diff --git a/core/core.library.yml b/core/core.library.yml
index fb60744..bd44d88 100644
--- a/core/core.library.yml
+++ b/core/core.library.yml
@@ -65,7 +65,7 @@ drupal.autocomplete:
 drupal.batch:
   version: VERSION
   js:
-    misc/batch.js: { group: 0, cache: false }
+    misc/batch.js: { cache: false }
   dependencies:
     - core/jquery
     - core/drupal
@@ -77,7 +77,7 @@ drupal.batch:
 drupal.collapse:
   version: VERSION
   js:
-    misc/collapse.js: { group: 0 }
+    misc/collapse.js: {}
   dependencies:
     - core/jquery
     - core/modernizr
@@ -164,7 +164,7 @@ drupal.machine-name:
 drupal.progress:
   version: VERSION
   js:
-    misc/progress.js: { group: 0 }
+    misc/progress.js: {}
   dependencies:
     - core/drupal
     - core/jquery
diff --git a/core/includes/common.inc b/core/includes/common.inc
index 1b434b7..d05f4fb 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -2769,13 +2769,16 @@ function drupal_get_library($extension, $name = NULL) {
     $libraries[$extension] = array();
     if ($extension === 'core') {
       $path = 'core';
+      $extension_type = 'core';
     }
     else {
       // @todo Add a $type argument OR automatically figure out the type based
       //   on current extension data, possibly using a module->theme fallback.
       $path = drupal_get_path('module', $extension);
+      $extension_type = 'module';
       if (!$path) {
         $path = drupal_get_path('theme', $extension);
+        $extension_type = 'theme';
       }
     }
     $library_file = DRUPAL_ROOT . '/' . $path . '/' . $extension . '.library.yml';
@@ -2809,10 +2812,16 @@ function drupal_get_library($extension, $name = NULL) {
           if (!is_array($options)) {
             $options = array();
           }
-          // Apply the JS_LIBRARY group if it wasn't explicitly set.
-          if (!isset($options['group']) && $type == 'js') {
+          // Unconditionally apply default groups for the defined asset files.
+          // The library system is a dependency management system. Each library
+          // properly specifies its dependencies instead of relying on a custom
+          // processing order.
+          if ($type == 'js') {
             $options['group'] = JS_LIBRARY;
           }
+          elseif ($type == 'css') {
+            $options['group'] = $extension_type == 'module' ? CSS_AGGREGATE_DEFAULT : CSS_AGGREGATE_THEME;
+          }
           // By default, all library assets are files.
           if (!isset($options['type'])) {
             $options['type'] = 'file';
diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 46bd850..3dee6af 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2412,25 +2412,9 @@ function template_preprocess_maintenance_page(&$variables) {
   // These are usually added from system_page_build() except maintenance.css.
   // When the database is inactive it's not called so we add it here.
   $default_css['library'][] = array('core', 'normalize');
-  $path = drupal_get_path('module', 'system');
-  // Adjust the weights to load these early.
-  $default_css['css'][$path . '/css/system.module.css'] = array(
-    'weight' => CSS_COMPONENT - 10,
-    'every_page' => TRUE,
-  );
-  $default_css['css'][$path . '/css/system.theme.css'] = array(
-    'weight' => CSS_SKIN - 10,
-    'every_page' => TRUE,
-  );
-  // Unlike regular pages, the admin.css is added for every maintenance page.
-  $default_css['css'][$path . '/css/system.admin.css'] = array(
-    'weight' => CSS_COMPONENT - 10,
-    'every_page' => TRUE,
-  );
-  $default_css['css'][$path . '/css/system.maintenance.css'] = array(
-    'weight' => CSS_COMPONENT - 10,
-    'every_page' => TRUE,
-  );
+  $default_css['library'][] = array('system', 'base');
+  $default_css['library'][] = array('system', 'admin');
+  $default_css['library'][] = array('system', 'maintenance');
   $attached = array('#attached' => $default_css);
   drupal_render($attached);
 
