149035 2015-09-10 05:49:10 -0700 'relative' positioned child element not cleared completely if parent's style.display is set to 'none' 2025-11-30 16:23:15 -0800 1 1 1 Unclassified WebKit Layout and Rendering WebKit Local Build PC Linux RESOLVED CONFIGURATION CHANGED P2 Normal --- 1 g.ludwikowsk webkit-unassigned ahmad.saleem792 bfulgham g.ludwikowsk karlcow simon.fraser zalan oldest_to_newest 1124882 0 260919 g.ludwikowsk 2015-09-10 05:49:10 -0700 Created attachment 260919 Minimal testcase for reproduction. Reproduction: see minimal_testcase_webkit.html, click 'NEW' button. It sets 'NEW' button parent div's 'style.display' to none, but some part of the 'NEW' button isn't repainted/cleared. If 'BACK' button is pressed, the 'NEW' button is correctly repainted/shown back to screen. From my analysis I've found out that for the 'NEW' button, during clearing it from screen, its repaint/dirty rectangle doesn't include an offset from being below '.somespace' div. Yet during painting it back, its repaint rectangle is calculated correctly, and includes the offset (200px). I've tried to find the reason for this difference. Render tree during removing '.somespace' div from screen lacks one anonymous RenderBox, which is present during layouting the div back to screen (as RenderButton parent). Processing this RenderBox in RenderBox.cpp:2233 (computeRectForRepaint(...) - "topLeft.move(locationOffset);") adds mentioned offset. This anonymous RenderBox is removed from the render tree in RenderBlock.cpp:752 (removeChild(...) - "collapseAnonymousBoxChild(*this, downcast<RenderBlock>(child));") earlier in repainting, during processing '.somespace' div's rendertree node. There is a test, which decides whether it is safe to collapseAnonymousBoxChild, but it evaluates to true. If I skip the call to collapseAnonymousBoxChild in a debugger, the button is cleared correctly. 'NEW' button is cleared correctly on Firefox and Chromium. Tested on WebKit MiniBrowserEFL @r189566 on Linux. 1124883 1 260920 g.ludwikowsk 2015-09-10 05:55:34 -0700 Created attachment 260920 Screenshot before clicking 'NEW' button 1124884 2 260921 g.ludwikowsk 2015-09-10 05:57:06 -0700 Created attachment 260921 Screenshot after clicking 'NEW' button, part of the 'NEW' button not cleared from screen 1124885 3 260922 g.ludwikowsk 2015-09-10 06:02:45 -0700 Created attachment 260922 Screenshot, rendered correctly of Firefox 1919868 4 ahmad.saleem792 2022-12-16 02:51:30 -0800 I am able to reproduce this bug in Safari Technology Preview 160, it seems to be painting or invalidation issue where when clicking "Next", it does show both "Back" and "Next" but if I move to different tab or resize then "Next" go away. It works perfectly fine on first try in Chrome Canary 110 and Firefox Nightly 110. Just wanted to share updated testing result. Thanks! 2161944 5 ahmad.saleem792 2025-11-29 14:53:29 -0800 I am not able to reproduce this on Safari 26.2 Beta. @Karl - can you confirm please? 2162041 6 karlcow 2025-11-30 16:23:03 -0800 This is now working the same in Safari, Firefox, Chrome. The new button is cleared, the blue rectangle disappears, and a back green button appears. 260919 2015-09-10 05:49:10 -0700 2015-09-10 05:49:10 -0700 Minimal testcase for reproduction. minimal_testcase_webkit.html text/html 1205 g.ludwikowsk PCFET0NUWVBFIGh0bWw+CjxodG1sPgoJPGhlYWQ+CiAgICA8dGl0bGU+cmVuZGVyaW5nIHRlc3Q8 L3RpdGxlPgogICAgPHN0eWxlIHR5cGU9InRleHQvY3NzIj4KICAgICogewogICAgICAgIGJvcmRl cjogMHB4OwogICAgICAgIG1hcmdpbjogMHB4OwogICAgfQogICAgYnV0dG9uIHsKICAgICAgICB3 aWR0aDogMTQwcHg7CiAgICAgICAgaGVpZ2h0OiA3MHB4OwogICAgICAgIGJhY2tncm91bmQtY29s b3I6IGdyZWVuOwogICAgICAgIGNvbG9yOiB3aGl0ZTsKICAgIH0KICAgIC5zb21lc3BhY2Ugewog ICAgICAgIHdpZHRoOiAxMDAlOwogICAgICAgIGhlaWdodDogMjAwcHg7CiAgICAgICAgYmFja2dy b3VuZC1jb2xvcjogY3lhbjsKICAgIH0KICAgIC5uZXdidXR0b24gewogICAgICAgIHBvc2l0aW9u OiByZWxhdGl2ZTsKICAgICAgICB0b3A6IDYwcHg7CiAgICB9CiAgICA8L3N0eWxlPgogICAgICAg IAogICAgPHNjcmlwdD4KICAgIGZ1bmN0aW9uIGJ1dHRvbl8xX2NsaWNrKCkgewogICAgICAgIHZh 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