[Webkit-unassigned] [Bug 256879] New: Mouseout event not fired from elements inside iframe when moving cursor out of safari or over development tools

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256879

            Bug ID: 256879
           Summary: Mouseout event not fired from elements inside iframe
                    when moving cursor out of safari or over development
                    tools
           Product: WebKit
           Version: Safari 16
          Hardware: Mac (Intel)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pawel.kaptur at smartframe.io

Created attachment 466377

  --> https://bugs.webkit.org/attachment.cgi?id=466377&action=review

video showing mouseout event not firing

Description:
Mouseout event is not fired from element inside iframe when moving cursor from this element directly over devtools or outside browser.

What steps will reproduce the problem?
(1) Please go to https://codesandbox.io/s/serene-shape-iefcvv
(2) Open devtools on the right side
(3) Move cursor over red rectangle
(4) Move cursor over devtools

What is the expected result?
Mouseout event should be fired not only from iframe but for content also.

What happens instead?
Mouseout event is not fired from content of iframe.

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