UNCONFIRMED 81040
mousewheel event wheelDeltaY data shows anomalies and jitter 
https://bugs.webkit.org/show_bug.cgi?id=81040
Summary mousewheel event wheelDeltaY data shows anomalies and jitter
Jason San Jose
Reported 2012-03-13 15:02:11 PDT
Steps to reproduce: 0. Requires a Mac with OSX 10.7 Lion for smooth trackpad scrolling (via laptop trackpad or external mouse/trackpad) 1. Download project from github (https://github.com/njx/mousewheel-test) or see attached zip 2. Open mousewheel-test.html 3. Follow instructions to perform a medium to large scroll 4. Observe output graph The graph shows wheelDeltaY values for the duration of the "mousewheel". The attached sample graph shows large anomalies during acceleration and jittering towards the end of deceleration.
Attachments
Graph of mousewheel event wheelDeltaY on a MacBook Air running 10.7.3 Lion (56.98 KB, image/jpeg)
2012-03-13 15:03 PDT, Jason San Jose 		no flags
Details
Archive of test project from https://github.com/njx/mousewheel-test (34.23 KB, application/zip)
2012-03-13 15:03 PDT, Jason San Jose 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Jason San Jose
Comment 1 2012-03-13 15:03:05 PDT
Created attachment 131718 [details] Graph of mousewheel event wheelDeltaY on a MacBook Air running 10.7.3 Lion
Jason San Jose
Comment 2 2012-03-13 15:03:49 PDT
Created attachment 131720 [details] Archive of test project from https://github.com/njx/mousewheel-test
Alexey Proskuryakov
Comment 3 2012-03-13 16:54:03 PDT
Are you seeing this with Safari 5.1.3?
Jason San Jose
Comment 4 2012-03-13 16:56:39 PDT
Yes. Tested with Safari 5.1.4, Chrome 17.0.963.79 and Webkit nightly r110587.
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