Bug 199172 – [iOS 13] Regression: Rubberband effect at the bottom stutters

• Component: Scrolling
• Status: RESOLVED CONFIGURATION CHANGED

[Mehmet]

IOS 13 Official Beta - Safari for iPhone

Steps to reproduce: 

1.) Run Safari for iPhone on IOS 13 Official Beta
2.) Open a long page
3.) Scroll down to the end/bottom of the page until you receive a rubberband effect
4.) Do immediately a further swipe so that the toolbar at the bottom appear and the page receives a further rubberband effect.

Actual: The toolbar at the buttom appears but the rubberband effect of the page stutters. 

Expected: The toolbar should appear and the page should have a smooth rubberband effect.

This is a regression of a regression which was fixed again in iOS 11.1 with issue 149280 and <rdar://problem/22758169>. It is still working fine with Safari on IOS 12.3. But now again broken in iOS 13 :(

If you have any question, please let me know.

Thanks in advance.
Mehmet

[Radar WebKit Bug Importer]

<rdar://problem/52217684>

[Alexey Proskuryakov]

Could you please provide some example URLs?

[Mehmet]

(In reply to Alexey Proskuryakov from comment #2)
> Could you please provide some example URLs?

Thanks for your feedback. It happens on every website, which has vertical scrollbars. 

E.g. https://webkit.org/

When you scroll to the end of the page, the bottom toolbar appears, but the page doesn‘t has rubberband effect then. You can compare with Safari on iOS 12, where it works perfectly. 

I can record a screencast if you want, but I can provide it earliest on Monday, since I have no iOS 13 device in my hands over the weekend. 

Thanks.

[Mehmet]

Created attachment 377824 [details]
iOS13 with the bug.

In addition to my comment 3, please find attached the screencasts.

Safari in iOS13 with the bug and Safari in iOS12 without the bug.

If you need more information, please let me know.

Thanks.

[Mehmet]

Created attachment 377825 [details]
iOS12 without the bug.

[Mehmet]

This is fixed in iOS 13.1 Public Beta 2.

Thanks :)