224282 2021-04-07 08:36:26 -0700 Pages with nested HTML elements having display: flex and height: 100% freeze on Safari 2021-04-07 13:33:46 -0700 1 1 1 Unclassified WebKit Layout and Rendering Safari 14 Mac (Intel) macOS 10.15 NEW InRadar P2 Major --- 1 kapeels42 webkit-unassigned bfulgham koivisto simon.fraser smoley svillar turboki webkit-bug-importer zalan oldest_to_newest 1747894 0 425399 kapeels42 2021-04-07 08:36:26 -0700 Created attachment 425399 Page to reproduce the problem Steps to Reproduce: 1. Open attached flex.html in Safari (also available at https://kapeels.github.io/nested-layouts/flex.html) Safari fails to open the page. Chromium (v91.0.4441.0) and Firefox (v86.0) are able to render the page instantly. Safari v14.0.3 (15610.4.3.1.7, 15610) and Safari Technology Preview 123 have the same behavior. This problem is easy to run into when custom elements that use flex layouts and height: 100% in their shadow roots around <slot /> elements are nested. https://bugs.webkit.org/show_bug.cgi?id=222202 seems related but the fix does not appear to address this issue in Safari Technology Preview 123. 1747993 1 smoley 2021-04-07 11:47:00 -0700 Thanks for filing, I'm able to reproduce this issue on Safari 13 as well as TOT. 1747994 2 webkit-bug-importer 2021-04-07 11:47:09 -0700 <rdar://problem/76358367> 1748047 3 turboki 2021-04-07 13:33:46 -0700 FYI, this same issue is present with using Grid layouts. Check this out: https://kapeels.github.io/nested-layouts/playground.html You can nest 100s of flex or grid layouts without an issue, but setting height:100% and Im seeing perf degredatations at around 7 levels of nesting for Grid. 425399 2021-04-07 08:36:26 -0700 2021-04-07 08:36:26 -0700 Page to reproduce the problem flex.html text/html 12557 kapeels42 PCFET0NUWVBFIGh0bWw+CjxodG1sPgogIDxoZWFkPgogICAgPG1ldGEgY2hhcnNldD0idXRmLTgi IC8+CiAgICA8dGl0bGU+TmVzdGVkIGZsZXggbGF5b3V0IHByb2JsZW08L3RpdGxlPgogICAgPHN0 eWxlIHR5cGU9InRleHQvY3NzIj4KICAgICAgLmxheW91dCB7CiAgICAgICAgZGlzcGxheTogZmxl eDsKICAgICAgICBoZWlnaHQ6IDEwMCU7CiAgICAgIH0KICAgCiAgICA8L3N0eWxlPgogIDwvaGVh ZD4KICA8Ym9keT4KICAgIDxkaXYgaWQ9InN0YWdlIiBjbGFzcz0iZmxleCI+CiAgICAgIDxkaXYg Y2xhc3M9ImxheW91dCI+CiAgICAgICAgPGRpdiBjbGFzcz0ibGF5b3V0LWl0ZW0iPgogICAgICAg ICAgPGRpdiBjbGFzcz0ibGF5b3V0Ij4KICAgICAgICAgICAgPGRpdiBjbGFzcz0ibGF5b3V0LWl0 ZW0iPgogICAgICAgICAgICAgIDxkaXYgY2xhc3M9ImxheW91dCI+CiAgICAgICAgICAgICAgICA8 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