diff --git a/core/core.services.yml b/core/core.services.yml
index 14c665c..5619213 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -290,10 +290,13 @@ services:
     arguments: ['@form_validator', '@form_submitter', '@form_cache', '@module_handler', '@event_dispatcher', '@request_stack', '@class_resolver', '@theme.manager', '@?csrf_token']
   form_validator:
     class: Drupal\Core\Form\FormValidator
-    arguments: ['@request_stack', '@string_translation', '@csrf_token', '@logger.channel.form']
+    arguments: ['@request_stack', '@string_translation', '@csrf_token', '@logger.channel.form', '@form_error_handler']
   form_submitter:
     class: Drupal\Core\Form\FormSubmitter
     arguments: ['@request_stack', '@url_generator']
+  form_error_handler:
+    class: Drupal\Core\Form\FormErrorHandler
+    arguments: ['@string_translation', '@link_generator']
   form_cache:
     class: Drupal\Core\Form\FormCache
     arguments: ['@app.root', '@keyvalue.expirable', '@module_handler', '@current_user', '@csrf_token', '@logger.channel.form', '@config.factory', '@request_stack', '@page_cache_request_policy']
diff --git a/core/includes/form.inc b/core/includes/form.inc
index 44a049c..95b8204 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -11,6 +11,7 @@
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Database\Database;
 use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Form\FormElementHelper;
 use Drupal\Core\Form\OptGroup;
 use Drupal\Core\Render\Element;
 use Drupal\Core\Template\Attribute;
@@ -215,6 +216,12 @@ function template_preprocess_fieldset(&$variables) {
     // Add the description's id to the fieldset aria attributes.
     $variables['attributes']['aria-describedby'] = $description_id;
   }
+
+  // Display any error messages.
+  $variables['errors'] = NULL;
+  if (!empty($element['#errors']) && empty($element['#error_use_parent'])) {
+    $variables['errors'] = $element['#errors'];
+  }
 }
 
 /**
@@ -425,7 +432,7 @@ function template_preprocess_form_element(&$variables) {
     $variables['attributes'] = $element['#wrapper_attributes'];
   }
 
-  // Add element #id for #type 'item'.
+  // Add element #id for #type 'item' and 'password_confirm'.
   if (isset($element['#markup']) && !empty($element['#id'])) {
     $variables['attributes']['id'] = $element['#id'];
   }
@@ -441,6 +448,12 @@ function template_preprocess_form_element(&$variables) {
   // Pass elements disabled status to template.
   $variables['disabled'] = !empty($element['#attributes']['disabled']) ? $element['#attributes']['disabled'] : NULL;
 
+  // Display any error messages.
+  $variables['errors'] = NULL;
+  if (!empty($element['#errors']) && empty($element['#error_use_parent'])) {
+    $variables['errors'] = $element['#errors'];
+  }
+
   // If #title is not set, we don't display any label.
   if (!isset($element['#title'])) {
     $element['#title_display'] = 'none';
diff --git a/core/lib/Drupal/Core/Form/FormElementHelper.php b/core/lib/Drupal/Core/Form/FormElementHelper.php
new file mode 100644
index 0000000..9d3e193
--- /dev/null
+++ b/core/lib/Drupal/Core/Form/FormElementHelper.php
@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Form\FormElementHelper.
+ */
+
+namespace Drupal\Core\Form;
+
+use Drupal\Core\Render\Element;
+
+/**
+ * Provides common functionality for form elements.
+ */
+class FormElementHelper {
+
+  /**
+   * Retrieves a form element.
+   *
+   * @param string $name
+   *   The name of the form element. If the #parents property of your form
+   *   element is ['foo', 'bar', 'baz'] then the name is 'foo][bar][baz'.
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   *
+   * @return array
+   *   The form element.
+   */
+  public static function getElementByName($name, array $form) {
+    foreach (Element::children($form) as $key) {
+      if ($key === $name) {
+        return $form[$key];
+      }
+      elseif ($element = static::getElementByName($name, $form[$key])) {
+        return $element;
+      }
+    }
+    return [];
+  }
+
+  /**
+   * Returns the title for the element.
+   *
+   * If the element has no title, this will recurse through all children of the
+   * element until a title is found.
+   *
+   * @param array $element
+   *   An associative array containing the properties of the form element.
+   *
+   * @return string
+   *   The title of the element, or an empty string if none is found.
+   */
+  public static function getElementTitle(array $element) {
+    $title = '';
+    if (isset($element['#title'])) {
+      $title = $element['#title'];
+    }
+    else {
+      foreach (Element::children($element) as $key) {
+        if ($title = static::getElementTitle($element[$key])) {
+          break;
+        }
+      }
+    }
+    return $title;
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Form/FormErrorHandler.php b/core/lib/Drupal/Core/Form/FormErrorHandler.php
new file mode 100644
index 0000000..e2b3090
--- /dev/null
+++ b/core/lib/Drupal/Core/Form/FormErrorHandler.php
@@ -0,0 +1,121 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Form\FormErrorHandler.
+ */
+
+namespace Drupal\Core\Form;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Core\Render\Element;
+use Drupal\Core\Routing\LinkGeneratorTrait;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\StringTranslation\TranslationInterface;
+use Drupal\Core\Url;
+use Drupal\Core\Utility\LinkGeneratorInterface;
+
+/**
+ * Handles form errors.
+ */
+class FormErrorHandler implements FormErrorHandlerInterface {
+
+  use StringTranslationTrait;
+  use LinkGeneratorTrait;
+
+  /**
+   * Constructs a new FormErrorHandler.
+   *
+   * @param \Drupal\Core\StringTranslation\TranslationInterface $string_translation
+   *   The string translation service.
+   * @param \Drupal\Core\Utility\LinkGeneratorInterface $link_generator
+   *   The link generation service.
+   */
+  public function __construct(TranslationInterface $string_translation, LinkGeneratorInterface $link_generator) {
+    $this->stringTranslation = $string_translation;
+    $this->linkGenerator = $link_generator;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function handleFormErrors(array &$form, FormStateInterface $form_state) {
+    // Display error messages for each element.
+    $this->displayErrorMessages($form, $form_state);
+
+    // After validation, loop through and assign each element its errors.
+    $this->setElementErrorsFromFormState($form, $form_state);
+
+    return $this;
+  }
+
+  /**
+   * Loops through and displays all form errors.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   */
+  protected function displayErrorMessages(array $form, FormStateInterface $form_state) {
+    $error_links = [];
+    // Loop through all form errors and display a link for each error that is
+    // associated with a visible form element.
+    foreach ($form_state->getErrors() as $key => $error) {
+      if (($form_element = FormElementHelper::getElementByName($key, $form)) && Element::isVisibleElement($form_element)) {
+        $title = FormElementHelper::getElementTitle($form_element);
+        $error_links[] = $this->l($title, Url::fromRoute('<none>', [], ['fragment' => 'edit-' . str_replace('_', '-', $key), 'external' => TRUE]));
+      }
+      else {
+        $this->drupalSetMessage($error, 'error');
+      }
+    }
+
+    if (!empty($error_links)) {
+      // We need to pass this through SafeMarkup::format() so
+      // drupal_set_message() does not encode the links.
+      $message_error_links = '';
+      $separator = '';
+      foreach ($error_links as $error_link) {
+        $message_error_links .= $separator . SafeMarkup::escape($error_link);
+        $separator = ', ';
+      }
+      $message = $this->formatPlural(count($error_links), '1 error has been found: !errors', '@count errors have been found: !errors', [
+        '!errors' => SafeMarkup::set($message_error_links),
+      ]);
+      $this->drupalSetMessage($message, 'error');
+    }
+  }
+
+  /**
+   * Stores the errors of each element directly on the element.
+   *
+   * We must provide a way for non-form functions to check the errors for a
+   * specific element. The most common usage of this is a #pre_render callback.
+   *
+   * @param array $elements
+   *   An associative array containing the structure of a form element.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   */
+  protected function setElementErrorsFromFormState(array &$elements, FormStateInterface &$form_state) {
+    // Recurse through all children.
+    foreach (Element::children($elements) as $key) {
+      if (isset($elements[$key]) && $elements[$key]) {
+        $this->setElementErrorsFromFormState($elements[$key], $form_state);
+      }
+    }
+    // Store the errors for this element on the element directly.
+    $elements['#errors'] = $form_state->getError($elements);
+  }
+
+  /**
+   * Wraps drupal_set_message().
+   *
+   * @codeCoverageIgnore
+   */
+  protected function drupalSetMessage($message = NULL, $type = 'status', $repeat = FALSE) {
+    drupal_set_message($message, $type, $repeat);
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Form/FormErrorHandlerInterface.php b/core/lib/Drupal/Core/Form/FormErrorHandlerInterface.php
new file mode 100644
index 0000000..161505f
--- /dev/null
+++ b/core/lib/Drupal/Core/Form/FormErrorHandlerInterface.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Form\FormErrorHandlerInterface.
+ */
+
+namespace Drupal\Core\Form;
+
+/**
+ * Provides an interface for handling form errors.
+ */
+interface FormErrorHandlerInterface {
+
+  /**
+   * Handles form errors after form validation.
+   *
+   * @param array $form
+   *   An associative array containing the structure of the form.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The current state of the form.
+   *
+   * @return $this
+   */
+  public function handleFormErrors(array &$form, FormStateInterface $form_state);
+
+}
diff --git a/core/lib/Drupal/Core/Form/FormState.php b/core/lib/Drupal/Core/Form/FormState.php
index 9d651cd..1cfa0b7 100644
--- a/core/lib/Drupal/Core/Form/FormState.php
+++ b/core/lib/Drupal/Core/Form/FormState.php
@@ -1090,9 +1090,6 @@ public function setErrorByName($name, $message = '') {
         $errors[$name] = $message;
         $this->errors = $errors;
         static::setAnyErrors();
-        if ($message) {
-          $this->drupalSetMessage($message, 'error');
-        }
       }
     }
 
