By catch on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Issue links: 
https://www.drupal.org/node/3432183
https://www.drupal.org/node/3449469
https://www.drupal.org/node/2880237
Description: 

The following CSS files have been removed from the system/base library and moved to other core libraries:

css/components/ajax-progress.module.css has been moved to core/misc/components/ajax-progress.module.css and is included in the core/drupal.ajax library.

css/components/autocomplete-loading.module.css has been moved to core/misc/components/autocomplete-loading.module.css and is included in the core/drupal.autocomplete library.

core/modules/system/css/components/progress.module.css has been moved to core/misc/components/progress.module.css and is included in the core/drupal.progress library.

core/modules/system/css/components/tabledrag.module.css has been moved to core/misc/components/tabledrag.module.css and is included in the core/drupal.tabledrag library.
core/modules/system/css/components/tree-child.module.css has been moved to core/misc/components/tree-child.module.css and is included in the core/drupal.tabledrag library.

Themes using libraries-override to replace these CSS files will need to update for the new library locations. See for example this change in claro:

diff --git a/core/themes/claro/claro.info.yml b/core/themes/claro/claro.info.yml
index 5b8fd2393527301e88f3799f7d23e99ff196a0a2..85f834a158b3e3f26cfc7dd8b51d26af8b1efe56 100644
--- a/core/themes/claro/claro.info.yml
+++ b/core/themes/claro/claro.info.yml
@@ -22,15 +22,23 @@ libraries:
   - core/normalize
   - claro/global-styling
 libraries-override:
+  core/drupal.tabledrag:
+    css:
+      component:
+        misc/components/tabledrag.module.css: css/components/tabledrag.css
+
+  core/drupal.autocomplete:
+    css:
+      component:
+        misc/components/autocomplete-loading.module.css: css/components/autocomplete-loading.module.css
+
   system/base:
     css:
       component:
         css/components/ajax-progress.module.css: css/components/ajax-progress.module.css
-        css/components/autocomplete-loading.module.css: css/components/autocomplete-loading.module.css
         css/components/system-status-counter.css: css/components/system-status-counter.css
         css/components/system-status-report-counters.css: css/components/system-status-report-counters.css
         css/components/system-status-report-general-info.css: css/components/system-status-report-general-info.css
-        css/components/tabledrag.module.css: css/components/tabledrag.css
 
   system/admin:
     css:
Impacts: 
Themers