[Webkit-unassigned] [Bug 199858] New: keyup event with ShiftLeft/ShiftRight code sometimes not fired

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199858

            Bug ID: 199858
           Summary: keyup event with ShiftLeft/ShiftRight code sometimes
                    not fired
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ashley at scirra.com

Demo: https://www.scirra.com/labs/bugs/leftrightkeys.html

Steps to reproduce:
1. Open URL
2. Press down left shift
3. Press down right shift
4. Release left shift
5. Release right shift

What is the expected behavior?
keyup events should fire for both ShiftLeft and ShiftRight codes

What went wrong?
The keyup event for ShiftLeft is missing. It only fires for ShiftRight.

The same issue happens with control, alt and meta keys.

It works correctly in Chrome and Firefox so this issue is specific to Safari.

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