@@ -1245,15 +1242,6 @@ public function cleanValues() {
   }
 
   /**
-   * Wraps drupal_set_message().
-   *
-   * @return array|null
-   */
-  protected function drupalSetMessage($message = NULL, $type = 'status', $repeat = FALSE) {
-    return drupal_set_message($message, $type, $repeat);
-  }
-
-  /**
    * Wraps ModuleHandler::loadInclude().
    */
   protected function moduleLoadInclude($module, $type, $name = NULL) {
diff --git a/core/lib/Drupal/Core/Form/FormValidator.php b/core/lib/Drupal/Core/Form/FormValidator.php
index ee2da65..96f2320 100644
--- a/core/lib/Drupal/Core/Form/FormValidator.php
+++ b/core/lib/Drupal/Core/Form/FormValidator.php
@@ -45,6 +45,13 @@ class FormValidator implements FormValidatorInterface {
   protected $logger;
 
   /**
+   * The form error handler.
+   *
+   * @var \Drupal\Core\Form\FormErrorHandlerInterface
+   */
+  protected $formErrorHandler;
+
+  /**
    * Constructs a new FormValidator.
    *
    * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
@@ -55,12 +62,15 @@ class FormValidator implements FormValidatorInterface {
    *   The CSRF token generator.
    * @param \Psr\Log\LoggerInterface $logger
    *   A logger instance.
+   * @param \Drupal\Core\Form\FormErrorHandlerInterface $form_error_handler
+   *   The form error handler.
    */
-  public function __construct(RequestStack $request_stack, TranslationInterface $string_translation, CsrfTokenGenerator $csrf_token, LoggerInterface $logger) {
+  public function __construct(RequestStack $request_stack, TranslationInterface $string_translation, CsrfTokenGenerator $csrf_token, LoggerInterface $logger, FormErrorHandlerInterface $form_error_handler) {
     $this->requestStack = $request_stack;
     $this->stringTranslation = $string_translation;
     $this->csrfToken = $csrf_token;
     $this->logger = $logger;
+    $this->formErrorHandler = $form_error_handler;
   }
 
   /**
@@ -184,8 +194,9 @@ protected function handleErrorsWithLimitedValidation(&$form, FormStateInterface
    *   The unique string identifying the form.
    */
   protected function finalizeValidation(&$form, FormStateInterface &$form_state, $form_id) {
-    // After validation, loop through and assign each element its errors.
-    $this->setElementErrorsFromFormState($form, $form_state);
+    // Delegate handling of form errors to a service.
+    $this->formErrorHandler->handleFormErrors($form, $form_state);
+
     // Mark this form as validated.
     $form_state->setValidationComplete();
   }
@@ -394,26 +405,4 @@ protected function determineLimitValidationErrors(FormStateInterface &$form_stat
     }
   }
 
