basis_preprocess_page in core/themes/basis/template.php

Prepares variables for page templates.

ckeditor5_library_info in core/modules/ckeditor5/ckeditor5.module

Implements hook_library_info().

filter_library_info in core/modules/filter/filter.module

Implements hook_library_info().

system_library_info in core/modules/system/system.module

Implements hook_library_info().

views_ui_get_admin_css in core/modules/views_ui/views_ui.admin.inc

Create an array of Views admin CSS for adding or attaching.

_backdrop_theme_initialize in core/includes/theme.inc

Initializes the theme system given already loaded information.