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DocumentOrShadowRoot
The DocumentOrShadowRoot mixin of the Shadow DOM API provides APIs that are shared between documents and shadow roots. The following features are included in both Document and ShadowRoot.
The DocumentOrShadowRoot mixin of the Shadow DOM API provides APIs that are shared between documents and shadow roots. The following features are included in both Document and ShadowRoot.

Issue #2
Missing "Experimental API' icon. This content is essential because it is a warning to developers to be careful when using this property.
- Type of issue
- IV page is missing essential content
- Reported
- Feb 5, 2019