126267 2013-12-27 15:21:31 -0800 Root background doesn't correctly update with composited <html> element 2023-02-24 09:32:23 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) All All RESOLVED CONFIGURATION CHANGED InRadar P2 Normal --- 1 geoff.benson webkit-unassigned ahmad.saleem792 simon.fraser thorton webkit-bug-importer oldest_to_newest 963140 0 geoff.benson 2013-12-27 15:21:31 -0800 This bug is best seen with a minimal demonstration page, which I have attached. How to reproduce: * Apply this style declaration: html { -webkit-backface-visibility: hidden; } * After the page has loaded, change the styling on the <body> tag dynamically via JavaScript, for example by setting the background-color to something new. Expected behavior: The body style should be applied, and the viewport should redraw to show the applied style. Actual behavior: Only portions of the page get updated. This bug was found when researching why only parts of the screen were rendered with a new background image when a style was applied to <body> (the parts of the screen which didn't get new elements added remained black, per the <body>'s previous style at the time.) Additional: If the time between initial render and when the <body> style is changed is small enough (1ms or less), the bug doesn't trigger. This has been reproduced on the following environments: MacOS: Safari 7.0.1, Chrome 31.0.1650.63, Opera Next 19.0.1326.21 Windows 7: Chrome 31.0.1650.63 m Android: 4.3, 4.0, 2.3.5 (though 2.3.5 has additional rendering bugs related to this). iOS: 7.0.4 Workaround: If the -webkit-backface-visibility style is applied to <body> instead of <html>, this bug is not triggered. 963141 1 220066 geoff.benson 2013-12-27 15:22:10 -0800 Created attachment 220066 Example test case which triggers the bug 963893 2 webkit-bug-importer 2014-01-02 14:34:49 -0800 <rdar://problem/15740636> 1936553 3 ahmad.saleem792 2023-02-24 09:32:23 -0800 I am not able to reproduce this bug in Safari 16.3 & STP164 and we are matching with Chrome Canary 112 and Firefox Nightly 112 as well in the attached testcase. Marking this as "RESOLVED CONFIGURATION CHANGED". Thanks! Please reopen if this is reproducible. Thanks! 220066 2013-12-27 15:22:10 -0800 2013-12-27 15:22:10 -0800 Example test case which triggers the bug index.html text/html 1321 geoff.benson PCFET0NUWVBFIGh0bWw+CjxodG1sPgogICAgPGhlYWQ+CiAgICAgICAgPHN0eWxlIHR5cGU9InRl eHQvY3NzIj4KICAgICAgICAgICAgaHRtbCB7CiAgICAgICAgICAgICAgICAtd2Via2l0LWJhY2tm YWNlLXZpc2liaWxpdHk6IGhpZGRlbjsKICAgICAgICAgICAgfQoKICAgICAgICAgICAgLmJvZHlf YnVnX2RlbW9uc3RyYXRpb24gewogICAgICAgICAgICAgICAgYmFja2dyb3VuZC1jb2xvcjogYmxh Y2s7CiAgICAgICAgICAgICAgICBjb2xvcjogd2hpdGU7CiAgICAgICAgICAgIH0KICAgICAgICA8 L3N0eWxlPgogICAgICAgIDxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2NyaXB0Ij4KICAgICAgICAg ICAgc2V0VGltZW91dCggZnVuY3Rpb24oKSB7CiAgICAgICAgICAgICAgICAidXNlIHN0cmljdCI7 CiAgICAgICAgICAgICAgICBkb2N1bWVudC5nZXRFbGVtZW50c0J5VGFnTmFtZSgiYm9keSIpWzBd LmNsYXNzTmFtZSA9ICJib2R5X2J1Z19kZW1vbnN0cmF0aW9uIjsKICAgICAgICAgICAgfSwgMjAw MCk7CiAgICAgICAgPC9zY3JpcHQ+CiAgICA8L2hlYWQ+CiAgICA8Ym9keT4KICAgICAgICA8ZGl2 PgogICAgICAgICAgICA8cD4KICAgICAgICAgICAgICAgIEluIDIgc2Vjb25kcywgdGhlIGJhY2tn cm91bmQgb2YgdGhlIGJvZHkgaXMgc3VwcG9zZWQgdG8gYmVjb21lIGJsYWNrLgogICAgICAgICAg ICAgICAgSG93ZXZlciwgdGhlIHJlbmRlcmluZyBidWcgYmVpbmcgZGVtb25zdHJhdGVkIGNhdXNl cyBvbmx5IHRoaXMgZGl2IHRvIGJlY29tZSBibGFjay4KICAgICAgICAgICAgPC9wPgogICAgICAg ICAgICA8cD4KICAgICAgICAgICAgICAgIE9uY2UgdGhlIGJ1ZyBoYXMgdHJpZ2dlcmVkLCB0cnkg cmVzaXppbmcgdGhlIHdpbmRvdy4gIFRoaXMgYXBwZWFycyB0byB0cmlnZ2VyIGEKICAgICAgICAg ICAgICAgIHJlZHJhdywgYWZ0ZXIgd2hpY2ggdGhlIGV4cGVjdGVkIHJlc3VsdCBpcyBzZWVuLgog ICAgICAgICAgICA8L3A+CiAgICAgICAgICAgIDxwPgogICAgICAgICAgICAgICAgSW4gcHJhY3Rp Y2UsIHRoaXMgbGVhZHMgdG8gc2l0dWF0aW9ucyB3aGVyZSBiaWcgY2h1bmtzIG9mIHRoZSBzY3Jl ZW4gbWF5IG5vdCBiZQogICAgICAgICAgICAgICAgcHJvcGVybHkgcmVkcmF3bi4KICAgICAgICAg ICAgPC9wPgogICAgICAgICAgICA8cD4KICAgICAgICAgICAgICAgIEludGVyZXN0aW5nbHksIGlm IHRoZSB0aW1lb3V0IGlzIHJlZHVjZWQgZnJvbSAyMDAwbXMgdG8gMW1zLCB0aGUgcGFnZSByZW5k ZXJzIGNvcnJlY3RseS4KICAgICAgICAgICAgPC9wPgogICAgICAgIDwvZGl2PgogICAgPC9ib2R5 Pgo8L2h0bWw+Cg==