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diff --git a/web/core/modules/block/tests/src/Functional/BlockHtmlTest.php b/web/core/modules/block/tests/src/Functional/BlockHtmlTest.php
new file mode 100644
index 000000000..5f9afe916
--- /dev/null
+++ b/web/core/modules/block/tests/src/Functional/BlockHtmlTest.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Drupal\Tests\block\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests block HTML ID validity.
+ *
+ * @group block
+ */
+class BlockHtmlTest extends BrowserTestBase {
+
+  /**
+   * Modules to install.
+   *
+   * @var array
+   */
+  public static $modules = ['block', 'block_test'];
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalLogin($this->rootUser);
+
+    // Enable the test_html block, to test HTML ID and attributes.
+    \Drupal::state()->set('block_test.attributes', ['data-custom-attribute' => 'foo']);
+    \Drupal::state()->set('block_test.content', $this->randomMachineName());
+    $this->drupalPlaceBlock('test_html', ['id' => 'test_html_block']);
+
+    // Enable a menu block, to test more complicated HTML.
+    $this->drupalPlaceBlock('system_menu_block:admin');
+  }
+
+  /**
+   * Tests for valid HTML for a block.
+   */
+  public function testHtml() {
+    $this->drupalGet('');
+
+    // Ensure that a block's ID is converted to an HTML valid ID, and that
+    // block-specific attributes are added to the same DOM element.
+    $this->assertFieldByXPath('//div[@id="block-test-html-block" and @data-custom-attribute="foo"]', NULL, 'HTML ID and attributes for test block are valid and on the same DOM element.');
+
+    // Ensure expected markup for a menu block.
+    $elements = $this->xpath('//nav[contains(@class, :nav-class)]/ul[contains(@class, :ul-class)]/li', [':nav-class' => 'block-menu', ':ul-class' => 'menu']);
+    $this->assertTrue(!empty($elements), 'The proper block markup was found.');
+  }
+
+}