Customized built-in elements

Category: Web Components
Type: New or changed feature
Status: Enabled by default (Chrome 67)
Intent stage: None

Summary

Authors can now create custom elements which inherit from the semantics of native, built-in elements. This is helpful when web authors want to add features to their custom elements, but they cannot be implemented in CSS or JavaScript though the features are available in built-in elements.

Standards & signals

Specification: https://html.spec.whatwg.org/#custom-elements-customized-builtin-example
Firefox: In development
Safari: Negative
Web developers: Positive
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=648828

Docs: https://developers.google.com/web/fundamentals/web-components/customelements#extendhtml

View on chromestatus.com