Shadow DOM v0 (deprecated)

Chrome and other browsers implemented the new version, see V0 is deprecated at Chrome 70, with expected removal in Chrome 75, around, Jun 2019. If you are still using this consider migrating to the new API or upgrading your Polymer library. Use --disable-blink-features=ShadowDOMV0 for testing if your site works without Shadow DOM V0 APIs. For more info:


Enabled in M35. The old prefixed implementation we had since M25 is being deprecated, please watch out for deprecation warnings in the devtools console. Updated IE views based on ("Under consideration"). Latest spec: see also for the styling aspects.



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