[Webkit-unassigned] [Bug 153224] New: Tapping into an <input> within a position:fixed element scrolls to the top of the page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153224

            Bug ID: 153224
           Summary: Tapping into an <input> within a position:fixed
                    element scrolls to the top of the page
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: iOS
                OS: iOS 9.0
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at chrisrebert.com

iOS version: 9.2
Testcase: http://output.jsbin.com/qicigu/1
Original Bootstrap bug report: https://github.com/twbs/bootstrap/issues/17497

Steps to reproduce:
1. Open http://output.jsbin.com/qicigu/1 in iOS Safari.
2. Scroll to the bottom of the page.
3. Tap the "Open modal" button.
4. A yellow overlay appears.
5. Tap on the <input> that has the text "Click here".

Actual result:
The page scrolls to the top, the input becomes focused, and the on-screen keyboard appears.

Expected result:
The input should become focused and the on-screen keyboard should appear.
The scroll position of the page should not change.

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