Custom Elements V0 (deprecated)

Method for registering (creating) custom elements in script. V0 is deprecated at M70, and will be removed in M75, around, Jun 2019. For more info: The spec is superceded by Custom Elements V1 and Blink is the only engine that implements V0 APIs.


Edge's signal should be treated for implementing V1 spec. Firefox once implemented behind the flag, but removed in favor of V1 APIs. Safari did not implement Custom Elements V0 spec, but already implemented V1 APIs and shipped it.



Working draft or equivalent

Status in Chromium


Deprecated (tracking bug) in:

  • Chrome for desktop release 70
  • Chrome for Android release 70

Consensus & Standardization

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


Last updated on 2019-03-18