Bug 158276

Summary:	Tapping from one <input> to another in an overlay can cause shaking/jiggling effect
Product:	WebKit	Reporter:	Chris Rebert <webkit>
Component:	Layout and Rendering	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	dino, enrica, john, jyeo098, kranthipolimera1910, simon.fraser, thorton, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 9
Hardware:	iPhone / iPad
OS:	iOS 10
URL:	http://output.jsbin.com/xedane/quiet
Bug Depends on:
Bug Blocks:	159753

Description Chris Rebert 2016-06-01 14:36:28 PDT

Steps to reproduce:
1. Open http://output.jsbin.com/xedane/quiet in Safari on iOS 9.3.2.
2. Tap the "Launch modal" button.
3. Scroll down to "field 7".
4. Tap into the <input> below "field 7".
5. Tap into the <input> above it.

Actual result:
While focusing the <input>, the modal moves up and down multiple times, causing an unsightly jiggling/shaking/jerky effect

Expected result:
When focusing the <input>, the modal should move smoothly, preferably in a single motion.

Original Bootstrap bug report:
https://github.com/twbs/bootstrap/issues/19927

Comment 1 Radar WebKit Bug Importer 2016-06-06 10:49:42 PDT

<rdar://problem/26652754>

Comment 2 kranthi polimera 2017-04-17 03:47:45 PDT

Is there  any solution for this Jerking effect on tap of input field on modal

Comment 3 Simon Fraser (smfr) 2017-04-17 04:53:31 PDT

Do you still see the problem in iOS 10.3?

Comment 4 Chris Rebert 2017-04-18 00:27:07 PDT

Unable to reproduce in iOS 10.3.1
Good work WebKit Team!

Comment 5 kranthi polimera 2017-04-18 02:54:17 PDT

Unable to reproduce in iOS 10.3.1
Thanks and good work team