Bug 149895 - Kinetic scrolling breaks on Mac when using 100% height, box-sizing: border-box with top and bottom borders
Summary: Kinetic scrolling breaks on Mac when using 100% height, box-sizing: border-bo...
Status: NEW
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: WebKit Nightly Build
Hardware: Mac OS X 10.11
: P2 Normal
Assignee: Nobody
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-10-07 13:55 PDT by Jonathan Wells
Modified: 2015-10-07 14:48 PDT (History)
6 users (show)

See Also:

Attachments
Scrolling: Reduced test case. (3.54 KB, text/html)
2015-10-07 13:55 PDT, Jonathan Wells 		no flags Details
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Description Jonathan Wells 2015-10-07 13:55:57 PDT 
Created attachment 262637 [details]
Scrolling: Reduced test case.

In Mac OS X (possibly also iOS) scrolling an item with 100% height, box-sizing set to border-box and pixel values for top and bottom borders, the kinetic scrolling will not reach the bottom if the trackpad is, say, flicked hard with two fingers from the top and left to scroll under its own momentum. The scrolling will stop shy of the bottom by the same as the border height. To reach the bottom the fingers need to still be touching the trackpad. It seems like a more linear scrolling animation kicks in by mistake. Reduced test case attached.
Comment 1 Simon Fraser (smfr) 2015-10-07 14:30:49 PDT 
I can reproduce.