Change record status: 
Project: 
Introduced in branch: 
8.x-2.x
Introduced in version: 
Description: 

Previously, the custom elements markup was adding a class attribute "custom-element" to nested custom elements. This has been removed.

Anyone relying on the class will have to re-add it, e.g. by adding a custom custom-elements twig template.

Impacts: 
Themers