-  /**
-   * Stores the errors of each element directly on the element.
-   *
-   * We must provide a way for non-form functions to check the errors for a
-   * specific element. The most common usage of this is a #pre_render callback.
-   *
-   * @param array $elements
-   *   An associative array containing the structure of a form element.
-   * @param \Drupal\Core\Form\FormStateInterface $form_state
-   *   The current state of the form.
-   */
-  protected function setElementErrorsFromFormState(array &$elements, FormStateInterface &$form_state) {
-    // Recurse through all children.
-    foreach (Element::children($elements) as $key) {
-      if (isset($elements[$key]) && $elements[$key]) {
-        $this->setElementErrorsFromFormState($elements[$key], $form_state);
-      }
-    }
-    // Store the errors for this element on the element directly.
-    $elements['#errors'] = $form_state->getError($elements);
-  }
-
 }
diff --git a/core/lib/Drupal/Core/Render/Element.php b/core/lib/Drupal/Core/Render/Element.php
index f268a01..e34e002 100644
--- a/core/lib/Drupal/Core/Render/Element.php
+++ b/core/lib/Drupal/Core/Render/Element.php
@@ -131,7 +131,7 @@ public static function getVisibleChildren(array $elements) {
       }
 
       // Skip value and hidden elements, since they are not rendered.
-      if (isset($child['#type']) && in_array($child['#type'], array('value', 'hidden'))) {
+      if (!static::isVisibleElement($child)) {
         continue;
       }
 
@@ -142,6 +142,19 @@ public static function getVisibleChildren(array $elements) {
   }
 
   /**
+   * Determines if an element is visible.
+   *
+   * @param array $element
+   *   The element to check for visibility.
+   *
+   * @return bool
+   *   TRUE if the element is visible, otherwise FALSE.
+   */
+  public static function isVisibleElement($element) {
+    return !isset($element['#type']) || !in_array($element['#type'], ['value', 'hidden', 'token']);
+  }
+
+  /**
    * Sets HTML attributes based on element properties.
    *
    * @param array $element
diff --git a/core/lib/Drupal/Core/Render/Element/Checkboxes.php b/core/lib/Drupal/Core/Render/Element/Checkboxes.php
index 1891ceb..f3a2872 100644
--- a/core/lib/Drupal/Core/Render/Element/Checkboxes.php
+++ b/core/lib/Drupal/Core/Render/Element/Checkboxes.php
@@ -74,6 +74,8 @@ public static function processCheckboxes(&$element, FormStateInterface $form_sta
           '#default_value' => isset($value[$key]) ? $key : NULL,
           '#attributes' => $element['#attributes'],
           '#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
+          // Errors should only be shown on the parent checkboxes element.
+          '#error_use_parent' => TRUE,
           '#weight' => $weight,
         );
       }
diff --git a/core/lib/Drupal/Core/Render/Element/PasswordConfirm.php b/core/lib/Drupal/Core/Render/Element/PasswordConfirm.php
index 9bc32b7..dcdf5a8 100644
--- a/core/lib/Drupal/Core/Render/Element/PasswordConfirm.php
+++ b/core/lib/Drupal/Core/Render/Element/PasswordConfirm.php
@@ -26,6 +26,7 @@ public function getInfo() {
     $class = get_class($this);
     return array(
       '#input' => TRUE,
+      '#markup' => '',
       '#process' => array(
         array($class, 'processPasswordConfirm'),
       ),
@@ -53,6 +54,7 @@ public static function processPasswordConfirm(&$element, FormStateInterface $for
       '#value' => empty($element['#value']) ? NULL : $element['#value']['pass1'],
       '#required' => $element['#required'],
       '#attributes' => array('class' => array('password-field')),
+      '#error_use_parent' => TRUE,
     );
     $element['pass2'] =  array(
       '#type' => 'password',
@@ -60,9 +62,11 @@ public static function processPasswordConfirm(&$element, FormStateInterface $for
       '#value' => empty($element['#value']) ? NULL : $element['#value']['pass2'],
       '#required' => $element['#required'],
       '#attributes' => array('class' => array('password-confirm')),
+      '#error_use_parent' => TRUE,
     );
     $element['#element_validate'] = array(array(get_called_class(), 'validatePasswordConfirm'));
     $element['#tree'] = TRUE;
+    $element['#theme_wrappers'] = ['fieldset'];
 
     if (isset($element['#size'])) {
       $element['pass1']['#size'] = $element['pass2']['#size'] = $element['#size'];
diff --git a/core/lib/Drupal/Core/Render/Element/Radios.php b/core/lib/Drupal/Core/Render/Element/Radios.php
index 4b27b5a..ac9c563 100644
--- a/core/lib/Drupal/Core/Render/Element/Radios.php
+++ b/core/lib/Drupal/Core/Render/Element/Radios.php
@@ -68,6 +68,8 @@ public static function processRadios(&$element, FormStateInterface $form_state,
           '#parents' => $element['#parents'],
           '#id' => HtmlUtility::getUniqueId('edit-' . implode('-', $parents_for_id)),
           '#ajax' => isset($element['#ajax']) ? $element['#ajax'] : NULL,
+          // Errors should only be shown on the parent radios element.
+          '#error_use_parent' => TRUE,
           '#weight' => $weight,
         );
       }
diff --git a/core/modules/shortcut/src/Tests/ShortcutSetsTest.php b/core/modules/shortcut/src/Tests/ShortcutSetsTest.php
index 417e918..151c0a0 100644
--- a/core/modules/shortcut/src/Tests/ShortcutSetsTest.php
+++ b/core/modules/shortcut/src/Tests/ShortcutSetsTest.php
@@ -131,7 +131,9 @@ function testShortcutSetSwitchCreate() {
   function testShortcutSetSwitchNoSetName() {
     $edit = array('set' => 'new');
     $this->drupalPostForm('user/' . $this->adminUser->id() . '/shortcuts', $edit, t('Change set'));
-    $this->assertText(t('The new set label is required.'));
+    $this->assertRaw(\Drupal::translation()->formatPlural(1, '1 error has been found: !errors', '@count errors have been found: !errors', [
+      '!errors' => SafeMarkup::set('<a href="#edit-new">New set</a>')
+    ]));
     $current_set = shortcut_current_displayed_set($this->adminUser);
     $this->assertEqual($current_set->id(), $this->set->id(), 'Attempting to switch to a new shortcut set without providing a set name does not succeed.');
   }
diff --git a/core/modules/system/css/system.theme.css b/core/modules/system/css/system.theme.css
index f7af1e4..7a8d8d5 100644
--- a/core/modules/system/css/system.theme.css
+++ b/core/modules/system/css/system.theme.css
@@ -113,6 +113,17 @@ abbr.ajax-changed {
   margin-right: 0;
 }
 
