diff --git a/core/lib/Drupal/Core/Form/FormBuilder.php b/core/lib/Drupal/Core/Form/FormBuilder.php
index 332f81e..2330947 100644
--- a/core/lib/Drupal/Core/Form/FormBuilder.php
+++ b/core/lib/Drupal/Core/Form/FormBuilder.php
@@ -903,7 +903,7 @@ public function doBuildForm($form_id, &$element, FormStateInterface &$form_state
       $element['#defaults_loaded'] = TRUE;
     }
     // Assign basic defaults common for all form elements.
-    // NOTE: description_display is below by default, excepted for details.
+    // Note that #description_display is below by default, excepted for details.
     $element += array(
       '#required' => FALSE,
       '#attributes' => array(),
diff --git a/core/modules/system/src/Tests/Form/ElementsDetailsTest.php b/core/modules/system/src/Tests/Form/ElementsDetailsTest.php
index 84d67c2..872821d 100644
--- a/core/modules/system/src/Tests/Form/ElementsDetailsTest.php
+++ b/core/modules/system/src/Tests/Form/ElementsDetailsTest.php
@@ -2,7 +2,7 @@
 
 /**
  * @file
- * Definition of Drupal\system\Tests\Form\ElementsDetailsTest.
+ * Contains \Drupal\system\Tests\Form\ElementsDetailsTest.
  */
 
 namespace Drupal\system\Tests\Form;
@@ -26,26 +26,26 @@ class ElementsDetailsTest extends WebTestBase {
   /**
    * Tests different display options for details element descriptions.
    */
-  function testFieldsetDescriptions() {
+  public function testFieldsetDescriptions() {
     $this->drupalGet('form-test/group-details');
 
     // Check #description default placement.
     $field_id = 'edit-meta';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//details[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]//div/preceding-sibling::div');
-    $this->assertTrue(isset($elements[0]), t('Properly places by default the #description element before the form item within details group.'));
+    $this->assertTrue(isset($elements[0]), 'Properly places by default the #description element before the form item within details group.');
 
     // Check #description placement with #description_display='before'.
     $field_id = 'edit-details-before';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//details[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]//div[@id="edit-meta-before"]/preceding-sibling::div[@id="' . $description_id . '"]');
-    $this->assertTrue(isset($elements[0]), t('Properly places the #description element before the form item within details group.'));
+    $this->assertTrue(isset($elements[0]), 'Properly places the #description element before the form item within details group.');
 
     // Check #description placement with #description_display='after'.
     $field_id = 'edit-details-after';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//details[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]//div[@id="edit-meta-after"]/following-sibling::div[@id="' . $description_id . '"]');
-    $this->assertTrue(isset($elements[0]), t('Properly places the #description element after the form item within details group.'));
+    $this->assertTrue(isset($elements[0]), 'Properly places the #description element after the form item within details group.');
 
     // Check if the class is 'visually-hidden' on the form details description
     // for the option with #description_display='invisible' and also check that
@@ -53,6 +53,7 @@ function testFieldsetDescriptions() {
     $field_id = 'edit-details-invisible';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//details[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]//div[@id="edit-meta-invisible"]/following-sibling::div[contains(@class, "visually-hidden")]');
-    $this->assertTrue(isset($elements[0]), t('Properly renders the #description element visually-hidden within details group.'));
+    $this->assertTrue(isset($elements[0]), 'Properly renders the #description element visually-hidden within details group.');
   }
+
 }
diff --git a/core/modules/system/src/Tests/Form/ElementsLabelsTest.php b/core/modules/system/src/Tests/Form/ElementsLabelsTest.php
index ed42b8d..84361af 100644
--- a/core/modules/system/src/Tests/Form/ElementsLabelsTest.php
+++ b/core/modules/system/src/Tests/Form/ElementsLabelsTest.php
@@ -106,19 +106,19 @@ function testFormDescriptions() {
     $field_id = 'edit-form-textfield-test-description-default';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/following-sibling::div[@id="' . $description_id . '"]');
-    $this->assertTrue(isset($elements[0]), t('Properly places by default the #description element after the form item.'));
+    $this->assertTrue(isset($elements[0]), 'Properly places by default the #description element after the form item.');
 
     // Check #description placement with #description_display='after'.
     $field_id = 'edit-form-textfield-test-description-after';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/following-sibling::div[@id="' . $description_id . '"]');
-    $this->assertTrue(isset($elements[0]), t('Properly places the #description element after the form item.'));
+    $this->assertTrue(isset($elements[0]), 'Properly places the #description element after the form item.');
 
     // Check #description placement with #description_display='before'.
     $field_id = 'edit-form-textfield-test-description-before';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/preceding-sibling::div[@id="' . $description_id . '"]');
-    $this->assertTrue(isset($elements[0]), t('Properly places the #description element before the form item.'));
+    $this->assertTrue(isset($elements[0]), 'Properly places the #description element before the form item.');
 
     // Check if the class is 'visually-hidden' on the form element description
     // for the option with #description_display='invisible' and also check that
@@ -126,7 +126,7 @@ function testFormDescriptions() {
     $field_id = 'edit-form-textfield-test-description-invisible';
     $description_id = $field_id . '--description';
     $elements = $this->xpath('//input[@id="' . $field_id . '" and @aria-describedby="' . $description_id . '"]/following-sibling::div[contains(@class, "visually-hidden")]');
-    $this->assertTrue(isset($elements[0]), t('Properly renders the #description element visually-hidden.'));
+    $this->assertTrue(isset($elements[0]), 'Properly renders the #description element visually-hidden.');
   }
 
 }