[Webkit-unassigned] [Bug 172875] New: [iOS] -webkit-overflow-scrolling: touch causes content to disappear

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172875

            Bug ID: 172875
           Summary: [iOS] -webkit-overflow-scrolling: touch causes content
                    to disappear
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: iOS 10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrew.holloway at untropy.net
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

I've created a minimal example to demonstrate this issue, located here: 

https://jsfiddle.net/booc0mtaco/kyekqjrL/

STEPS to reproduce:

1) open the linked JSFiddle and view the content in MobileSafari
2) click on the header "click to reveal"
3) note that content is visible
4) attempt to scroll to the right

**Expected behavior: the content will scroll smoothly, making use of the prefixed tag for smooth scrolling.

**Actual behavior: the container will vanish.

They are still in the DOM , and in the right locations. Closing and reopening the section also restores them to visible until the next scroll is made.

Removing the prefixed property `-webkit-overflow-scrolling` fixes the behavior, but makes the scroll work as it used to and becomes sticky. Also, removing some of the other properties will fix the symptoms intermittently.

In most cases, triggering any DOM change or style change adjacent to the vanished element will trigger a repaint, and the content will become visible.

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