+/* Inline error messages. */
+.form-error-message:before {
+  content: '';
+  display: inline-block;
+  height: 14px;
+  width: 14px;
+  vertical-align: sub;
+  background: url(../../../misc/icons/ea2800/error.svg) no-repeat;
+  background-size: contain;
+}
+
 /**
  * Inline items.
  */
@@ -549,6 +560,7 @@ ul.tabs {
   background-image: url(../../../misc/icons/ea2800/error.svg);
   border-color: #f9c9bf #f9c9bf #f9c9bf transparent;  /* LTR */
   box-shadow: -8px 0 0 #e62600; /* LTR */
+  margin-left: 8px;
 }
 [dir="rtl"] .messages--error {
   border-color: #f9c9bf transparent #f9c9bf #f9c9bf;
diff --git a/core/modules/system/src/Tests/Form/FormTest.php b/core/modules/system/src/Tests/Form/FormTest.php
index 5a43f49..5132b70 100644
--- a/core/modules/system/src/Tests/Form/FormTest.php
+++ b/core/modules/system/src/Tests/Form/FormTest.php
@@ -188,7 +188,7 @@ function testRequiredCheckboxesRadio() {
     }
 
     // Check the page for error messages.
-    $errors = $this->xpath('//div[contains(@class, "error")]//li');
+    $errors = $this->xpath('//div[contains(@class, "form-error-message")]//strong');
     foreach ($errors as $error) {
       $expected_key = array_search($error[0], $expected);
       // If the error message is not one of the expected messages, fail.
@@ -533,7 +533,7 @@ function testDisabledElements() {
     // All the elements should be marked as disabled, including the ones below
     // the disabled container.
     $actual_count = count($disabled_elements);
-    $expected_count = 41;
+    $expected_count = 42;
     $this->assertEqual($actual_count, $expected_count, SafeMarkup::format('Found @actual elements with disabled property (expected @expected).', array(
       '@actual' => count($disabled_elements),
       '@expected' => $expected_count,
diff --git a/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php b/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php
index ae6b82c..f7cffa1 100644
--- a/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php
+++ b/core/modules/system/src/Tests/Form/TriggeringElementProgrammedUnitTest.php
@@ -19,11 +19,23 @@
  */
 class TriggeringElementProgrammedUnitTest extends KernelTestBase implements FormInterface {
 
+  /**
+   * {@inheritdoc}
+   */
   public static $modules = array('system');
 
   /**
    * {@inheritdoc}
    */
+  protected function setUp() {
+    parent::setUp();
+    $this->installSchema('system', ['router']);
+    \Drupal::service('router.builder')->rebuild();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public function getFormId() {
     return 'triggering_element_programmed_form';
   }
diff --git a/core/modules/system/src/Tests/Form/ValidationTest.php b/core/modules/system/src/Tests/Form/ValidationTest.php
index 7b6c9e8..e145b72 100644
--- a/core/modules/system/src/Tests/Form/ValidationTest.php
+++ b/core/modules/system/src/Tests/Form/ValidationTest.php
@@ -8,6 +8,7 @@
 namespace Drupal\system\Tests\Form;
 
 use Drupal\Core\Render\Element;
+use Drupal\Core\Url;
 use Drupal\simpletest\WebTestBase;
 
 /**
@@ -206,17 +207,34 @@ function testCustomRequiredError() {
     $edit = array();
     $this->drupalPostForm('form-test/validate-required', $edit, 'Submit');
 
+    $messages = [];
     foreach (Element::children($form) as $key) {
       if (isset($form[$key]['#required_error'])) {
         $this->assertNoText(t('!name field is required.', array('!name' => $form[$key]['#title'])));
-        $this->assertText($form[$key]['#required_error']);
+        $messages[] = [
+          'title' => $form[$key]['#title'],
+          'message' => $form[$key]['#required_error'],
+          'key' => $key,
+        ];
       }
       elseif (isset($form[$key]['#form_test_required_error'])) {
         $this->assertNoText(t('!name field is required.', array('!name' => $form[$key]['#title'])));
-        $this->assertText($form[$key]['#form_test_required_error']);
+        $messages[] = [
+          'title' => $form[$key]['#title'],
+          'message' => $form[$key]['#form_test_required_error'],
+          'key' => $key,
+        ];
+      }
+      elseif (!empty($form[$key]['#required'])) {
+        $messages[] = [
+          'title' => $form[$key]['#title'],
+          'message' => t('!name field is required.', ['!name' => $form[$key]['#title']]),
+          'key' => $key,
+        ];
       }
     }
-    $this->assertNoText(t('An illegal choice has been detected. Please contact the site administrator.'));
+    $this->assertErrorMessages($messages);
+
 
     // Verify that no custom validation error appears with valid values.
     $edit = array(
@@ -226,6 +244,7 @@ function testCustomRequiredError() {
     );
     $this->drupalPostForm('form-test/validate-required', $edit, 'Submit');
 
