Shadow DOM v0

Chrome and other browsers implemented the new version, see V0 is scheduled for deprecation starting in April 2018 and removal in April 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.


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


Enabled by default (tracking bug) in:

  • Chrome for desktop release 35
  • Chrome for Android release 35
  • Opera release 22
  • Opera for Android release 22

Consensus & Standardization

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


Last updated on 2018-04-10