*Summary*:

  Scoped custom element registries are a strongly desired feature from the Web 
Components community. They allow creating per-shadowroot registries. While 
there is no current spec, there are implementations in both WebKit and 
Chromium. I intend to spend the next couple of months prototyping an 
implementation in Gecko.

*Bug*:
  https://bugzilla.mozilla.org/show_bug.cgi?id=1874414.

*Specification*:
  
https://github.com/WICG/webcomponents/blob/gh-pages/proposals/Scoped-Custom-Element-Registries.md

*Standards Body*:
  WICG

*Platform coverage*:
  all.

*Preference*:
  dom.scoped-custom-element-registries.enabled

*DevTools bug*:
 n/a.

*Link to standards-positions discussion*:
  https://github.com/mozilla/standards-positions/issues/424.

*Other browsers*:
  Blink: Prototyping.
  WebKit: Prototyping.

*web-platform-tests*:
  Many exist, but more will be written during the implementation.

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