+    $messages = [];
     foreach (Element::children($form) as $key) {
       if (isset($form[$key]['#required_error'])) {
         $this->assertNoText(t('!name field is required.', array('!name' => $form[$key]['#title'])));
@@ -235,7 +254,49 @@ function testCustomRequiredError() {
         $this->assertNoText(t('!name field is required.', array('!name' => $form[$key]['#title'])));
         $this->assertNoText($form[$key]['#form_test_required_error']);
       }
+      elseif (!empty($form[$key]['#required'])) {
+        $messages[] = [
+          'title' => $form[$key]['#title'],
+          'message' => t('!name field is required.', ['!name' => $form[$key]['#title']]),
+          'key' => $key,
+        ];
+      }
     }
+    $this->assertErrorMessages($messages);
+  }
+
+  /**
+   * Asserts that the given error messages are displayed.
+   *
+   * @param array $messages
+   *   An associative array of error messages keyed by the order they appear on
+   *   the page, with the following key-value pairs:
+   *   - title: The human readable form element title.
+   *   - message: The error message for this form element.
+   *   - key: The key used for the form element.
+   */
+  protected function assertErrorMessages($messages) {
+    $element = $this->xpath('//div[@class = "form-error-message"]/strong');
+    $this->assertIdentical(count($messages), count($element));
+
+    $error_links = [];
+    foreach ($messages as $delta => $message) {
+      // Ensure the message appears in the correct place.
+      if (!isset($element[$delta])) {
+        $this->fail(format_string('The error message for the "@title" element with key "@key" was not found.', ['@title' => $message['title'], '@key' => $message['key']]));
+      }
+      else {
+        $this->assertIdentical($message['message'], (string) $element[$delta]);
+      }
+
+      // Gather the element for checking the jump link section.
+      $error_links[] = \Drupal::l($message['title'], Url::fromRoute('<none>', [], ['fragment' => 'edit-' . str_replace('_', '-', $message['key']), 'external' => TRUE]));
+    }
+    $top_message = \Drupal::translation()->formatPlural(count($error_links), '1 error has been found: !errors', '@count errors have been found: !errors', [
+      '!errors' => SafeMarkup::set(implode(', ', $error_links))
+    ]);
+    $this->assertRaw($top_message);
     $this->assertNoText(t('An illegal choice has been detected. Please contact the site administrator.'));
   }
+
 }
diff --git a/core/modules/system/templates/fieldset.html.twig b/core/modules/system/templates/fieldset.html.twig
index ab6796c..cf4e6fa 100644
--- a/core/modules/system/templates/fieldset.html.twig
+++ b/core/modules/system/templates/fieldset.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables:
  * - attributes: HTML attributes for the fieldset element.
+ * - errors: (optional) Any errors for this fieldset element, may not be set.
  * - required: Boolean indicating whether the fieldeset element is required.
  * - legend: The legend element containing the following properties:
  *   - title: Title of the fieldset, intended for use as the text of the legend.
@@ -22,6 +23,11 @@
  */
 #}
 <fieldset{{ attributes.addClass('form-item', 'form-wrapper') }}>
+  {% if errors %}
+    <div class="form-error-message">
+      <strong>{{ errors }}</strong>
+    </div>
+  {% endif %}
   {%
     set legend_span_classes = [
       'fieldset-legend',
diff --git a/core/modules/system/templates/form-element.html.twig b/core/modules/system/templates/form-element.html.twig
index a961801..f9148c8 100644
--- a/core/modules/system/templates/form-element.html.twig
+++ b/core/modules/system/templates/form-element.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables:
  * - attributes: HTML attributes for the containing element.
+ * - errors: (optional) Any errors for this form element, may not be set.
  * - prefix: (optional) The form element prefix, may not be set.
  * - suffix: (optional) The form element suffix, may not be set.
  * - required: The required marker, or empty if the associated form element is
@@ -52,6 +53,7 @@
     'form-item-' ~ name|clean_class,
     title_display not in ['after', 'before'] ? 'form-no-label',
     disabled == 'disabled' ? 'form-disabled',
+    errors ? 'form-error',
   ]
 %}
 {%
@@ -61,6 +63,11 @@
   ]
 %}
 <div{{ attributes.addClass(classes) }}>
+  {% if errors %}
+    <div class="form-error-message">
+      <strong>{{ errors }}</strong>
+    </div>
+  {% endif %}
   {% if label_display in ['before', 'invisible'] %}
     {{ label }}
   {% endif %}
diff --git a/core/modules/user/src/Tests/UserBlocksTest.php b/core/modules/user/src/Tests/UserBlocksTest.php
index 1349264..2a46671 100644
--- a/core/modules/user/src/Tests/UserBlocksTest.php
+++ b/core/modules/user/src/Tests/UserBlocksTest.php
@@ -43,6 +43,16 @@ protected function setUp() {
    * Test the user login block.
    */
   function testUserLoginBlock() {
+    // Make sure the validation error is displayed when try to login with
+    // invalid username/password.
+    $edit['name'] = $this->randomMachineName();
+    $edit['pass'] = $this->randomMachineName();
+    $this->drupalPostForm('node', $edit, t('Log in'));
+    $this->assertRaw(\Drupal::translation()->formatPlural(1, '1 error has been found: !errors', '@count errors have been found: !errors', [
+      '!errors' => SafeMarkup::set('<a href="#edit-name">Username</a>')
+    ]));
+    $this->assertText(t('Sorry, unrecognized username or password.'));
+
     // Create a user with some permission that anonymous users lack.
     $user = $this->drupalCreateUser(array('administer permissions'));
 
diff --git a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
index ce7bfee..85d9702 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormBuilderTest.php
@@ -370,15 +370,11 @@ public function testUniqueHtmlId() {
       ->method('buildForm')
       ->will($this->returnValue($expected_form));
 
-    $form_state = $this->getMockBuilder('Drupal\Core\Form\FormState')
-      ->setMethods(array('drupalSetMessage'))
-      ->getMock();
+    $form_state = new FormState();
     $form = $this->simulateFormSubmission($form_id, $form_arg, $form_state);
     $this->assertSame('test-form-id', $form['#id']);
 