diff --git a/core/modules/ckeditor/lib/Drupal/ckeditor/Plugin/Editor/CKEditor.php b/core/modules/ckeditor/lib/Drupal/ckeditor/Plugin/Editor/CKEditor.php
index 73523fd..8375549 100644
--- a/core/modules/ckeditor/lib/Drupal/ckeditor/Plugin/Editor/CKEditor.php
+++ b/core/modules/ckeditor/lib/Drupal/ckeditor/Plugin/Editor/CKEditor.php
@@ -250,14 +250,6 @@ public function settingsFormSubmit(array $form, array &$form_state) {
   /**
    * {@inheritdoc}
    */
-  public function getGlobalJSSettings(EditorEntity $editor) {
-    $settings['ckeditor']['modulePath'] = drupal_get_path('module', 'ckeditor');
-    return $settings;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
   public function getJSSettings(EditorEntity $editor) {
     $settings = array();
 
diff --git a/core/modules/edit/edit.module b/core/modules/edit/edit.module
index 5291bb7..aee37af 100644
--- a/core/modules/edit/edit.module
+++ b/core/modules/edit/edit.module
@@ -55,7 +55,9 @@ function edit_page_build(&$page) {
 function edit_library_info_alter(&$libraries, $module) {
   if ($module == 'edit') {
     $css = _edit_theme_css();
-    $libraries['edit']['css'] = array_merge($libraries['edit']['css'], $css);
+    foreach ($css as $css_file) {
+      $libraries['edit']['css'][$css_file] = array();
+    }
   }
 }
 
@@ -136,7 +138,7 @@ function _edit_theme_css($theme = NULL) {
     if (isset($info['edit_stylesheets'])) {
       $css = $info['edit_stylesheets'];
       foreach ($css as $key => $path) {
-        $css[$key] = array('type' => 'file', 'data' => $theme_path . '/' . $path);
+        $css[$key] = '/' . $theme_path . '/' . $path;
       }
     }
     if (isset($info['base theme'])) {
diff --git a/core/modules/editor/lib/Drupal/editor/Plugin/EditorBase.php b/core/modules/editor/lib/Drupal/editor/Plugin/EditorBase.php
index db616da..5610d33 100644
--- a/core/modules/editor/lib/Drupal/editor/Plugin/EditorBase.php
+++ b/core/modules/editor/lib/Drupal/editor/Plugin/EditorBase.php
@@ -65,11 +65,4 @@ public function settingsFormValidate(array $form, array &$form_state) {
   public function settingsFormSubmit(array $form, array &$form_state) {
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getGlobalJSSettings(Editor $editor) {
-    return array();
-  }
-
 }
diff --git a/core/modules/editor/lib/Drupal/editor/Plugin/EditorManager.php b/core/modules/editor/lib/Drupal/editor/Plugin/EditorManager.php
index 4ae77b6..3114e3a 100644
--- a/core/modules/editor/lib/Drupal/editor/Plugin/EditorManager.php
+++ b/core/modules/editor/lib/Drupal/editor/Plugin/EditorManager.php
@@ -65,7 +65,6 @@ public function getAttachments(array $format_ids) {
     $attachments = array('library' => array());
 
     $settings = array();
-    $global_settings_processed = array();
     foreach ($format_ids as $format_id) {
       $editor = editor_load($format_id);
       if (!$editor) {
@@ -77,16 +76,6 @@ public function getAttachments(array $format_ids) {
       // Libraries.
       $attachments['library'] = array_merge($attachments['library'], $plugin->getLibraries($editor));
 
