diff --git a/core/core.libraries.yml b/core/core.libraries.yml
index e973b51b36d69177500dbef0969039e82c9092f9..2f48b0073f3fe2fb0030076787bed4a83c4ce7c0 100644
--- a/core/core.libraries.yml
+++ b/core/core.libraries.yml
@@ -481,6 +481,7 @@ jquery.ui.accordion:
   dependencies:
     - core/jquery.ui
     - core/jquery.ui.widget
+  deprecated: &jquery_ui_unused_deprecated The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
 
 jquery.ui.autocomplete:
   version: *jquery_ui_version
@@ -523,6 +524,7 @@ jquery.ui.checkboxradio:
   dependencies:
     - core/jquery.ui
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.controlgroup:
   version: *jquery_ui_version
@@ -535,6 +537,7 @@ jquery.ui.controlgroup:
   dependencies:
     - core/jquery.ui
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.datepicker:
   version: *jquery_ui_version
@@ -584,12 +587,14 @@ jquery.ui.droppable:
     - core/jquery.ui.widget
     - core/jquery.ui.mouse
     - core/jquery.ui.draggable
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.core:
   version: *jquery_ui_version
   license: *jquery_ui_license
   js:
     assets/vendor/jquery.ui/ui/effect-min.js: { weight: -9, minified: true }
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.blind:
   version: *jquery_ui_version
@@ -598,6 +603,7 @@ jquery.ui.effects.blind:
     assets/vendor/jquery.ui/ui/effects/effect-blind-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.bounce:
   version: *jquery_ui_version
@@ -606,6 +612,7 @@ jquery.ui.effects.bounce:
     assets/vendor/jquery.ui/ui/effects/effect-bounce-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.clip:
   version: *jquery_ui_version
@@ -614,6 +621,7 @@ jquery.ui.effects.clip:
     assets/vendor/jquery.ui/ui/effects/effect-clip-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.drop:
   version: *jquery_ui_version
@@ -622,6 +630,7 @@ jquery.ui.effects.drop:
     assets/vendor/jquery.ui/ui/effects/effect-drop-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.explode:
   version: *jquery_ui_version
@@ -630,6 +639,7 @@ jquery.ui.effects.explode:
     assets/vendor/jquery.ui/ui/effects/effect-explode-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.fade:
   version: *jquery_ui_version
@@ -638,6 +648,7 @@ jquery.ui.effects.fade:
     assets/vendor/jquery.ui/ui/effects/effect-fade-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.fold:
   version: *jquery_ui_version
@@ -646,6 +657,7 @@ jquery.ui.effects.fold:
     assets/vendor/jquery.ui/ui/effects/effect-fold-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.highlight:
   version: *jquery_ui_version
@@ -654,6 +666,7 @@ jquery.ui.effects.highlight:
     assets/vendor/jquery.ui/ui/effects/effect-highlight-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.puff:
   version: *jquery_ui_version
@@ -663,6 +676,7 @@ jquery.ui.effects.puff:
   dependencies:
     - core/jquery.ui.effects.core
     - core/jquery.ui.effects.scale
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.pulsate:
   version: *jquery_ui_version
@@ -671,6 +685,7 @@ jquery.ui.effects.pulsate:
     assets/vendor/jquery.ui/ui/effects/effect-pulsate-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.scale:
   version: *jquery_ui_version
@@ -680,6 +695,7 @@ jquery.ui.effects.scale:
   dependencies:
     - core/jquery.ui.effects.core
     - core/jquery.ui.effects.size
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.shake:
   version: *jquery_ui_version
@@ -688,6 +704,7 @@ jquery.ui.effects.shake:
     assets/vendor/jquery.ui/ui/effects/effect-shake-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.size:
   version: *jquery_ui_version
@@ -696,6 +713,7 @@ jquery.ui.effects.size:
     assets/vendor/jquery.ui/ui/effects/effect-size-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.slide:
   version: *jquery_ui_version
@@ -704,6 +722,7 @@ jquery.ui.effects.slide:
     assets/vendor/jquery.ui/ui/effects/effect-slide-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.effects.transfer:
   version: *jquery_ui_version
@@ -712,6 +731,7 @@ jquery.ui.effects.transfer:
     assets/vendor/jquery.ui/ui/effects/effect-transfer-min.js: { minified: true }
   dependencies:
     - core/jquery.ui.effects.core
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.menu:
   version: *jquery_ui_version
@@ -754,6 +774,7 @@ jquery.ui.progressbar:
   dependencies:
     - core/jquery.ui
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.resizable:
   version: *jquery_ui_version
@@ -780,6 +801,7 @@ jquery.ui.selectable:
     - core/jquery.ui
     - core/jquery.ui.mouse
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.selectmenu:
   version: *jquery_ui_version
@@ -796,6 +818,7 @@ jquery.ui.selectmenu:
     - core/jquery.ui.menu
     - core/jquery.ui.position
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.slider:
   version: *jquery_ui_version
@@ -809,6 +832,7 @@ jquery.ui.slider:
     - core/jquery.ui
     - core/jquery.ui.mouse
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.sortable:
   version: *jquery_ui_version
@@ -832,6 +856,7 @@ jquery.ui.spinner:
     - core/jquery.ui
     - core/jquery.ui.widget
     - core/jquery.ui.button
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.tabs:
   version: *jquery_ui_version
@@ -844,6 +869,7 @@ jquery.ui.tabs:
   dependencies:
     - core/jquery.ui
     - core/jquery.ui.widget
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.tooltip:
   version: *jquery_ui_version
@@ -857,6 +883,7 @@ jquery.ui.tooltip:
     - core/jquery.ui
     - core/jquery.ui.widget
     - core/jquery.ui.position
+  deprecated: *jquery_ui_unused_deprecated
 
 jquery.ui.touch-punch:
   remote: https://github.com/furf/jquery-ui-touch-punch
diff --git a/core/tests/Drupal/KernelTests/Core/Asset/LegacyLibraryDiscoveryTest.php b/core/tests/Drupal/KernelTests/Core/Asset/LegacyLibraryDiscoveryTest.php
new file mode 100644
index 0000000000000000000000000000000000000000..8fbbe2851f5c189ff7fb8c7a359786fbaad8aaef
--- /dev/null
+++ b/core/tests/Drupal/KernelTests/Core/Asset/LegacyLibraryDiscoveryTest.php
@@ -0,0 +1,300 @@
+<?php
+
+namespace Drupal\KernelTests\Core\Asset;
+
+use Drupal\KernelTests\KernelTestBase;
+
+/**
+ * Tests that deprecated asset libraries trigger a deprecation error.
