137915 2014-10-21 03:28:50 -0700 Overflowing scroll problems when CSS perspective is active in HTML tag 2015-04-08 11:10:54 -0700 1 1 1 Unclassified WebKit CSS 528+ (Nightly build) Mac (Intel) OS X 10.9 NEW P2 Normal --- 1 swat_marc webkit-unassigned djmadeira oldest_to_newest 1043149 0 240195 swat_marc 2014-10-21 03:28:50 -0700 Created attachment 240195 Bug sample WebKit 7.1 (9537.85.10.17.1, r174761) Safari 7.1: FAIL Firefox 36a: OK Opera 25: FAIL What steps will reproduce the problem? 1. In the CSS, set html tag has a property -webkit-perspective:1. 2. In the CSS, you create a navigation drawer by making nav element to be position:fixed, top:0, bottom:0, overflow:auto. 3. In the HTML, create enough navigation and content items to make them overflow. What is the expected result? It should be possible to scroll up to the latest item in both content and navigation drawer. What happens instead of that? It's impossible to reach the latest item in the navigation drawer. Instead, the navigation drawer bottom property is dismissed (?) and its height is set to the total height of the HTML element. 1083663 1 djmadeira 2015-04-08 11:10:54 -0700 I can confirm seeing this same bug in Chrome Canary & Safari. It seems to be related to the height of absolute & fixed position elements being calculated differently on perspective vs. not parents; see demo: http://codepen.io/djmadeira/pen/JoqgGE The perspective child has the height of its parent, even though the parent doesn't have position: relative, but the other div correctly gets it's height from the root. I should note that I see the same behavior in Firefox; maybe this is intentional, just arcane? 240195 2014-10-21 03:28:50 -0700 2014-10-21 03:28:50 -0700 Bug sample overflow.html text/html 11244 swat_marc PCFET0NUWVBFIGh0bWw+CjxodG1sIGNsYXNzPSJuby1qcyI+Cgk8aGVhZD4KCQk8bWV0YSBjaGFy c2V0PSJ1dGYtOCI+CgkJPG1ldGEgaHR0cC1lcXVpdj0iWC1VQS1Db21wYXRpYmxlIiBjb250ZW50 PSJJRT1lZGdlIj4KCQk8dGl0bGU+PC90aXRsZT4KCQk8bWV0YSBuYW1lPSJkZXNjcmlwdGlvbiIg Y29udGVudD0iIj4KCQk8bWV0YSBuYW1lPSJ2aWV3cG9ydCIgY29udGVudD0id2lkdGg9ZGV2aWNl LXdpZHRoLCBpbml0aWFsLXNjYWxlPTEiPgoKPHN0eWxlIHR5cGU9InRleHQvY3NzIiBtZWRpYT0i c2NyZWVuIj4KCmh0bWwgewogIC13ZWJraXQtcGVyc3BlY3RpdmU6IDEwOwogIC1tb3otcGVyc3Bl Y3RpdmU6IDEwOwogIHBlcnNwZWN0aXZlOiAxMDsKfQoKaHRtbCxib2R5IHsKICBtYXJnaW46IDA7 IHBhZGRpbmc6IDA7Cn0KCm5hdiB7CiAgcG9zaXRpb246IGZpeGVkOwogIGJhY2tncm91bmQ6IGFs aWNlYmx1ZTsKICB0b3A6IDA7CiAgYm90dG9tOiAwOwogIHBhZGRpbmc6IDEwcHg7CiAgbWFyZ2lu OiAwOwogIG92ZXJmbG93OiBhdXRvOwp9Cgo8L3N0eWxlPgoKCTwvaGVhZD4KCTxib2R5Pgo8bmF2 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