diff --git a/core/modules/node/tests/src/Functional/NodeAdminTest.php b/core/modules/node/tests/src/Functional/NodeAdminTest.php
index 4b0412cc9b5..c5719eb9a67 100644
--- a/core/modules/node/tests/src/Functional/NodeAdminTest.php
+++ b/core/modules/node/tests/src/Functional/NodeAdminTest.php
@@ -15,7 +15,7 @@ class NodeAdminTest extends NodeTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * A user with permission to bypass access content.
@@ -104,8 +104,7 @@ class NodeAdminTest extends NodeTestBase {
     $this->drupalGet('admin/content');
     foreach ($nodes_query as $delta => $string) {
       // Verify that the node was found in the correct order.
-      $this->assertSession()->elementExists('xpath', $this->assertSession()->buildXPathQuery('//table[contains(@class, :class)]/tbody/tr[' . ($delta + 1) . ']/td[2]/a[normalize-space(text())=:label]', [
-        ':class' => 'views-table',
+      $this->assertSession()->elementExists('xpath', $this->assertSession()->buildXPathQuery('//table/tbody/tr[' . ($delta + 1) . ']/td[2]/a[normalize-space(text())=:label]', [
         ':label' => $string,
       ]));
     }
@@ -121,8 +120,7 @@ class NodeAdminTest extends NodeTestBase {
     $this->drupalGet('admin/content', ['query' => ['sort' => 'asc', 'order' => 'title']]);
     foreach ($nodes_query as $delta => $string) {
       // Verify that the node was found in the correct order.
-      $this->assertSession()->elementExists('xpath', $this->assertSession()->buildXPathQuery('//table[contains(@class, :class)]/tbody/tr[' . ($delta + 1) . ']/td[2]/a[normalize-space(text())=:label]', [
-        ':class' => 'views-table',
+      $this->assertSession()->elementExists('xpath', $this->assertSession()->buildXPathQuery('//table/tbody/tr[' . ($delta + 1) . ']/td[2]/a[normalize-space(text())=:label]', [
         ':label' => $string,
       ]));
     }
diff --git a/core/modules/node/tests/src/Functional/NodeDisplayConfigurableTest.php b/core/modules/node/tests/src/Functional/NodeDisplayConfigurableTest.php
index f44bc25168c..f80a5186613 100644
--- a/core/modules/node/tests/src/Functional/NodeDisplayConfigurableTest.php
+++ b/core/modules/node/tests/src/Functional/NodeDisplayConfigurableTest.php
@@ -23,7 +23,7 @@ class NodeDisplayConfigurableTest extends NodeTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * {@inheritdoc}
@@ -167,6 +167,8 @@ class NodeDisplayConfigurableTest extends NodeTestBase {
     return [
       ['bartik', 'header', TRUE],
       ['claro', 'footer', TRUE],
+      // @todo Remove Classy from data provider in
+      // https://www.drupal.org/project/drupal/issues/3110137.
       ['classy', 'footer', TRUE],
       // @todo Add coverage for olivero after fixing
       // https://www.drupal.org/project/drupal/issues/3215220.
diff --git a/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php b/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
index 4939108c87c..8683c4c1670 100644
--- a/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
+++ b/core/modules/node/tests/src/Functional/NodeFieldMultilingualTest.php
@@ -25,7 +25,7 @@ class NodeFieldMultilingualTest extends BrowserTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   protected function setUp(): void {
     parent::setUp();
@@ -140,7 +140,7 @@ class NodeFieldMultilingualTest extends BrowserTestBase {
 
     // Check if node body is showed.
     $this->drupalGet('node/' . $node->id());
-    $this->assertSession()->elementTextEquals('xpath', "//article[contains(concat(' ', normalize-space(@class), ' '), ' node ')]//div[contains(concat(' ', normalize-space(@class), ' '), 'node__content')]/descendant::p", $node->body->value);
+    $this->assertSession()->elementTextEquals('xpath', "//article/div//p", $node->body->value);
   }
 
