'submitter' property of 'submit' event

Category: DOM
Type: New or changed feature
Status: Enabled by default (Chrome 81)
Intent stage: Evaluate readiness to ship

Summary

The 'submit' event, which is dispatched on form submission, gets its own interface, SubmitEvent, which has a 'submitter' property.

Motivation

Some web applications do their own form submission by preventDefault()ing 'submit' event. However, the event didn't tell which submit button triggered this submission. Adding 'submitter' property to the event enables application to refer to an entry data, the formaction attribute, the formenctype attribute, the formmethod attribute, and the formtarget attribute of the submitter button.

Standards & signals

Specification: https://html.spec.whatwg.org/C/#the-submitevent-interface
Firefox: Positive
Safari: No signal
Web developers: Positive — See some comments in the issue.
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1014418

Docs: N/A

Explainers: N/A

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