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12/11/2025
[Plan] Drupal 9 and 10 markup and CSS backwards compatibility
https://www.drupal.org/project/drupal/issues/2659890
12/11/2025 | #CSS
SMACSS
http://smacss.com/book/categorizing

Scalable and Modular Architecture for CSS.

12/11/2025
Replace Classy with a starterkit theme
https://www.drupal.org/project/drupal/issues/3050378
12/11/2025
Drupal core themes no longer extend Classy
https://www.drupal.org/node/3103178
12/11/2025 | #Twig
Twig Documentation 2.x
https://twig.symfony.com/doc/2.x/

* Drupal 10 will use Twig 3.x

12/11/2025 | #Module Development
Examples
https://www.drupal.org/project/examples

This module contains example code for things we often need to do in Drupal.

12/11/2025
Twig in Drupal
https://www.drupal.org/docs/theming-drupal/twig-in-drupal

Drupal uses Symfony's Twig templating language.

12/11/2025 | #Module Development
Drupal API: Extending and altering Drupal
https://api.drupal.org/api/drupal/core%21core.api.php/group/extending/9.3.x

Overview of extensions (modules, themes, profiles). Alteration methods (hooks, plugins, entities, services, routing...

12/11/2025
Remove Stable as a base theme of core themes
https://www.drupal.org/project/drupal/issues/3115223
12/11/2025
Stable base theme added as default for backwards compatibility
https://www.drupal.org/node/2580687