[Webkit-unassigned] [Bug 239505] New: Focusable elements no longer receive focus in Safari 15.4

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239505

            Bug ID: 239505
           Summary: Focusable elements no longer receive focus in Safari
                    15.4
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ldebeasi at gmail.com

Created attachment 457911

  --> https://bugs.webkit.org/attachment.cgi?id=457911&action=review

Code reproduction

As of Safari 15.4, certain focusable elements such as <button> no longer receive focus.

Steps to reproduce:

1. Open the attached code reproduction in Safari 15.4 for macOS.
2. Press the "Tab" key. Observe that the button element does not receive focus.

Expected Behavior:

I expect that the button will receive focus.

Actual Behavior:

The button does not receive focus.

Other Information:

- This works as expected in the latest versions of Chrome and Firefox.
- This works as expected in Safari 15.2 for macOS.
- I can reproduce this in STP 143

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