-      // Global, format-agnostic JavaScript settings.
-      if (!isset($global_settings_processed[$editor->editor])) {
-        if ($global_settings = $plugin->getGlobalJSSettings($editor)) {
-          // Prevent editors from manipulating Editor module settings.
-          unset($global_settings['editor']);
-          $settings = array_merge($settings, $global_settings);
-        }
-        $global_settings_processed[$editor->editor] = TRUE;
-      }
-
       // Format-specific JavaScript settings.
       $settings['editor']['formats'][$format_id] = array(
         'format' => $format_id,
diff --git a/core/modules/editor/lib/Drupal/editor/Plugin/EditorPluginInterface.php b/core/modules/editor/lib/Drupal/editor/Plugin/EditorPluginInterface.php
index affc7d3..99b6a13 100644
--- a/core/modules/editor/lib/Drupal/editor/Plugin/EditorPluginInterface.php
+++ b/core/modules/editor/lib/Drupal/editor/Plugin/EditorPluginInterface.php
@@ -75,24 +75,6 @@ public function settingsFormValidate(array $form, array &$form_state);
   public function settingsFormSubmit(array $form, array &$form_state);
 
   /**
-   * Returns global JavaScript settings to be attached.
-   *
-   * Allows text editors to expose global settings (independent of text format)
-   * as JavaScript variables in drupalSettings.
-   *
-   * @param \Drupal\editor\Entity\Editor $editor
-   *   A configured text editor object.
-   *
-   * @return array
-   *   An array of settings that will be added to the page for use by this text
-   *   editor's JavaScript integration.
-   *
-   * @see drupal_process_attached()
-   * @see EditorManager::getAttachments()
-   */
-  public function getGlobalJSSettings(Editor $editor);
-
-  /**
    * Returns JavaScript settings to be attached.
    *
    * Most text editors use JavaScript to provide a WYSIWYG or toolbar on the
diff --git a/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php b/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php
index 299a6f2..b3ba306 100644
--- a/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php
+++ b/core/modules/editor/lib/Drupal/editor/Plugin/InPlaceEditor/Editor.php
@@ -87,13 +87,6 @@ public function getAttachments() {
 
     // Also include editor.module's formatted text editor.
     $attachments['library'][] = array('editor', 'edit.inPlaceEditor.formattedText');
-    $attachments['js'][] = array(
-      'type' => 'setting',
-      'data' => array(
-        'editor' => array('getUntransformedTextURL' => url('editor/!entity_type/!id/!field_name/!langcode/!view_mode'),
-        ),
-      ),
-    );
 
     return $attachments;
   }
diff --git a/core/modules/picture/picture.library.yml b/core/modules/picture/picture.library.yml
index f84ed26..695fae7 100644
--- a/core/modules/picture/picture.library.yml
+++ b/core/modules/picture/picture.library.yml
@@ -5,6 +5,6 @@ picturefill:
   # @see https://drupal.org/node/1775530
   version: VERSION
   js:
-    picturefill/picturefill.js: { weight: -10, group: 0 }
+    picturefill/picturefill.js: { weight: -10 }
   dependencies:
     - core/matchmedia
diff --git a/core/modules/system/system.library.yml b/core/modules/system/system.library.yml
index 8deb657..90c67d1 100644
--- a/core/modules/system/system.library.yml
+++ b/core/modules/system/system.library.yml
@@ -1,3 +1,27 @@
+base:
+  version: VERSION
+  css:
+    # Adjust the weights to load these early.
+    css/system.module.css: { every_page: true, weight: -10, }
+    css/system.theme.css: { every_page: true, weight: 190 }
+  dependencies:
+    - core/normalize
+
+admin:
+  version: VERSION
+  css:
+    css/system.admin.css: { weight: -10 }
+  dependencies:
+    - system/base
+
+maintenance:
+  version: VERSION
+  css:
+    css/system.maintenance.css: { weight: -10 }
+  dependencies:
+    - system/base
+    - system/admin
+
 drupal.system:
   version: VERSION
   js:
diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 2246dc1..302ef6f 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -1103,20 +1103,9 @@ function system_filetransfer_info() {
 function system_page_build(&$page) {
   // Ensure the same CSS is loaded in template_preprocess_maintenance_page().
   $page['#attached']['library'][] = array('core', 'normalize');
-  $path = drupal_get_path('module', 'system');
-  // Adjust the weights to load these early.
-  $page['#attached']['css'][$path . '/css/system.module.css'] = array(
-    'weight' => CSS_COMPONENT - 10,
-    'every_page' => TRUE,
-  );
-  $page['#attached']['css'][$path . '/css/system.theme.css'] = array(
-    'weight' => CSS_SKIN - 10,
-    'every_page' => TRUE,
-  );
+  $page['#attached']['library'][] = array('system', 'base');
   if (path_is_admin(current_path())) {
-    $page['#attached']['css'][$path . '/css/system.admin.css'] = array(
-      'weight' => CSS_COMPONENT - 10,
-    );
+    $page['#attached']['library'][] = array('system', 'admin');
   }
 }
 
