Change record status: 
Project: 
Introduced in branch: 
3.x
Introduced in version: 
3.0.0-alpha1
Description: 

The custom_elements_everywhere submodule is removed from the codebase.

There is no 100% replacement for enabling Custom Elements on all entities/bundles; each applicable bundle can have Custom Elements enabled in the corresponding "Manage display" tab in the UI.

In terms of configuration: in each applicable core.entity_view_display.TYPE.BUNDLE.VIEWMODE configuration entity, set third_party_settings.custom_elements.enabled = true.

Impacts: 
Site builders, administrators, editors
Module developers
Site templates, recipes and distribution developers