[Webkit-unassigned] [Bug 171113] New: Incorrect position when dragging jQuery Draggable elements with position fixed after pinch zoom

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Fri Apr 21 08:10:20 PDT 2017


https://bugs.webkit.org/show_bug.cgi?id=171113

            Bug ID: 171113
           Summary: Incorrect position when dragging jQuery Draggable
                    elements with position fixed after pinch zoom
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zach.peters at pearson.com
                CC: cdumez at apple.com

Created attachment 307730

  --> https://bugs.webkit.org/attachment.cgi?id=307730&action=review

The zip file contains an example html page along with jQuery touch punch for testing on mobile devices.

After doing a pinch zoom if you try to drag a jQuery Draggable element with the style position fixed then the element jumps before beginning to drag. I've attached an example html page that can be used to reproduce this. This issue happens on normal Safari browser as well as inside an iOS app using Webkit.

NOTE: After you pinch zoom you need to make sure the viewport is not in the top left corner of the document. As you move the viewport further to the bottom right of the document the "jump" before dragging becomes larger and larger.

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