By wim leers on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.8.x
Introduced in version: 
8.8.0-alpha1
Issue links: 
https://www.drupal.org/node/3084069
Description: 

Themes can now be marked experimental by adding the following to their *.info.yml file:

experimental: true

This results in similar installation warnings as for modules that are in the Core (Experimental) package.

Impacts: 
Themers