+ *
+ * @group Asset
+ * @group legacy
+ */
+class LegacyLibraryDiscoveryTest extends KernelTestBase {
+
+  /**
+   * The library discovery service.
+   *
+   * @var \Drupal\Core\Asset\LibraryDiscoveryInterface
+   */
+  protected $libraryDiscovery;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->libraryDiscovery = $this->container->get('library.discovery');
+  }
+
+  /**
+   * Tests that the jquery.ui.accordion library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.accordion" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiAccordion() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.accordion');
+  }
+
+  /**
+   * Tests that the jquery.ui.checkboxradio library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.checkboxradio" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiCheckboxradio() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.checkboxradio');
+  }
+
+  /**
+   * Tests that the jquery.ui.controlgroup library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.controlgroup" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiControlgroup() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.controlgroup');
+  }
+
+  /**
+   * Tests that the jquery.ui.droppable library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.droppable" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiDroppable() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.droppable');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.core library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.core" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsCore() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.core');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.blind library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.blind" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsBlind() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.blind');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.bounce library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.bounce" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsBounce() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.bounce');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.clip library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.clip" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsClip() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.clip');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.drop library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.drop" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsDrop() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.drop');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.explode library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.explode" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsExplode() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.explode');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.fade library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.fade" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsFade() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.fade');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.fold library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.fold" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsFold() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.fold');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.highlight library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.highlight" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsHighlight() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.highlight');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.puff library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.puff" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsPuff() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.puff');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.pulsate library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.pulsate" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsPulsate() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.pulsate');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.scale library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.scale" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsScale() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.scale');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.shake library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.shake" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsShake() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.shake');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.size library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.size" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsSize() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.size');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.slide library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.slide" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsSlide() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.slide');
+  }
+
+  /**
+   * Tests that the jquery.ui.effects.transfer library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.effects.transfer" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiEffectsTransfer() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.effects.transfer');
+  }
+
+  /**
+   * Tests that the jquery.ui.progressbar library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.progressbar" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiProgressbar() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.progressbar');
+  }
+
+  /**
+   * Tests that the jquery.ui.selectable library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.selectable" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiSelectable() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.selectable');
+  }
+
+  /**
+   * Tests that the jquery.ui.selectmenu library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.selectmenu" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiSelectmenu() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.selectmenu');
+  }
+
+  /**
+   * Tests that the jquery.ui.slider library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.slider" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiSlider() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.slider');
+  }
+
+  /**
+   * Tests that the jquery.ui.spinner library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.spinner" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiSpinner() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.spinner');
+  }
+
+  /**
+   * Tests that the jquery.ui.tabs library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.tabs" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiTabs() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.tabs');
+  }
+
+  /**
+   * Tests that the jquery.ui.tooltip library is deprecated.
+   *
+   * @expectedDeprecation The "core/jquery.ui.tooltip" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969
+   * @doesNotPerformAssertions
+   */
+  public function testJqueryUiTooltip() {
+    $this->libraryDiscovery->getLibraryByName('core', 'jquery.ui.tooltip');
+  }
+
+}
diff --git a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
index 1d5d4b9ec4a64a791d7ba61efe5d2c8b613527fc..6809f1b4f9560cb935daf15488c37cc116973f89 100644
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -140,6 +140,8 @@ public static function getSkippedDeprecations() {
       // This deprecation comes from behat/mink-browserkit-driver when updating
       // symfony/browser-kit to 4.3+.
       'The "Symfony\Component\BrowserKit\Response::getStatus()" method is deprecated since Symfony 4.3, use getStatusCode() instead.',
+      'The "core/jquery.ui.checkboxradio" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969',
+      'The "core/jquery.ui.controlgroup" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3067969',
       // @todo Remove in https://www.drupal.org/project/drupal/issues/3082655
       'Drupal\Tests\BrowserTestBase::$defaultTheme is required in drupal:9.0.0 when using an install profile that does not set a default theme. See https://www.drupal.org/node/2352949, which includes recommendations on which theme to use.',
       'The "core/html5shiv" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/node/3086383',