Created attachment 436753 [details] 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.
Thanks for the bug report and the test case. I'll fix.
Created attachment 436775 [details] Patch
Committed r281770 (241107@main): <https://commits.webkit.org/241107@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 436775 [details].
<rdar://problem/82538108>