145407 2015-05-27 07:10:35 -0700 JavaScript WebKitCSSMatrix 'rotate' method on iOS generates matrix different than the method in other OS 2015-08-29 11:56:45 -0700 1 1 1 Unclassified WebKit JavaScriptCore 525.x (Safari 3.2) iPhone / iPad iOS 8.4 RESOLVED WORKSFORME InRadar P2 Normal --- 1 damianstefaniak1987 webkit-unassigned benjamin damianstefaniak1987 dino jonlee simon.fraser webkit-bug-importer oldest_to_newest 1097629 0 damianstefaniak1987 2015-05-27 07:10:35 -0700 stackoverflow: http://stackoverflow.com/questions/30454078/webkitcssmatrix-rotate-method-on-ios-safari-chrome-and-other-browsers-genera js fiddle testbed: http://jsfiddle.net/DamianS1987/c5c0r4y6/18/ The above js fiddle testbed using WebKitCSSMatrix constructor and 'rotate' method generates following strings: -iOS (8.3) ipadMini (Safari,Chrome) or ipad 3 retina iOS (8.3) matrix(0, 0.258819, 0, 0.965926, 0, 0); -Mac Yosemite, Win8.1, Android (any browser) matrix(0.965926, 0.258819, -0.258819, 0.965926, 0, 0); Now most major devices work well. However, ipad (tested on two different devices) generates matrix with 'a' and 'd' values equal to 0 - transform: matrix(a, c, b, d, tx, ty). 1097630 1 damianstefaniak1987 2015-05-27 07:13:46 -0700 'Platform' dropdown - there was no 'iOS 8.3' option available to select. Hence, 8.2 selected. 1098083 2 simon.fraser 2015-05-28 23:09:15 -0700 Possibly a bug in the ARM assembly used for TransformationMatrix multiply. 1098099 3 damianstefaniak1987 2015-05-29 01:09:56 -0700 Please let me know if you need any more details about the issue from the devices. 1121685 4 damianstefaniak1987 2015-08-28 08:03:31 -0700 I just updated my iPadMini to iSO 8.4.1 and after checking the testbed I can still recreate the issue. Do we know if this issue is going to be fixed? 1121692 5 webkit-bug-importer 2015-08-28 08:16:19 -0700 <rdar://problem/22475169> 1121906 6 benjamin 2015-08-28 18:19:20 -0700 I tried the jsfiddle on an iPad 3rd gen with iOS 9 and I cannot reproduce the issue. I checked the Matrix multiply assembly and I don't see anything weird with it. LLVM is unfortunately unrolling the loop but the register are preserved. Can you please try iOS 9? 1121998 7 damianstefaniak1987 2015-08-29 11:56:45 -0700 Yes, that's right. I can confirm that after updating ipad mini to iOS 9 beta the issue can't be recreated. It seems to be fixed. Thanks for that update.