 }
diff --git a/core/modules/node/tests/src/Functional/NodePostSettingsTest.php b/core/modules/node/tests/src/Functional/NodePostSettingsTest.php
index dcdba3dc3e6..a9a670d6210 100644
--- a/core/modules/node/tests/src/Functional/NodePostSettingsTest.php
+++ b/core/modules/node/tests/src/Functional/NodePostSettingsTest.php
@@ -13,7 +13,7 @@ class NodePostSettingsTest extends NodeTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   protected function setUp(): void {
     parent::setUp();
@@ -46,7 +46,7 @@ class NodePostSettingsTest extends NodeTestBase {
 
     // Check that the post information is displayed.
     $node = $this->drupalGetNodeByTitle($edit['title[0][value]']);
-    $this->assertSession()->elementsCount('xpath', '//div[contains(@class, "node__submitted")]', 1);
+    $this->assertSession()->pageTextContainsOnce('Submitted by');
     $node->delete();
 
     // Set "Basic page" content type to display post information.
@@ -63,7 +63,7 @@ class NodePostSettingsTest extends NodeTestBase {
     $this->submitForm($edit, 'Save');
 
     // Check that the post information is not displayed.
-    $this->assertSession()->elementNotExists('xpath', '//div[contains(@class, "node__submitted")]');
+    $this->assertSession()->pageTextNotContains('Submitted by');
   }
 
 }
diff --git a/core/modules/node/tests/src/Functional/NodeTitleTest.php b/core/modules/node/tests/src/Functional/NodeTitleTest.php
index 6ac592f6336..0d1a93e5023 100644
--- a/core/modules/node/tests/src/Functional/NodeTitleTest.php
+++ b/core/modules/node/tests/src/Functional/NodeTitleTest.php
@@ -4,6 +4,7 @@ namespace Drupal\Tests\node\Functional;
 
 use Drupal\comment\Tests\CommentTestTrait;
 use Drupal\Component\Utility\Html;
+use Drupal\Tests\system\Functional\Menu\AssertBreadcrumbTrait;
 
 /**
  * Tests node title.
@@ -13,6 +14,7 @@ use Drupal\Component\Utility\Html;
 class NodeTitleTest extends NodeTestBase {
 
   use CommentTestTrait;
+  use AssertBreadcrumbTrait;
 
   /**
    * Modules to enable.
@@ -24,7 +26,7 @@ class NodeTitleTest extends NodeTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * A user with permission to bypass access content.
@@ -70,12 +72,13 @@ class NodeTitleTest extends NodeTestBase {
     $this->assertEquals($this->xpath($xpath)[0]->getText(), $node->label() . ' | Drupal', 'Page title is equal to node title.');
 
     // Test breadcrumb in comment preview.
-    $this->drupalGet('comment/reply/node/' . $node->id() . '/comment');
-    $xpath = '//nav[@class="breadcrumb"]/ol/li[last()]/a';
-    $this->assertEquals($this->xpath($xpath)[0]->getText(), $node->label(), 'Node breadcrumb is equal to node title.');
+    $this->assertBreadcrumb('comment/reply/node/' . $node->id() . '/comment', [
+      '' => 'Home',
+      'node/' . $node->id() => $node->label(),
+    ]);
 
     // Verify that node preview title is equal to node title.
-    $this->assertSession()->elementTextEquals('xpath', "//article[contains(concat(' ', normalize-space(@class), ' '), ' node--type-{$node->bundle()} ')]/h2/a/span", $node->label());
+    $this->assertSession()->elementTextEquals('xpath', "//article/h2/a/span", $node->label());
 
