[2] Add <form>'s "firing submission events" flag, tkent-google, 5/15/2019, 6:27:00 PM, 7/2/2021, 11:44:50 AM https://github.com/whatwg/html/commit/cb55dca6a71e79a5ce3e078dc8d7b525c890bfe8
Google search: oninvalid