-    $form_state = $this->getMockBuilder('Drupal\Core\Form\FormState')
-      ->setMethods(array('drupalSetMessage'))
-      ->getMock();
+    $form_state = new FormState();
     $form = $this->simulateFormSubmission($form_id, $form_arg, $form_state);
     $this->assertSame('test-form-id--2', $form['#id']);
   }
diff --git a/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php b/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php
new file mode 100644
index 0000000..64b8705
--- /dev/null
+++ b/core/tests/Drupal/Tests/Core/Form/FormElementHelperTest.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Core\Form\FormBuilderTest.
+ */
+
+namespace Drupal\Tests\Core\Form;
+
+use Drupal\Core\Form\FormElementHelper;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * Tests the form element helper.
+ *
+ * @group Drupal
+ * @group Form
+ *
+ * @coversDefaultClass \Drupal\Core\Form\FormElementHelper
+ */
+class FormElementHelperTest extends UnitTestCase {
+
+  /**
+   * Tests the getElementByName() method.
+   *
+   * @covers ::getElementByName
+   *
+   * @dataProvider getElementByNameProvider
+   */
+  public function testGetElementByName($name, $form, $expected) {
+    $this->assertSame($expected, FormElementHelper::getElementByName($name, $form));
+  }
+
+  /**
+   * Provides test data.
+   */
+  public function getElementByNameProvider() {
+    return [
+      ['id', [], []],
+      ['id', ['id' => ['#title' => 'ID']], ['#title' => 'ID']],
+      ['id', ['fieldset' => ['id' => ['#title' => 'ID']]], ['#title' => 'ID']],
+      ['fieldset', ['fieldset' => ['id' => ['#title' => 'ID']]], ['id' => ['#title' => 'ID']]],
+    ];
+  }
+
+  /**
+   * Tests the getElementTitle() method.
+   *
+   * @covers ::getElementTitle
+   *
+   * @dataProvider getElementTitleProvider
+   */
+  public function testGetElementTitle($name, $form, $expected) {
+    $element = FormElementHelper::getElementByName($name, $form);
+    $this->assertSame($expected, FormElementHelper::getElementTitle($element));
+  }
+
+  /**
+   * Provides test data.
+   */
+  public function getElementTitleProvider() {
+    return [
+      ['id', [], ''],
+      ['id', ['id' => ['#title' => 'ID']], 'ID'],
+      ['id', ['fieldset' => ['id' => ['#title' => 'ID']]], 'ID'],
+      ['fieldset', ['fieldset' => ['id' => ['#title' => 'ID']]], 'ID'],
+    ];
+  }
+
+}
diff --git a/core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php b/core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php
new file mode 100644
index 0000000..2769506
--- /dev/null
+++ b/core/tests/Drupal/Tests/Core/Form/FormErrorHandlerTest.php
@@ -0,0 +1,85 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Core\Form\FormErrorHandlerTest.
+ */
+
+namespace Drupal\Tests\Core\Form;
+
+use Drupal\Core\Form\FormState;
+use Drupal\Tests\UnitTestCase;
+
+/**
+ * @coversDefaultClass \Drupal\Core\Form\FormErrorHandler
+ * @group Form
+ */
+class FormErrorHandlerTest extends UnitTestCase {
+
+  /**
+   * @covers ::handleFormErrors
+   * @covers ::displayErrorMessages
+   */
+  public function testDisplayErrorMessages() {
+    $link_generator = $this->getMock('Drupal\Core\Utility\LinkGeneratorInterface');
+    $link_generator->expects($this->any())
+      ->method('generate')
+      ->willReturnArgument(0);
+    $form_error_handler = $this->getMockBuilder('Drupal\Core\Form\FormErrorHandler')
+      ->setConstructorArgs([$this->getStringTranslationStub(), $link_generator])
+      ->setMethods(['drupalSetMessage'])
+      ->getMock();
+
+    $form_error_handler->expects($this->at(0))
+      ->method('drupalSetMessage')
+      ->with('this missing element is invalid', 'error');
+    $form_error_handler->expects($this->at(1))
+      ->method('drupalSetMessage')
+      ->with('2 errors have been found: Test 1, Test 2', 'error');
+
+    $form = [
+      '#parents' => [],
+    ];
+    $form['test1'] = [
+      '#type' => 'textfield',
+      '#title' => 'Test 1',
+      '#parents' => ['test1'],
+    ];
+    $form['test2'] = [
+      '#type' => 'textfield',
+      '#title' => 'Test 2',
+      '#parents' => ['test2'],
+    ];
+    $form_state = new FormState();
+    $form_state->setErrorByName('test1', 'invalid');
+    $form_state->setErrorByName('test2', 'invalid');
+    $form_state->setErrorByName('missing_element', 'this missing element is invalid');
+    $form_error_handler->handleFormErrors($form, $form_state);
+    $this->assertSame('invalid', $form['test1']['#errors']);
+  }
+
+  /**
+   * @covers ::handleFormErrors
+   * @covers ::setElementErrorsFromFormState
+   */
+  public function testSetElementErrorsFromFormState() {
+    $form_error_handler = $this->getMockBuilder('Drupal\Core\Form\FormErrorHandler')
+      ->setConstructorArgs([$this->getStringTranslationStub(), $this->getMock('Drupal\Core\Utility\LinkGeneratorInterface')])
+      ->setMethods(['drupalSetMessage'])
+      ->getMock();
+
+    $form = [
+      '#parents' => [],
+    ];
+    $form['test'] = [
+      '#type' => 'textfield',
+      '#title' => 'Test',
+      '#parents' => ['test'],
+    ];
+    $form_state = new FormState();
+    $form_state->setErrorByName('test', 'invalid');
+    $form_error_handler->handleFormErrors($form, $form_state);
+    $this->assertSame('invalid', $form['test']['#errors']);
+  }
+
+}
diff --git a/core/tests/Drupal/Tests/Core/Form/FormStateTest.php b/core/tests/Drupal/Tests/Core/Form/FormStateTest.php
index 24c4ddd..b662342 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormStateTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormStateTest.php
@@ -62,15 +62,10 @@ public function providerTestGetRedirect() {
    * @covers ::setError
    */
   public function testSetError() {
-    $form_state = $this->getMockBuilder('Drupal\Core\Form\FormState')
-      ->setMethods(array('drupalSetMessage'))
-      ->getMock();
-    $form_state->expects($this->once())
-      ->method('drupalSetMessage')
-      ->willReturn('Fail');
-
+    $form_state = new FormState();
     $element['#parents'] = array('foo', 'bar');
     $form_state->setError($element, 'Fail');
+    $this->assertSame(['foo][bar' => 'Fail'], $form_state->getErrors());
   }
 
   /**
@@ -108,14 +103,10 @@ public function providerTestGetError() {
    *
    * @dataProvider providerTestSetErrorByName
    */
-  public function testSetErrorByName($limit_validation_errors, $expected_errors, $set_message = FALSE) {
-    $form_state = $this->getMockBuilder('Drupal\Core\Form\FormState')
-      ->setMethods(array('drupalSetMessage'))
-      ->getMock();
+  public function testSetErrorByName($limit_validation_errors, $expected_errors) {
+    $form_state = new FormState();
     $form_state->setLimitValidationErrors($limit_validation_errors);
     $form_state->clearErrors();
-    $form_state->expects($set_message ? $this->once() : $this->never())
-      ->method('drupalSetMessage');
 
     $form_state->setErrorByName('test', 'Fail 1');
     $form_state->setErrorByName('test', 'Fail 2');
@@ -131,7 +122,7 @@ public function providerTestSetErrorByName() {
       array(array(array('options')), array('options' => '')),
       // Do not limit an validation, and, ensuring the first error is returned
       // for the 'test' element.
-      array(NULL, array('test' => 'Fail 1', 'options' => ''), TRUE),
+      array(NULL, array('test' => 'Fail 1', 'options' => '')),
       // Limit all validation.
       array(array(), array()),
     );
@@ -146,9 +137,7 @@ public function providerTestSetErrorByName() {
    * @expectedExceptionMessage Form errors cannot be set after form validation has finished.
    */
   public function testFormErrorsDuringSubmission() {
-    $form_state = $this->getMockBuilder('Drupal\Core\Form\FormState')
-      ->setMethods(array('drupalSetMessage'))
-      ->getMock();
+    $form_state = new FormState();
     $form_state->setValidationComplete();
     $form_state->setErrorByName('test', 'message');
   }
diff --git a/core/tests/Drupal/Tests/Core/Form/FormTestBase.php b/core/tests/Drupal/Tests/Core/Form/FormTestBase.php
index 3ad3d09..84b447c 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormTestBase.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormTestBase.php
@@ -152,9 +152,10 @@ protected function setUp() {
     $this->requestStack = new RequestStack();
     $this->requestStack->push($this->request);
     $this->logger = $this->getMock('Drupal\Core\Logger\LoggerChannelInterface');
+    $form_error_handler = $this->getMock('Drupal\Core\Form\FormErrorHandlerInterface');
     $this->formValidator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->setConstructorArgs(array($this->requestStack, $this->getStringTranslationStub(), $this->csrfToken, $this->logger))
-      ->setMethods(array('drupalSetMessage'))
+      ->setConstructorArgs([$this->requestStack, $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $form_error_handler])
+      ->setMethods(NULL)
       ->getMock();
     $this->formSubmitter = $this->getMockBuilder('Drupal\Core\Form\FormSubmitter')
       ->setConstructorArgs(array($this->requestStack, $this->urlGenerator))
diff --git a/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
index 5165c0c..d701991 100644
--- a/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
@@ -20,6 +20,39 @@
 class FormValidatorTest extends UnitTestCase {
 