     // Test node title is clickable on teaser list (/node).
     $this->drupalGet('node');
diff --git a/core/modules/node/tests/src/Functional/NodeTypeTest.php b/core/modules/node/tests/src/Functional/NodeTypeTest.php
index af119580864..5157b7d121f 100644
--- a/core/modules/node/tests/src/Functional/NodeTypeTest.php
+++ b/core/modules/node/tests/src/Functional/NodeTypeTest.php
@@ -28,7 +28,7 @@ class NodeTypeTest extends NodeTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * Ensures that node type functions (node_type_get_*) work correctly.
@@ -78,7 +78,7 @@ class NodeTypeTest extends NodeTestBase {
     $this->drupalGet('node/add');
     $this->assertSession()->responseHeaderContains('X-Drupal-Cache-Tags', 'config:node_type_list');
     $this->assertCacheContext('user.permissions');
-    $elements = $this->cssSelect('dl.node-type-list dt');
+    $elements = $this->cssSelect('dl dt');
     $this->assertCount(3, $elements);
 
     $edit = [
@@ -92,7 +92,7 @@ class NodeTypeTest extends NodeTestBase {
     $this->assertTrue($type_exists, 'The new content type has been created in the database.');
 
     $this->drupalGet('node/add');
-    $elements = $this->cssSelect('dl.node-type-list dt');
+    $elements = $this->cssSelect('dl dt');
     $this->assertCount(4, $elements);
   }
 
diff --git a/core/modules/node/tests/src/Functional/NodeViewTest.php b/core/modules/node/tests/src/Functional/NodeViewTest.php
index c1cd40f33c3..6894265978b 100644
--- a/core/modules/node/tests/src/Functional/NodeViewTest.php
+++ b/core/modules/node/tests/src/Functional/NodeViewTest.php
@@ -15,7 +15,7 @@ class NodeViewTest extends NodeTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * Tests the html head links.
@@ -60,7 +60,7 @@ class NodeViewTest extends NodeTestBase {
     $node = $this->drupalCreateNode(['title' => $title]);
     $this->drupalGet($node->toUrl());
     // Verify that the passed title was returned.
-    $this->assertSession()->elementTextEquals('xpath', '//span[contains(@class, "field--name-title")]', $title);
+    $this->assertSession()->elementTextEquals('xpath', '//h1/span', $title);
   }
 
 }
diff --git a/core/modules/node/tests/src/Functional/PagePreviewTest.php b/core/modules/node/tests/src/Functional/PagePreviewTest.php
index 9f188c00101..28e8a3a701c 100644
--- a/core/modules/node/tests/src/Functional/PagePreviewTest.php
+++ b/core/modules/node/tests/src/Functional/PagePreviewTest.php
@@ -45,7 +45,16 @@ class PagePreviewTest extends NodeTestBase {
   ];
 
   /**
-   * {@inheritdoc}
+   * The theme to install as the default for testing.
+   *
+   * @var string
+   *
+   * @todo The fact that PagePreviewTest::testPagePreview() makes assertions
+   *   related to the node type being used for a body class makes Stark a bad
+   *   fit as a base theme. Change the default theme to Starterkit once it is
+   *   stable.
+   *
+   * @see https://www.drupal.org/project/drupal/issues/3274077
    */
   protected $defaultTheme = 'classy';
 
diff --git a/core/modules/node/tests/src/Functional/Views/FrontPageTest.php b/core/modules/node/tests/src/Functional/Views/FrontPageTest.php
index 7f36d63580f..c790b1666d9 100644
--- a/core/modules/node/tests/src/Functional/Views/FrontPageTest.php
+++ b/core/modules/node/tests/src/Functional/Views/FrontPageTest.php
@@ -24,7 +24,7 @@ class FrontPageTest extends ViewTestBase {
   /**
    * {@inheritdoc}
    */
-  protected $defaultTheme = 'classy';
+  protected $defaultTheme = 'stark';
 
   /**
    * {@inheritdoc}
@@ -189,7 +189,7 @@ class FrontPageTest extends ViewTestBase {
     $this->drupalGet('node');
     $this->assertSession()->statusCodeEquals(200);
     // Check that the frontpage view was rendered.
-    $this->assertSession()->responseMatches('/class=".+view-frontpage/');
+    $this->assertSession()->elementExists('css', '.views-element-container');
   }
 
   /**