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Form-associated custom elements

Category

Web Components

Type

New or changed feature

Status

Enabled by default (Chrome 77)

Intent stage

Prepare to ship

• Breaking change: No
• Enterprise impact: None
• Spec maturity: Working draft
• Web Platform Tests: Yes

WPT details: https://wpt.fyi/results/custom-elements/HTMLElement-attachInternals.html https://github.com/web-platform-tests/wpt/pull/15740

Summary

Form-associated custom elements enable web authors to define and create custom elements which participate in form submission.

Standards & signals

• Specification: https://github.com/whatwg/html/pull/4383
• Firefox: Positive
• Safari: Positive
• Web developers: Strongly positive
• Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=905922

Ecosystem

• Web Platform Tests: https://wpt.fyi/results/?q=custom-elements%2FHTMLElement-attachInternals
• 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+Form-associated%20custom%20elements
• MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Form-associated%20custom%20elements
• Baseline status: https://webstatus.dev/?q=Form-associated%20custom%20elements

Docs: https://docs.google.com/document/d/1JO8puctCSpW-ZYGU8lF-h4FWRIDQNDVexzHoOQ2iQmY/edit?pli=1#heading=h.2hgix04sc53t

Explainers: https://docs.google.com/document/d/1JO8puctCSpW-ZYGU8lF-h4FWRIDQNDVexzHoOQ2iQmY/edit?usp=sharing#heading=h.2hgix04sc53t

View on chromestatus.com