[Webkit-unassigned] [Bug 205603] New: Scrollbar is hidden on mobile when using e.preventDefault() in touch event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205603

            Bug ID: 205603
           Summary: Scrollbar is hidden on mobile when using
                    e.preventDefault() in touch event
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gambard at chromium.org

Created attachment 386435

  --> https://bugs.webkit.org/attachment.cgi?id=386435&action=review

Example test case

Steps to reproduce the problem:
1. Access the HTML file attached
2. Scroll down a bit 
3. You'll see how the page scrolls down automatically fired by JS but the scrollbar is not visible while doing so.

What is the expected behavior?
The scrollbar should always be visible no matter how the movement gets fired. No matter if it is a user input or if it is fired by the code.

What went wrong?
The scrollbar is not visible while the page gets scrolled.

Reported originally at crbug.com/985801

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