only in patch2:
unchanged:
--- a/core/themes/claro/css/theme/ckeditor-editor.pcss.css
+++ b/core/themes/claro/css/theme/ckeditor-editor.pcss.css
@@ -104,3 +104,9 @@
 [disabled] + .cke .cke_path_empty::after {
   content: none;
 }
+.ckeditor-buttons li a:focus {
+  outline: -webkit-focus-ring-color auto 1px;
+}
+.ckeditor-buttons li a:hover {
+  outline: -webkit-focus-ring-color auto 1px;
+}