnNmb3JtOiB0cmFuc2xhdGVaKDApOwogICAgfQogICAgCiAgICAjaW5kaWNh dG9yIHsKICAgICAgcG9zaXRpb246IGFic29sdXRlOwogICAgICBiYWNrZ3JvdW5kLWNvbG9yOiBy ZWQ7CiAgICAgIGxlZnQ6IDg1cHg7CiAgICAgIHRvcDogMTg1cHg7CiAgICAgIGhlaWdodDogMTAw cHg7CiAgICAgIHdpZHRoOiAzMDBweDsKICAgIH0KICA8L3N0eWxlPgogIDxzY3JpcHQ+CgogIGZ1 bmN0aW9uIHRlc3RTY3JvbGxMaXN0ZW5lcigpCiAgewogICAgdmFyIHNjcm9sbGVyID0gZG9jdW1l bnQuZ2V0RWxlbWVudEJ5SWQoJ3Njcm9sbGVyJyk7CiAgICBzY3JvbGxlci5zY3JvbGxUb3AgPSAy MDsKICAgIAogICAgd2luZG93LnNjcm9sbFRvKDAsIDUwKTsKICB9CgogIGZ1bmN0aW9uIG9uUGFn ZUxvYWQoKQogIHsKICAgICAgdGVzdFNjcm9sbExpc3RlbmVyKCk7CiAgICAgIHdpbmRvdy5zZXRU aW1lb3V0KGZ1bmN0aW9uKCkgewogICAgICAgIAogICAgICB9LCAxMCk7IC8vIFNjcm9sbCBldmVu dHMgYXJlIGFzeW5jLgogIH07CgogIHdpbmRvdy5hZGRFdmVudExpc3RlbmVyKCdsb2FkJywgb25Q YWdlTG9hZCwgZmFsc2UpOwogIDwvc2NyaXB0Pgo8L2hlYWQ+Cjxib2R5PgoKICA8ZGl2IGlkPSJp bmRpY2F0b3IiPjwvZGl2PgoKICA8ZGl2IGlkPSJzY3JvbGxlciIgY2xhc3M9InNjcm9sbGluZyI+ CiAgICA8ZGl2IGNsYXNzPSJjb250ZW50cyI+CiAgICAgIDxkaXYgY2xhc3M9ImZpeGVkIj4KICAg ICAgICBJIGFtIGZpeGVkCiAgICAgIDwvZGl2PgogICAgPC9kaXY+CiAgPC9kaXY+CjwvYm9keT4K PC9odG1sPgo= 138136 2012-04-20 11:57:11 -0700 2022-07-14 19:16:24 -0700 Another testcase 83190-reduction.html text/html 705 dino PHN0eWxlPgouc2hhcmVkIHsKICAvKiBjaGFuZ2UgdGhlc2UgdHdvIHZhbHVlcyB0byBzb21ldGhp bmcgPiAxNTAgdG8gc2VlIGNvcnJlY3QgcmVzdWx0ICovCiAgdG9wOiA2MHB4OwogIGxlZnQ6IDYw cHg7Cn0KCi5vdXRlciB7CiAgb3ZlcmZsb3c6IGhpZGRlbjsKICB6LWluZGV4OiAxOwogIHBvc2l0 aW9uOiBmaXhlZDsKICB3aWR0aDogMzAwcHg7CiAgaGVpZ2h0OiAxMDBweDsKICBib3JkZXI6IDEw cHggc29saWQgZ3JlZW47Cn0KCi5pbm5lciB7CiAgYmFja2dyb3VuZC1jb2xvcjogd2hpdGU7CiAg Ym9yZGVyOiAxMHB4IHNvbGlkIHJlZDsKICBwb3NpdGlvbjogZml4ZWQ7CiAgd2lkdGg6IDQwMHB4 OwogIGhlaWdodDogMzAwcHg7CiAgdG9wOiAxMDBweDsKICBsZWZ0OiAxMDBweDsKfQoKLmNvbXBv c2l0ZSB7CiAgcG9zaXRpb246IGFic29sdXRlOwogIHRvcDogMTBweDsKICBsZWZ0OiAxMHB4Owog IHdpZHRoOiAxMDBweDsKICBoZWlnaHQ6IDEwMHB4OwogIGJhY2tncm91bmQ6ICNhYWFhZmY7CiAg LXdlYmtpdC10cmFuc2Zvcm06IHRyYW5zbGF0ZVooMCk7Cn0KPC9zdHlsZT4KPGRpdiBjbGFzcz0i Y29tcG9zaXRlIj48L2Rpdj4KCjxkaXYgY2xhc3M9Im91dGVyIHNoYXJlZCI+CiAgPGRpdiBjbGFz cz0iaW5uZXIgc2hhcmVkIj5zaG91bGQgc2VlIGFsbCB0aGUgdGV4dCBhbmQgZm91ciBzaWRlcyBv ZiBib3JkZXI8L2Rpdj4KPC9kaXY+