bouncing content when doing kinetic scrolling behind display region

Originator:max.desyatov
Number:rdar://10965239 Date Originated:01-Mar-2012 11:07 PM
Status:Closed Resolved:23-Apr-2012 09:46 PM
Product:Safari Product Version:5.2
Classification:UI/Usability Reproducible:Always
 
Summary: When doing a kinetic scrolling behind a displayed content on a tab you'll see that content is bouncing in an ugly way.  It is inconsistent with overall kinetic scrolling behavior. Also you can see beautiful and smooth kinetic scrolling in competing products (e.g. Google Chrome).

Steps to Reproduce: Open any site and scroll to top or to bottom several times.  You can see this bug reproduced on the attached video.

Expected Results: Smooth scrolling is expected.

Actual Results: Bouncing and stuttering scrolling is seen.

Regression: This is definitely a regression from Safari 5.1 as I can't reproduce it there.

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