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diff --git a/web/core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php b/web/core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php
new file mode 100644
index 000000000..92b3a739f
--- /dev/null
+++ b/web/core/tests/Drupal/FunctionalJavascriptTests/Core/Form/FormGroupingElementsTest.php
@@ -0,0 +1,133 @@
+<?php
+
+namespace Drupal\FunctionalJavascriptTests\Core\Form;
+
+use Drupal\FunctionalJavascriptTests\JavascriptTestBase;
+
+/**
+ * Tests for form grouping elements.
+ *
+ * @group form
+ */
+class FormGroupingElementsTest extends JavascriptTestBase {
+
+  /**
+   * Required modules.
+   *
+   * @var array
+   */
+  public static $modules = ['form_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    $account = $this->drupalCreateUser();
+    $this->drupalLogin($account);
+  }
+
+  /**
+   * Tests that vertical tab children become visible.
+   *
+   * Makes sure that a child element of a vertical tab that is not visible,
+   * becomes visible when the tab is clicked, a fragment link to the child is
+   * clicked or when the URI fragment pointing to that child changes.
+   */
+  public function testVerticalTabChildVisibility() {
+    $session = $this->getSession();
+    $web_assert = $this->assertSession();
+
+    // Request the group vertical tabs testing page with a fragment identifier
+    // to the second element.
+    $this->drupalGet('form-test/group-vertical-tabs', ['fragment' => 'edit-element-2']);
+
+    $page = $session->getPage();
+
+    $tab_link_1 = $page->find('css', '.vertical-tabs__menu-item > a');
+
+    $child_1_selector = '#edit-element';
+    $child_1 = $page->find('css', $child_1_selector);
+
+    $child_2_selector = '#edit-element-2';
+    $child_2 = $page->find('css', $child_2_selector);
+
+    // Assert that the child in the second vertical tab becomes visible.
+    // It should be visible after initial load due to the fragment in the URI.
+    $this->assertTrue($child_2->isVisible(), 'Child 2 is visible due to a URI fragment');
+
+    // Click on a fragment link pointing to an invisible child inside an
+    // inactive vertical tab.
+    $session->executeScript("jQuery('<a href=\"$child_1_selector\"></a>').insertAfter('h1')[0].click()");
+
+    // Assert that the child in the first vertical tab becomes visible.
+    $web_assert->waitForElementVisible('css', $child_1_selector, 50);
+
+    // Trigger a URI fragment change (hashchange) to show the second vertical
+    // tab again.
+    $session->executeScript("location.replace('$child_2_selector')");
+
+    // Assert that the child in the second vertical tab becomes visible again.
+    $web_assert->waitForElementVisible('css', $child_2_selector, 50);
+
+    $tab_link_1->click();
+
+    // Assert that the child in the first vertical tab is visible again after
+    // a click on the first tab.
+    $this->assertTrue($child_1->isVisible(), 'Child 1 is visible after clicking the parent tab');
+  }
+
+  /**
+   * Tests that details element children become visible.
+   *
+   * Makes sure that a child element of a details element that is not visible,
+   * becomes visible when a fragment link to the child is clicked or when the
+   * URI fragment pointing to that child changes.
+   */
+  public function testDetailsChildVisibility() {
+    $session = $this->getSession();
+    $web_assert = $this->assertSession();
+
+    // Store reusable JavaScript code to remove the current URI fragment and
+    // close all details.
+    $reset_js = "location.replace('#'); jQuery('details').removeAttr('open')";
+
+    // Request the group details testing page.
+    $this->drupalGet('form-test/group-details');
+
+    $page = $session->getPage();
+
+    $session->executeScript($reset_js);
+
+    $child_selector = '#edit-element';
+    $child = $page->find('css', $child_selector);
+
+    // Assert that the child is not visible.
+    $this->assertFalse($child->isVisible(), 'Child is not visible');
+
+    // Trigger a URI fragment change (hashchange) to open all parent details
+    // elements of the child.
+    $session->executeScript("location.replace('$child_selector')");
+
+    // Assert that the child becomes visible again after a hash change.
+    $web_assert->waitForElementVisible('css', $child_selector, 50);
+
+    $session->executeScript($reset_js);
+
+    // Click on a fragment link pointing to an invisible child inside a closed
+    // details element.
+    $session->executeScript("jQuery('<a href=\"$child_selector\"></a>').insertAfter('h1')[0].click()");
+
+    // Assert that the child is visible again after a fragment link click.
+    $web_assert->waitForElementVisible('css', $child_selector, 50);
+
+    // Find the summary belonging to the closest details element.
+    $summary = $page->find('css', '#edit-meta > summary');
+
+    // Assert that both aria-expanded and aria-pressed are true.
+    $this->assertTrue($summary->getAttribute('aria-expanded'));
+    $this->assertTrue($summary->getAttribute('aria-pressed'));
+  }
+
+}