[Webkit-unassigned] [Bug 229660] New: SubmitEvent.submitter property isn't set for <button type="submit">

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229660

            Bug ID: 229660
           Summary: SubmitEvent.submitter property isn't set for <button
                    type="submit">
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Mac (Intel)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gilmoreorless at gmail.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Created attachment 436753

  --> https://bugs.webkit.org/attachment.cgi?id=436753&action=review

Reduced test case

I was testing out the new `SubmitEvent` interface implemented in Bug 202978, using Tech Preview 130. It appears to only be filling in the `submitter` property when a form is submitted with `<input type="submit">` but not `<button type="submit">`.

I've attached a simple HTML page that shows the problem. All the test cases work correctly in Chrome and Firefox, but the `<button type="submit">` case fails in Safari Tech Preview 130. I tried to test the latest raw WebKit build but couldn't run it due to Bug 228060.

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