   /**
+   * A logger instance.
+   *
+   * @var \Psr\Log\LoggerInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $logger;
+
+  /**
+   * The CSRF token generator to validate the form token.
+   *
+   * @var \Drupal\Core\Access\CsrfTokenGenerator|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $csrfToken;
+
+  /**
+   * The form error handler.
+   *
+   * @var \Drupal\Core\Form\FormErrorHandlerInterface|\PHPUnit_Framework_MockObject_MockObject
+   */
+  protected $formErrorHandler;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    $this->logger = $this->getMock('Psr\Log\LoggerInterface');
+    $this->csrfToken = $this->getMockBuilder('Drupal\Core\Access\CsrfTokenGenerator')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $this->formErrorHandler = $this->getMock('Drupal\Core\Form\FormErrorHandlerInterface');
+  }
+
+  /**
    * Tests the 'validation_complete' $form_state flag.
    *
    * @covers ::validateForm
@@ -27,7 +60,7 @@ class FormValidatorTest extends UnitTestCase {
    */
   public function testValidationComplete() {
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(NULL)
       ->getMock();
 
@@ -45,7 +78,7 @@ public function testValidationComplete() {
    */
   public function testPreventDuplicateValidation() {
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('doValidateForm'))
       ->getMock();
     $form_validator->expects($this->never())
@@ -65,18 +98,19 @@ public function testPreventDuplicateValidation() {
    */
   public function testMustValidate() {
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('doValidateForm'))
       ->getMock();
     $form_validator->expects($this->once())
       ->method('doValidateForm');
+    $this->formErrorHandler->expects($this->once())
+      ->method('handleFormErrors');
 
     $form = array();
     $form_state = (new FormState())
       ->setValidationComplete()
       ->setValidationEnforced();
     $form_validator->validateForm('test_form_id', $form, $form_state);
-    $this->assertArrayHasKey('#errors', $form);
   }
 
   /**
@@ -86,16 +120,12 @@ public function testValidateInvalidFormToken() {
     $request_stack = new RequestStack();
     $request = new Request(array(), array(), array(), array(), array(), array('REQUEST_URI' => '/test/example?foo=bar'));
     $request_stack->push($request);
-    $csrf_token = $this->getMockBuilder('Drupal\Core\Access\CsrfTokenGenerator')
-      ->disableOriginalConstructor()
-      ->getMock();
-    $csrf_token->expects($this->once())
+    $this->csrfToken->expects($this->once())
       ->method('validate')
       ->will($this->returnValue(FALSE));
-    $logger = $this->getMock('Psr\Log\LoggerInterface');
 
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->setConstructorArgs(array($request_stack, $this->getStringTranslationStub(), $csrf_token, $logger))
+      ->setConstructorArgs([$request_stack, $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('doValidateForm'))
       ->getMock();
     $form_validator->expects($this->never())
@@ -118,16 +148,12 @@ public function testValidateInvalidFormToken() {
    */
   public function testValidateValidFormToken() {
     $request_stack = new RequestStack();
-    $csrf_token = $this->getMockBuilder('Drupal\Core\Access\CsrfTokenGenerator')
-      ->disableOriginalConstructor()
-      ->getMock();
-    $csrf_token->expects($this->once())
+    $this->csrfToken->expects($this->once())
       ->method('validate')
       ->will($this->returnValue(TRUE));
-    $logger = $this->getMock('Psr\Log\LoggerInterface');
 
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->setConstructorArgs(array($request_stack, $this->getStringTranslationStub(), $csrf_token, $logger))
+      ->setConstructorArgs([$request_stack, $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('doValidateForm'))
       ->getMock();
     $form_validator->expects($this->once())
@@ -145,38 +171,13 @@ public function testValidateValidFormToken() {
   }
 
   /**
-   * @covers ::setElementErrorsFromFormState
-   */
-  public function testSetElementErrorsFromFormState() {
-    $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
-      ->setMethods(NULL)
-      ->getMock();
-
-    $form = array(
-      '#parents' => array(),
-    );
-    $form['test'] = array(
-      '#type' => 'textfield',
-      '#title' => 'Test',
-      '#parents' => array('test'),
-    );
-    $form_state = $this->getMockBuilder('Drupal\Core\Form\FormState')
-      ->setMethods(array('drupalSetMessage'))
-      ->getMock();
-    $form_state->setErrorByName('test', 'invalid');
-    $form_validator->validateForm('test_form_id', $form, $form_state);
-    $this->assertSame('invalid', $form['test']['#errors']);
-  }
-
-  /**
    * @covers ::handleErrorsWithLimitedValidation
    *
    * @dataProvider providerTestHandleErrorsWithLimitedValidation
    */
   public function testHandleErrorsWithLimitedValidation($sections, $triggering_element, $values, $expected) {
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(NULL)
       ->getMock();
 
@@ -272,7 +273,7 @@ public function providerTestHandleErrorsWithLimitedValidation() {
    */
   public function testExecuteValidateHandlers() {
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(NULL)
       ->getMock();
     $mock = $this->getMock('stdClass', array('validate_handler', 'hash_validate'));
@@ -302,13 +303,8 @@ public function testExecuteValidateHandlers() {
    * @dataProvider providerTestRequiredErrorMessage
    */
   public function testRequiredErrorMessage($element, $expected_message) {
-    $csrf_token = $this->getMockBuilder('Drupal\Core\Access\CsrfTokenGenerator')
-      ->disableOriginalConstructor()
-      ->getMock();
-    $logger = $this->getMock('Psr\Log\LoggerInterface');
-
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->setConstructorArgs(array(new RequestStack(), $this->getStringTranslationStub(), $csrf_token, $logger))
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('executeValidateHandlers'))
       ->getMock();
     $form_validator->expects($this->once())
@@ -356,7 +352,7 @@ public function providerTestRequiredErrorMessage() {
    */
   public function testElementValidate() {
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->disableOriginalConstructor()
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('executeValidateHandlers'))
       ->getMock();
     $form_validator->expects($this->once())
@@ -383,18 +379,13 @@ public function testElementValidate() {
    * @dataProvider providerTestPerformRequiredValidation
    */
   public function testPerformRequiredValidation($element, $expected_message, $call_watchdog) {
-    $csrf_token = $this->getMockBuilder('Drupal\Core\Access\CsrfTokenGenerator')
-      ->disableOriginalConstructor()
-      ->getMock();
-    $logger = $this->getMock('Psr\Log\LoggerInterface');
-
     $form_validator = $this->getMockBuilder('Drupal\Core\Form\FormValidator')
-      ->setConstructorArgs(array(new RequestStack(), $this->getStringTranslationStub(), $csrf_token, $logger))
+      ->setConstructorArgs([new RequestStack(), $this->getStringTranslationStub(), $this->csrfToken, $this->logger, $this->formErrorHandler])
       ->setMethods(array('setError'))
       ->getMock();
 
