170280 2017-03-30 04:18:25 -0700 Dynamically added position:fixed element is in the wrong place 2017-05-02 23:08:23 -0700 1 1 1 Unclassified WebKit CSS Safari 10 iPhone / iPad iOS 10 RESOLVED FIXED InRadar P2 Normal --- 1 wart.claes simon.fraser glads.logs0o simon.fraser thorton wart.claes webkit-bug-importer zalan oldest_to_newest 1292763 0 wart.claes 2017-03-30 04:18:25 -0700 On a page with a fixed positioned element in WKWebView renders the element on the wrong place. This occurs when the element is shown after a user interaction. The element is positioned lower then it should be. This only happens on iOS 10.3 (Safari 10.1). The bug was tested on iPhone 5s and iPhone 7. Link to the github repository https://github.com/WartClaes/ios10.3-bug/tree/master with a simple test case. Link to the demo page http://trbo.be/ios/ # Steps to reproduce 1. On initial load, scroll down so the button is in the middle of the screen 2. Click the button 3. The fixed header is now shown somewhere on the page, but not in it’s intended position 4. If you want to select the text “header”, you can notice that the actual element is still on top where it should be, it is just painted in the wrong place 1293204 1 ap 2017-03-31 11:04:25 -0700 <rdar://problems/31374008> 1298226 2 wart.claes 2017-04-18 01:54:27 -0700 Is there any more information about this one? 1303439 3 simon.fraser 2017-05-01 15:25:44 -0700 Seems similar to bug 171413: both use nested position fixed. It's pretty odd that you're making <body> position:fixed with a negative top here. 1303467 4 308781 simon.fraser 2017-05-01 15:56:07 -0700 Created attachment 308781 Simple testcase 1303581 5 simon.fraser 2017-05-01 22:03:30 -0700 This only happens with UI-side compositing, and reproduces on Mac too in that configuration. What's happening is this: The <header> initially is the only fixed element. Its GraphicsLayer gets a position of 0,10. When you scroll, the scrolling tree calls GraphicsLayerCA::syncPosition() which sets various new positions to make fixed position work. However, these positions don't get into PlatformCALayerRemote (they don't need to). When the body becomes fixed, <header> is now parented in another fixed element, so we stop tracking it in the scrolling tree. When we do layout for this change, <header>'s GraphicsLayer gets a setPosition({0, 10}) which is pushed to PlatformCALayerRemote during the flush, but PlatformCALayerRemote doesn't see this as a change (it still has {0,10}) so this change doesn't make it to the UI process, and the UI layer remains with its old scroll-influenced offset. 1303806 6 simon.fraser 2017-05-02 14:11:03 -0700 This also only happens if you have margin:0 on the body. 1303840 7 308857 simon.fraser 2017-05-02 15:21:33 -0700 Created attachment 308857 Patch 1303857 8 308857 thorton 2017-05-02 15:45:35 -0700 Comment on attachment 308857 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=308857&action=review > Source/WebKit2/ChangeLog:9 > + Layers for position:fixed elements are have their positions reconciled after scrolls are have their? 1303867 9 simon.fraser 2017-05-02 16:01:04 -0700 *** Bug 171413 has been marked as a duplicate of this bug. *** 1303872 10 simon.fraser 2017-05-02 16:08:27 -0700 https://trac.webkit.org/r216104 1303963 11 wart.claes 2017-05-02 23:08:18 -0700 thanks Simon and Tim! 1303964 12 wart.claes 2017-05-02 23:08:23 -0700 thanks Simon and Tim! 308781 2017-05-01 15:56:07 -0700 2017-05-01 15:56:07 -0700 Simple testcase nested-dynamic-fixed.html text/html 2114 simon.fraser PCFET0NUWVBFIGh0bWw+CjxodG1sPgogICAgPGhlYWQ+CiAgICAgICAgPG1ldGEgbmFtZT0idmll d3BvcnQiIGNvbnRlbnQ9IndpZHRoPWRldmljZS13aWR0aCwgaW5pdGlhbC1zY2FsZT0xIj4KICAg ICAgICAKICAgICAgICA8c3R5bGU+CiAgICAgICAgICAgIGJvZHkgewogICAgICAgICAgICAgICAg bWFyZ2luOiAwOyAvKiBUaGlzIHNlZW1zIHRvIGJlIHJlcXVpcmVkIHRvIHJlcHJvZHVjZSAqLwog ICAgICAgICAgICAgICAgaGVpZ2h0OiAyMDAwcHg7CiAgICAgICAgICAgIH0KCiAgICAgICAgICAg IC5mcm96ZW4gewogICAgICAgICAgICAgICAgcG9zaXRpb246IGZpeGVkOwogICAgICAgICAgICB9 CgogICAgICAgICAgICBoZWFkZXIgewogICAgICAgICAgICAgICAgcG9zaXRpb246IGZpeGVkOwog ICAgICAgICAgICAgICAgbGVmdDogMDsKICAgICAgICAgICAgICAgIHJpZ2h0OiAwOwogICAgICAg ICAgICAgICAgdG9wOiAwOwogICAgICAgICAgICAgICAgaGVpZ2h0OiA1MHB4OwogICAgICAgICAg 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