[Webkit-unassigned] [Bug 259781] New: form associated checkbox not removed from form data once checked

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=259781

            Bug ID: 259781
           Summary: form associated checkbox not removed from form data
                    once checked
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: david at enke.dev
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Form associated custom element checkboxes are not removed from form data once unchecked.
If checked, the name and value are present in form data as expected.

Expected:
Once unchecked, the checkbox is not part of the derived form data.
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/checkbox#sect3

Actual:
Once unchecked, the name and value are still part of the form data and not removed.

Reproduction:
https://stackblitz.com/edit/safari-form-associated-checkbox-bug?file=index.html

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