Add optional submitter parameter to FormData constructor

Category: Miscellaneous
Type: Chromium catches up
Status: Enabled by default (Chrome 112)
Intent stage: Prepare to ship

Breaking change: No
Enterprise impact: None
Spec maturity: Published standard
Web Platform Tests: Yes

WPT details: https://wpt.fyi/results/xhr/formdata/constructor-submitter.html?label=master&label=experimental&aligned&view=subtest&q=constructor-submitter

Summary

Allow passing a submit button to the FormData constructor. If the button has a name or is an image button, it will contribute to the form data set. This makes it possible to create a FormData object with the same data set as a vanilla form submission triggered by the button.

Standards & signals

Specification: https://xhr.spec.whatwg.org/#interface-formdata
Firefox: Shipped/Shipping — Merged but not yet released
Safari: Shipped/Shipping — Merged but not yet released
Web developers: Positive
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1410542

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=constructor-submitter
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Add%20optional%20submitter%20parameter%20to%20FormData%20constructor
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Add%20optional%20submitter%20parameter%20to%20FormData%20constructor
Baseline status: https://webstatus.dev/?q=Add%20optional%20submitter%20parameter%20to%20FormData%20constructor

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