[Webkit-unassigned] [Bug 153852] New: <body> with overflow:hidden CSS is scrollable on iOS

Wed Feb 3 18:58:32 PST 2016

https://bugs.webkit.org/show_bug.cgi?id=153852

            Bug ID: 153852
           Summary: <body> with overflow:hidden CSS is scrollable on iOS
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: iOS
                OS: iOS 9.2
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at chrisrebert.com

Created attachment 270621
  --> https://bugs.webkit.org/attachment.cgi?id=270621&action=review
Testcase demonstrating the problem

Applying `overflow: hidden` to the `<body>` should make it non-scrollable.
This works correctly on OS X Safari, but doesn't work correctly on iOS Safari.

Original Bootstrap issue:
Lost to the sands of time, but https://github.com/twbs/bootstrap/issues/14839 is relevant & popular.
See also http://getbootstrap.com/getting-started/#overflow-and-scrolling

Steps to reproduce:
1. Open the attached testcase in iOS Safari.
2. Tap the "Launch demo modal" button.
3. A yellow box with text appears.
4. Scroll the yellow box to its bottom, where there are "Close" and "Save changes" buttons, and lift your finger off the screen to ensure that the scroll gesture ends.
5. Attempt to scroll the yellow box further downward (which is to say, apply a "fling upward" gesture to the yellow box).

Actual result:
The <body> underneath the yellow box scrolls downward.

Expected result:
The <body> should not scroll (just like on OS X Safari).

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