Custom Elements let web authors define their own tags. Chrome shipped an implementation based on the working draft of the spec in M33. The current editor's draft of the spec has significant updates based on web developer and implementer feedback.

Documentation

Specification

Specification link


Specification currently under development in a Working Group

Status in Chromium

Blink


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

Owner

Comments

Safari has indicated that they will not implement customized built-in elements, eg https://github.com/w3c/webcomponents/issues/544#issuecomment-239301184

Last updated on 2020-11-09