[Webkit-unassigned] [Bug 150974] New: Dynamic content in '-webkit-scrolling-touch' scrollable container breaks scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=150974

            Bug ID: 150974
           Summary: Dynamic content in '-webkit-scrolling-touch'
                    scrollable container breaks scrolling
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.0
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: thomas.kelly at shopify.com

Summary:
When the content of a scrollable container using '-webkit-overflow-scrolling: touch' changes height from being smaller then the container to larger, the container is not scrollable.

Steps to Reproduce:
1. Open this CodePen in iOS9 Safari http://s.codepen.io/t-kelly/debug/qOowZR
2. Touch the first container using '-webkit-overflow-scrolling: touch' expand the content.
3. Notice how it cannot be scrolled.
4. Touch the other containers not using '-webkit-overflow-scrolling: touch' and then notice how they are still scrollable.

Expected Results:
A container using '-webkit-overflow-scrolling: touch' should be scrollable when the content inside it changes in height and requires scrolling.

Actual Results:
Content inside a container using '-webkit-overflow-scrolling: touch' is not scrollable

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