diff --git a/core/modules/views/views.library.yml b/core/modules/views/views.library.yml
index 7391d1b..fe5f75d 100644
--- a/core/modules/views/views.library.yml
+++ b/core/modules/views/views.library.yml
@@ -6,8 +6,8 @@ views.module:
 views.ajax:
   version: VERSION
   js:
-    js/base.js: { group: 0 }
-    js/ajax_view.js: { group: 0 }
+    js/base.js: {}
+    js/ajax_view.js: {}
   dependencies:
     - core/jquery
     - core/drupal
diff --git a/core/modules/views_ui/views_ui.library.yml b/core/modules/views_ui/views_ui.library.yml
index 410609f..cf92482 100644
--- a/core/modules/views_ui/views_ui.library.yml
+++ b/core/modules/views_ui/views_ui.library.yml
@@ -1,9 +1,9 @@
 views_ui.admin:
   version: VERSION
   js:
-    js/ajax.js: { group: 0 }
-    js/dialog.views.js: { group: 0 }
-    js/views-admin.js: { group: 0 }
+    js/ajax.js: {}
+    js/dialog.views.js: {}
+    js/views-admin.js: {}
   dependencies:
     - core/jquery
     - core/drupal
@@ -16,4 +16,8 @@ views_ui.admin:
 views_ui.listing:
   version: VERSION
   js:
-    js/views_ui.listing.js: { group: 0 }
+    js/views_ui.listing.js: {}
+  dependencies:
+    - core/jquery
+    - core/drupal
+    - core/jquery.once
diff --git a/core/themes/bartik/bartik.library.yml b/core/themes/bartik/bartik.library.yml
index c4e3622..71f85d4 100644
--- a/core/themes/bartik/bartik.library.yml
+++ b/core/themes/bartik/bartik.library.yml
@@ -1,4 +1,6 @@
 maintenance_page:
   version: VERSION
   css:
-    css/maintenance-page.css: { group: 100 }
+    css/maintenance-page.css: {}
+  dependencies:
+    - system/maintenance
diff --git a/core/themes/seven/seven.library.yml b/core/themes/seven/seven.library.yml
index ff12caa..fd01adc 100644
--- a/core/themes/seven/seven.library.yml
+++ b/core/themes/seven/seven.library.yml
@@ -1,6 +1,8 @@
 install-page:
   version: VERSION
   js:
-    js/mobile.install.js: { group: 100 }
+    js/mobile.install.js: {}
   css:
-    install-page.css: { group: 100 }
+    install-page.css: {}
+  dependencies:
+    - system/maintenance
diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index 202f202..89d7c8b 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -197,13 +197,7 @@ function seven_preprocess_install_page(&$variables) {
 
   // Normally we could attach libraries via hook_page_alter(), but when the
   // database is inactive it's not called so we add them here.
-  $libraries = array(
-    '#attached' => array(
-      'library' => array(
-        array('seven', 'install-page'),
-      ),
-    ),
-  );
+  $libraries['#attached']['library'][] = array('seven', 'install-page');
   drupal_render($libraries);
 }