[Webkit-unassigned] [Bug 199947] New: AX: Scrollbar is hidden on mobile when using e.preventDefault() in touchMove event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199947

            Bug ID: 199947
           Summary: AX: Scrollbar is hidden on mobile when using
                    e.preventDefault() in touchMove event
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: atrigol at gmail.com

Created attachment 374469

  --> https://bugs.webkit.org/attachment.cgi?id=374469&action=review

Scrollbar is hidden on mobile when using e.preventDefault() in touchMove event

When the page scroll gets fired from JS by using a touchmove event and using e.preventDefault() inside it, then the page scrolls as normally but the scroll bar is not visible during the process.
This way the user doesn't have a way to know in which part of the page is or get a real felling of scrolling the page.

Steps to reproduce:

- Open the file I attach in Safari or Chrome for iOS
- Tap and swipe down a bit
- You'll see how the page scrolls down fired by JS but the scrollbar is not visible.

This didn't happen in past versions of Safari or Chrome for iOS.

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