[Webkit-unassigned] [Bug 185614] New: Mobile Safari: Momentum scrolling stops working for a couple of seconds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185614

            Bug ID: 185614
           Summary: Mobile Safari: Momentum scrolling stops working for a
                    couple of seconds
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andre.koenig at gmail.com

Scrolling an area with activated momentum scrolling (-webkit-overflow-scrolling: touch) AND "deactivated rubberband" leads to a scenario in which the scrolling is blocked for a couple of seconds.

I created a demo for that case: https://codesandbox.io/s/134y68k187

The important parts are:

*html* element:

```
html {
  ...
  overflow: hidden;
  position: fixed;
  overscroll-behavior-y: none;
  ...
}

```

The actual "content" element with the scrollable list:

```
  align-self: stretch;
  background: rgba(0, 0, 0, 0.01);
  flex: 1 1 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
```

Unfortunately, the scrolling stops working when accidentally start the scrolling interaction on the header and moving the finger to the list. When doing that, the respective list with cards is not scrollable anymore.

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