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diff --git a/web/core/modules/comment/tests/src/Functional/CommentCSSTest.php b/web/core/modules/comment/tests/src/Functional/CommentCSSTest.php
new file mode 100644
index 000000000..e17534a72
--- /dev/null
+++ b/web/core/modules/comment/tests/src/Functional/CommentCSSTest.php
@@ -0,0 +1,137 @@
+<?php
+
+namespace Drupal\Tests\comment\Functional;
+
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\comment\CommentInterface;
+use Drupal\user\RoleInterface;
+use Drupal\comment\Entity\Comment;
+use Drupal\Tests\Traits\Core\GeneratePermutationsTrait;
+
+/**
+ * Tests CSS classes on comments.
+ *
+ * @group comment
+ */
+class CommentCSSTest extends CommentTestBase {
+
+  use GeneratePermutationsTrait;
+
+  protected function setUp() {
+    parent::setUp();
+
+    // Allow anonymous users to see comments.
+    user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, [
+      'access comments',
+      'access content'
+    ]);
+  }
+
+  /**
+   * Tests CSS classes on comments.
+   */
+  public function testCommentClasses() {
+    // Create all permutations for comments, users, and nodes.
+    $parameters = [
+      'node_uid' => [0, $this->webUser->id()],
+      'comment_uid' => [0, $this->webUser->id(), $this->adminUser->id()],
+      'comment_status' => [CommentInterface::PUBLISHED, CommentInterface::NOT_PUBLISHED],
+      'user' => ['anonymous', 'authenticated', 'admin'],
+    ];
+    $permutations = $this->generatePermutations($parameters);
+
+    foreach ($permutations as $case) {
+      // Create a new node.
+      $node = $this->drupalCreateNode(['type' => 'article', 'uid' => $case['node_uid']]);
+
+      // Add a comment.
+      /** @var \Drupal\comment\CommentInterface $comment */
+      $comment = Comment::create([
+        'entity_id' => $node->id(),
+        'entity_type' => 'node',
+        'field_name' => 'comment',
+        'uid' => $case['comment_uid'],
+        'status' => $case['comment_status'],
+        'subject' => $this->randomMachineName(),
+        'language' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+        'comment_body' => [LanguageInterface::LANGCODE_NOT_SPECIFIED => [$this->randomMachineName()]],
+      ]);
+      $comment->save();
+
+      // Adjust the current/viewing user.
+      switch ($case['user']) {
+        case 'anonymous':
+          if ($this->loggedInUser) {
+            $this->drupalLogout();
+          }
+          $case['user_uid'] = 0;
+          break;
+
+        case 'authenticated':
+          $this->drupalLogin($this->webUser);
+          $case['user_uid'] = $this->webUser->id();
+          break;
+
+        case 'admin':
+          $this->drupalLogin($this->adminUser);
+          $case['user_uid'] = $this->adminUser->id();
+          break;
+      }
+      // Request the node with the comment.
+      $this->drupalGet('node/' . $node->id());
+      $settings = $this->getDrupalSettings();
+
+      // Verify the data-history-node-id attribute, which is necessary for the
+      // by-viewer class and the "new" indicator, see below.
+      $this->assertIdentical(1, count($this->xpath('//*[@data-history-node-id="' . $node->id() . '"]')), 'data-history-node-id attribute is set on node.');
+
+      // Verify classes if the comment is visible for the current user.
+      if ($case['comment_status'] == CommentInterface::PUBLISHED || $case['user'] == 'admin') {
+        // Verify the by-anonymous class.
+        $comments = $this->xpath('//*[contains(@class, "comment") and contains(@class, "by-anonymous")]');
+        if ($case['comment_uid'] == 0) {
+          $this->assertTrue(count($comments) == 1, 'by-anonymous class found.');
+        }
+        else {
+          $this->assertFalse(count($comments), 'by-anonymous class not found.');
+        }
+
+        // Verify the by-node-author class.
+        $comments = $this->xpath('//*[contains(@class, "comment") and contains(@class, "by-node-author")]');
+        if ($case['comment_uid'] > 0 && $case['comment_uid'] == $case['node_uid']) {
+          $this->assertTrue(count($comments) == 1, 'by-node-author class found.');
+        }
+        else {
+          $this->assertFalse(count($comments), 'by-node-author class not found.');
+        }
+
+        // Verify the data-comment-user-id attribute, which is used by the
+        // drupal.comment-by-viewer library to add a by-viewer when the current
+        // user (the viewer) was the author of the comment. We do this in Java-
+        // Script to prevent breaking the render cache.
+        $this->assertIdentical(1, count($this->xpath('//*[contains(@class, "comment") and @data-comment-user-id="' . $case['comment_uid'] . '"]')), 'data-comment-user-id attribute is set on comment.');
+        $this->assertRaw(drupal_get_path('module', 'comment') . '/js/comment-by-viewer.js', 'drupal.comment-by-viewer library is present.');
+      }
+
+      // Verify the unpublished class.
+      $comments = $this->xpath('//*[contains(@class, "comment") and contains(@class, "unpublished")]');
+      if ($case['comment_status'] == CommentInterface::NOT_PUBLISHED && $case['user'] == 'admin') {
+        $this->assertTrue(count($comments) == 1, 'unpublished class found.');
+      }
+      else {
+        $this->assertFalse(count($comments), 'unpublished class not found.');
+      }
+
+      // Verify the data-comment-timestamp attribute, which is used by the
+      // drupal.comment-new-indicator library to add a "new" indicator to each
+      // comment that was created or changed after the last time the current
+      // user read the corresponding node.
+      if ($case['comment_status'] == CommentInterface::PUBLISHED || $case['user'] == 'admin') {
+        $this->assertIdentical(1, count($this->xpath('//*[contains(@class, "comment")]/*[@data-comment-timestamp="' . $comment->getChangedTime() . '"]')), 'data-comment-timestamp attribute is set on comment');
+        $expectedJS = ($case['user'] !== 'anonymous');
+        $this->assertIdentical($expectedJS, isset($settings['ajaxPageState']['libraries']) && in_array('comment/drupal.comment-new-indicator', explode(',', $settings['ajaxPageState']['libraries'])), 'drupal.comment-new-indicator library is present.');
+      }
+    }
+  }
+
+}