Policy on 3rd party assets on Drupal.org
Policy for including 3rd party code.
#Documentation
Resources
Additional layout builder modules
Drupal list of additional layout builder modules.
Composer Patches Docs
Cweagans composer patches documentation.
Running PHPUnit Tests
Drupal documentation for PHPUnit tests.
6.15. Concept: Text Formats and Editors
Drupal user guide for text formats and editors.
Drush Configuration
Drush.yml configuration.
Dialog Modal Pattern
WCAG accessibility guidance for dialog pattern.
<dialog>: The Dialog element
MDN documentation for dialog element.
4.11.4 The dialog element
HTML spec for dialog element.
CSS architecture - for Drupal 9
Drupal css architecture documentation.