[Webkit-unassigned] [Bug 210050] New: Cannot detect middle click with bluetooth mouse on iPadOS 13.4

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210050

            Bug ID: 210050
           Summary: Cannot detect middle click with bluetooth mouse on
                    iPadOS 13.4
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com

Middle clicks with a bluetooth mouse on iPadOS 13.4 register as a left click instead of a middle click. The 'button' property of both mousedown and pointerdown events is 0 (for left button), when it should be 1 (for middle button).

Demo: https://downloads.scirra.com/labs/ipadosmouse/

It works correctly with the same bluetooth mouse on macOS, so it is not the mouse. I used a Microsoft Bluetooth Mouse (RJN-00002).

This breaks any middle mouse button feature in web apps on iPadOS, like dragging the middle mouse button for pan scrolling.

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