[Webkit-unassigned] [Bug 218507] New: Up and down arrow keys in <input> have a different behavior when inside a shadow root

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218507

            Bug ID: 218507
           Summary: Up and down arrow keys in <input> have a different
                    behavior when inside a shadow root
           Product: WebKit
           Version: Safari 14
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cory at abeautifulsite.net
                CC: cdumez at apple.com, wenson_hsieh at apple.com

When an <input> is present inside a shadow root, pressing the up/down arrows no longer moves the cursor to the start/end of the field. The following fiddle demonstrates a standard input with the correct behavior and an input within a shadow root with differing behavior.

Fiddle: https://jsfiddle.net/me9yatxz/1/

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