140535 2015-01-15 20:23:11 -0800 Border-radius clip of non-stacking composited descendant doesn't work 2022-08-31 14:40:14 -0700 1 1 1 Unclassified WebKit Compositing 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 68196 https://bugs.webkit.org/show_bug.cgi?id=216978 https://bugs.webkit.org/show_bug.cgi?id=230636 https://bugs.webkit.org/show_bug.cgi?id=231360 https://bugs.webkit.org/show_bug.cgi?id=238983 https://bugs.webkit.org/show_bug.cgi?id=67950 https://bugs.webkit.org/show_bug.cgi?id=244337 BrowserCompat, InRadar P2 Normal --- 1 simon.fraser simon.fraser bicknellr kandalkar.abhijeet58 karlcow simon.fraser sun.shin thorton timdream webkit-bug-importer oldest_to_newest 1061758 0 244746 simon.fraser 2015-01-15 20:23:11 -0800 Created attachment 244746 Testcase Attached testcase shows a big blue rectangle on Mac; it should get radius clipping. 1061776 1 simon.fraser 2015-01-15 22:03:52 -0800 I have a fix for this. 1061782 2 simon.fraser 2015-01-15 22:17:44 -0800 Actually I take that back. This is the non-stacking context case, where we use m_ancestorClippingLayer, which is going to also need a mask equivalent. 1062397 3 sun.shin 2015-01-19 10:37:36 -0800 I guess it is came from the Container didn’t participate in overlap detection, so it couldn't clip child layer since later painting order of graphics layer. 1211156 4 283687 bicknellr 2016-07-14 14:48:28 -0700 Created attachment 283687 extra examples w/ exaggerated offsets I found something recently that seems very closely related to this bug: composited descendants are positioned slightly differently than their ancestors. If the ancestor has a non-integer top or left (either set directly or during an animation) the descendant is sometimes positioned up or left by one *device* pixel. Maybe composited elements are aligned with floor and non-composited with normal rounding? In the attached page, the examples labeled "scale3d transform" show both this bug and the positioning thing I mentioned. However, the two cases at the bottom might go against my float vs. normal rounding possibility: If top / left of the parent are integers but a transform applied to it translates it by some non-integer amount, then there isn't any noticeable difference in the positions of the parent and child. If the top / left of the parent are *not* integers, then you can still see the slight offset of the parent and child - even with a zero translate3d transform applied to the parent. Also, if you zoom the page, you'll notice the offsets change but are never larger than one device pixel. 1211177 5 simon.fraser 2016-07-14 15:27:47 -0700 Please file that issue in a new bug. 1211225 6 bicknellr 2016-07-14 16:36:02 -0700 Filed as 159794. 1681419 7 webkit-bug-importer 2020-08-19 11:22:18 -0700 <rdar://problem/67414831> 1796161 8 simon.fraser 2021-09-22 12:05:51 -0700 *** Bug 216065 has been marked as a duplicate of this bug. *** 1895280 9 simon.fraser 2022-08-31 14:40:14 -0700 *** This bug has been marked as a duplicate of bug 68196 *** 244746 2015-01-15 20:23:11 -0800 2015-01-15 20:23:11 -0800 Testcase radius-clip-descendants.html text/html 566 simon.fraser PCFET0NUWVBFIGh0bWw+Cgo8aHRtbD4KPGhlYWQ+CiAgICA8c3R5bGU+CiAgICAgICAgLmNvbnRh aW5lciB7CiAgICAgICAgICAgIHdpZHRoOiA0MDBweDsKICAgICAgICAgICAgaGVpZ2h0OiAzMDBw eDsKICAgICAgICAgICAgYm9yZGVyOiAycHggc29saWQgYmxhY2s7CiAgICAgICAgICAgIGJvcmRl ci1yYWRpdXM6IDMwJTsKICAgICAgICAgICAgb3ZlcmZsb3c6IGhpZGRlbjsKICAgICAgICB9CiAg 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