61174 2011-05-20 01:32:37 -0700 REGRESSION (r81992): Element position doesn't update sometimes when style.left/top and style.webkitTransform set 2011-05-20 10:16:52 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified NEW Regression P1 Normal --- 1 jamesr webkit-unassigned hyatt mitz simon.fraser oldest_to_newest 406940 0 jamesr 2011-05-20 01:32:37 -0700 See testcase. The issue seems to be that if style.left is set to a new value and style.webkitTransform is set to the same value it previously had ("scale(1" in this case), its layout does not update. This caused some animation code we had to appear very jerky as sometimes the elements would stay stuck for many frames at a time. 406941 1 94189 jamesr 2011-05-20 01:34:29 -0700 Created attachment 94189 test case In this test case, the top and bottom blocks always have the same specified style.left value. The top block has its webkitTransform set to a scale on each tick such that it receives the same scale() value for 4 frames in a row and a very slightly different value for 1 frame, repeating. 407129 2 mitz 2011-05-20 08:54:06 -0700 Is this the same as bug 60689? 407172 3 simon.fraser 2011-05-20 10:16:52 -0700 Looks like it. 94189 2011-05-20 01:34:29 -0700 2011-05-20 01:34:29 -0700 test case bug61174.html text/html 892 jamesr PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImVuIj4KPHN0eWxlPgppbWcgewogIGJvcmRlcjog MDsKfQoKLmJsb2NrIHsKICBoZWlnaHQ6IDUwcHg7CiAgcG9zaXRpb246IGFic29sdXRlOwogIHdp ZHRoOiA1MHB4OwogIGJhY2tncm91bmQtY29sb3I6IGJsdWU7Cn0KCiN0b3BCbG9jayB7CiAgdG9w OiA1MHB4Owp9CgojYm90QmxvY2sgewogIHRvcDogMTAwcHg7Cn0KPC9zdHlsZT4KCiAgPGRpdiBj bGFzcz0iYmxvY2siIGlkPSJ0b3BCbG9jayI+CiAgPC9kaXY+CiAgPGRpdiBjbGFzcz0iYmxvY2si IGlkPSJib3RCbG9jayI+CiAgPC9kaXY+CjxzY3JpcHQ+CgpmdW5jdGlvbiBzZXRUcmFuc2Zvcm0o dHJhbnNmb3JtSXRlbSwgdHJhbnNmb3JtYXRpb24pIHsKICAgIHRyYW5zZm9ybUl0ZW0uc3R5bGVb Jy13ZWJraXQtdHJhbnNmb3JtJ10gPSB0cmFuc2Zvcm1hdGlvbjsKfQoKdmFyIGZyYW1lQ291bnQg PSAwOwpmdW5jdGlvbiB0aWNrKCkgewogICAgaWYgKGZyYW1lQ291bnQgPT0gMTAwKQogICAgICAg IGZyYW1lQ291bnQgPSAwOwogICAgdG9wQmxvY2suc3R5bGUud2Via2l0VHJhbnNmb3JtID0gInNj YWxlKCIgKyAoMSArIChmcmFtZUNvdW50ICUgNSA9PSAxID8gMC4wMDAwMSA6IDApICsgIikiKTsK ICAgIHRvcEJsb2NrLnN0eWxlLmxlZnQgPSAoNSAqIGZyYW1lQ291bnQpICsgInB4IjsKICAgIGJv dEJsb2NrLnN0eWxlLmxlZnQgPSAoNSAqIGZyYW1lQ291bnQpICsgInB4IjsKICAgICsrZnJhbWVD b3VudDsKICAgIHNldFRpbWVvdXQodGljaywgNTApOwp9CnRvcEJsb2NrID0gZG9jdW1lbnQuZ2V0 RWxlbWVudEJ5SWQoJ3RvcEJsb2NrJyk7CmJvdEJsb2NrID0gZG9jdW1lbnQuZ2V0RWxlbWVudEJ5 SWQoJ2JvdEJsb2NrJyk7Cgp0aWNrKCk7IAoKPC9zY3JpcHQ+Cg==