98825 2012-10-09 15:07:55 -0700 Adjusting CSS left property on element with border-radius leaves repaint trail 2014-04-29 06:18:40 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Mac OS X 10.8 RESOLVED INVALID P2 Normal --- 1 dbates webkit-unassigned eric hyatt jamesr j.b.gray mitz mjs simon.fraser oldest_to_newest 738233 0 167856 dbates 2012-10-09 15:07:55 -0700 Created attachment 167856 Example Using Safari Mac Nightly r130772 with Safari version Version 6.0.1 (8536.26.14) on Mac Adjusting the CSS left property of an element with a non-zero border-radius may leave a noticeable repaint trail. You can observe this issue by using the attached example, example.html, and performing the following steps: 1. Open example.html. 2. Click the blue square 10 times. Notice that the left edge of the blue square is painted multiple times from the left edge of the window to its current position. Once you become familiar with the issue you may find that you can reproduce it by clicking the blue square less than 10 times. For completeness, I was able to reproduce this issue with Mac Nightly r130772 and Safari version 6.0.1 (8536.26.14) on Mac OS 10.8.2. 738237 1 167858 dbates 2012-10-09 15:15:33 -0700 Created attachment 167858 Screenshot of repaint trail A screenshot of the repaint trail produced using the instructions in the bug description. 738242 2 dbates 2012-10-09 15:16:33 -0700 (In reply to comment #0) > Using Safari Mac Nightly r130772 with Safari version Version 6.0.1 (8536.26.14) on Mac Adjusting the CSS left property of an element with a non-zero border-radius may leave a noticeable repaint trail. I meant to write: Adjusting the CSS left property of an element with a non-zero border-radius may leave a noticeable repaint trail. 738281 3 dbates 2012-10-09 15:52:48 -0700 You can also observe this repaint trail in Paul Irish's requestAnimationFrame() example, <http://jsfiddle.net/paul/rjbGw/3/> (used to derive the attached example.html). This JSFiddle example is referenced from <http://paulirish.com/2011/requestanimationframe-for-smart-animating/>. 739239 4 mitz 2012-10-10 13:07:48 -0700 Does this reproduce if you disable full-screen accelerated drawing (using Safari’s Debug menu) and open a new window? 740024 5 dbates 2012-10-11 09:07:25 -0700 (In reply to comment #4) > Does this reproduce if you disable full-screen accelerated drawing (using Safari’s Debug menu) and open a new window? No, this issue doesn't reproduce when I disable full page accelerated drawing. 740030 6 mitz 2012-10-11 09:12:36 -0700 Thanks for confirming that. This is an issue in Quartz which is being tracked by Apple, and not something to be addressed in WebKit, so closing as Invalid per our convention. 1004924 7 j.b.gray 2014-04-29 06:18:40 -0700 A little late, but for anyone who still has issues with this behaviour I've come up with a couple of workarounds: 1. Add a very faint box shadow (e.g. "box-shadow: 0 0 1px rgba(0, 0, 0, 0.05)") to the element, increasing the dimensions of the damage rect to include the stray antialiased pixels. This is the simplest and least problematic method, IMO. 2. Use the old translateZ hack ("-webkit-transform: translateZ(0)") so that the element is rendered as a separate compositing layer. Less recommended, has implications for performance. 167856 2012-10-09 15:07:55 -0700 2012-10-09 15:07:55 -0700 Example example.html text/html 851 dbates PCFET0NUWVBFIGh0bWw+CjxodG1sPgo8aGVhZD4KPHN0eWxlPgojc3F1YXJlIHsKICAgIC13ZWJr aXQtdXNlci1zZWxlY3Q6IG5vbmU7CiAgICBiYWNrZ3JvdW5kOiBibHVlOwogICAgY29sb3I6IHdo aXRlOwogICAgaGVpZ2h0OiAyNTZweDsKICAgIGxlZnQ6IDBweDsKICAgIHBhZGRpbmctbGVmdDog MTBweDsKICAgIHBvc2l0aW9uOiBhYnNvbHV0ZTsKICAgIHdpZHRoOiAyNTZweDsKCiAgICAvKiBX aGVuIGJvcmRlci1yYWRpdXMgaXMgMCBvciBvbWl0dGVkIHRoZW4gY2xpY2tpbmcgb24gdGhlIHNx dWFyZSBkb2Vzbid0CiAgICBwcm9kdWNlIGEgcGFpbnQgdHJhaWwuIE5vdGljZSB0aGF0IHZhcnlp bmcgdGhpcyB2YWx1ZSB3aWxsIG1ha2UgdGhlIHBhaW50CiAgICB0cmFpbCBtb3JlIG9yIGxlc3Mg bm90aWNlYWJsZS4gVXNpbmcgU2FmYXJpIFZlcnNpb24gNi4wLjEgKDg1MzYuMjYuMTQsIHIxMzA3 NzIpLAogICAgYSAyMHB4IGJvcmRlci1yYWRpdXMgcHJvZHVjZXMgYSBsZXNzIG5vdGljZWFibGUg cGFpbnQgdHJhaWwgdGhhbiBhIDEwcHgKICAgIGJvcmRlciByYWRpdXMuICovCiAgICBib3JkZXIt cmFkaXVzOiAxMHB4Owp9Cjwvc3R5bGU+CjwvaGVhZD4KPGJvZHk+CjxkaXYgaWQ9InNxdWFyZSI+ 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