diff --git a/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarHookToolbarTest.php b/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarHookToolbarTest.php
index d4f85b8b257..5716978d15d 100644
--- a/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarHookToolbarTest.php
+++ b/core/modules/toolbar/lib/Drupal/toolbar/Tests/ToolbarHookToolbarTest.php
@@ -50,8 +50,14 @@ class ToolbarHookToolbarTest extends WebTestBase {
     // Assert that the tab registered by toolbar_test is present.
     $this->assertRaw('id="toolbar-tab-testing"');
 
+    // Assert that the tab item descriptions are present.
+    $this->assertRaw('title="Test tab"');
+
     // Assert that the tray registered by toolbar_test is present.
     $this->assertRaw('id="toolbar-tray-testing"');
+
+    // Assert that tray item descriptions are present.
+    $this->assertRaw('title="Test link 1 title"');
   }
 
 }
diff --git a/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module b/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module
index ab7c2ad1f3c..3ccbf0a64d1 100644
--- a/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module
+++ b/core/modules/toolbar/tests/modules/toolbar_test/toolbar_test.module
@@ -31,9 +31,9 @@ function toolbar_test_toolbar() {
       'content' => array(
         '#theme' => 'item_list',
         '#items' => array(
-          l(t('link 1'), '<front>'),
-          l(t('link 2'), '<front>'),
-          l(t('link 3'), '<front>'),
+          l(t('link 1'), '<front>', array('attributes' => array('title' => 'Test link 1 title'))),
+          l(t('link 2'), '<front>', array('attributes' => array('title' => 'Test link 2 title'))),
+          l(t('link 3'), '<front>', array('attributes' => array('title' => 'Test link 3 title'))),
         ),
         '#prefix' => '<h2 class="visually-hidden">' . t('Test tray') . '</h2>',
         '#attributes' => array(
diff --git a/core/modules/toolbar/toolbar.module b/core/modules/toolbar/toolbar.module
index 52d398875e5..14135bbde83 100644
--- a/core/modules/toolbar/toolbar.module
+++ b/core/modules/toolbar/toolbar.module
@@ -515,6 +515,7 @@ function toolbar_menu_navigation_links(&$tree) {
         'icon',
         'icon-' . strtolower(str_replace(' ', '-', $item['link']['link_title'])),
       ),
+      'title' => check_plain($item['link']['description']),
     );
   }
 }