By lewisnyman on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.0.x
Introduced in version: 
8.0.0
Issue links: 
https://www.drupal.org/node/2575533
Description: 

As the UI of Drupal improves between minor versions, the mark up and assets in the Seven theme will change. The Seven theme is not backwards compatible. If you wish to modify the output or assets of Seven you can:

  1. Copy the whole of Seven and rename it as your own admin theme. You will need to manually manage your own updates if you want to stay up to date with Seven's bug fixes and feature support.
  2. Sub-theme Seven. This is only recommended if you want to make minor tweaks and understand that Seven could break your modifications as it changes.
Impacts: 
Themers