     if ($call_watchdog) {
-      $logger->expects($this->once())
+      $this->logger->expects($this->once())
         ->method('error')
         ->with($this->isType('string'), $this->isType('array'));
     }
diff --git a/core/tests/Drupal/Tests/UnitTestCase.php b/core/tests/Drupal/Tests/UnitTestCase.php
index c15bff2..ac42b8f 100644
--- a/core/tests/Drupal/Tests/UnitTestCase.php
+++ b/core/tests/Drupal/Tests/UnitTestCase.php
@@ -8,6 +8,7 @@
 namespace Drupal\Tests;
 
 use Drupal\Component\Utility\Random;
+use Drupal\Component\Utility\SafeMarkup;
 use Drupal\Core\Cache\CacheTagsInvalidatorInterface;
 use Drupal\Core\DependencyInjection\ContainerBuilder;
 
@@ -203,6 +204,11 @@ public function getStringTranslationStub() {
     $translation->expects($this->any())
       ->method('translate')
       ->will($this->returnCallback('Drupal\Component\Utility\SafeMarkup::format'));
+    $translation->expects($this->any())
+      ->method('formatPlural')
+      ->willReturnCallback(function ($count, $singular, $plural, array $args = [], array $options = []) {
+        return $count === 1 ? SafeMarkup::format($singular, $args) : SafeMarkup::format($plural, $args + ['@count' => $count]);
+      });
     return $translation;
   }
 
diff --git a/core/themes/classy/templates/form/fieldset.html.twig b/core/themes/classy/templates/form/fieldset.html.twig
index f7460cf..aa14b30 100644
--- a/core/themes/classy/templates/form/fieldset.html.twig
+++ b/core/themes/classy/templates/form/fieldset.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables:
  * - attributes: HTML attributes for the fieldset element.
+ * - errors: (optional) Any errors for this fieldset element, may not be set.
  * - required: Boolean indicating whether the fieldeset element is required.
  * - legend: The legend element containing the following properties:
  *   - title: Title of the fieldset, intended for use as the text of the legend.
@@ -20,6 +21,11 @@
  */
 #}
 <fieldset{{ attributes.addClass('form-item', 'form-wrapper') }}>
+  {% if errors %}
+    <div class="form-error-message">
+      <strong>{{ errors }}</strong>
+    </div>
+  {% endif %}
   {%
     set legend_span_classes = [
       'fieldset-legend',
diff --git a/core/themes/classy/templates/form/form-element.html.twig b/core/themes/classy/templates/form/form-element.html.twig
index cf54c20..d238ac5 100644
--- a/core/themes/classy/templates/form/form-element.html.twig
+++ b/core/themes/classy/templates/form/form-element.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables:
  * - attributes: HTML attributes for the containing element.
+ * - errors: (optional) Any errors for this form element, may not be set.
  * - prefix: (optional) The form element prefix, may not be set.
  * - suffix: (optional) The form element suffix, may not be set.
  * - required: The required marker, or empty if the associated form element is
@@ -50,6 +51,7 @@
     'form-item-' ~ name|clean_class,
     title_display not in ['after', 'before'] ? 'form-no-label',
     disabled == 'disabled' ? 'form-disabled',
+    errors ? 'form-error',
   ]
 %}
 {%
@@ -59,6 +61,11 @@
   ]
 %}
 <div{{ attributes.addClass(classes) }}>
+  {% if errors %}
+    <div class="form-error-message">
+      <strong>{{ errors }}</strong>
+    </div>
+  {% endif %}
   {% if label_display in ['before', 'invisible'] %}
     {{ label }}
   {% endif %}
diff --git a/core/themes/seven/css/components/form.css b/core/themes/seven/css/components/form.css
index 72980e5..7deb2e6 100644
--- a/core/themes/seven/css/components/form.css
+++ b/core/themes/seven/css/components/form.css
@@ -83,6 +83,9 @@ label[for] {
   height: 7px;
 }
 
+.form-error-message {
+  color: #ea2800;
+}
 
 /* Filter */
 .filter-wrapper {
@@ -96,6 +99,7 @@ div.description,
   font-size: 0.9em;
 }
 .form-item .description.error {
+  margin-top: 0;
   color: #a51b00;
 }
 
@@ -171,14 +175,6 @@ textarea.form-textarea {
   width: auto;
 }
 
-.form-item .password-suggestions {
-  float: left; /* LTR */
-  clear: left;
-  width: 100%;
-}
-[dir="rtl"] .form-item .password-suggestions {
-  float: right;
-}
 .form-item-pass .description {
   clear: both;
 }
diff --git a/core/modules/system/templates/fieldset.html.twig b/core/themes/seven/templates/fieldset.html.twig
similarity index 89%
copy from core/modules/system/templates/fieldset.html.twig
copy to core/themes/seven/templates/fieldset.html.twig
index ab6796c..cf7db0d 100644
--- a/core/modules/system/templates/fieldset.html.twig
+++ b/core/themes/seven/templates/fieldset.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables:
  * - attributes: HTML attributes for the fieldset element.
+ * - errors: (optional) Any errors for this fieldset element, may not be set.
  * - required: Boolean indicating whether the fieldeset element is required.
  * - legend: The legend element containing the following properties:
  *   - title: Title of the fieldset, intended for use as the text of the legend.
@@ -33,6 +34,11 @@
     <span{{ legend_span.attributes.addClass(legend_span_classes) }}>{{ legend.title }}</span>
   </legend>
   <div class="fieldset-wrapper">
+    {% if errors %}
+      <div class="form-error-message">
+        <strong>{{ errors }}</strong>
+      </div>
+    {% endif %}
     {% if prefix %}
       <span class="field-prefix">{{ prefix }}</span>
     {% endif %}
diff --git a/core/modules/system/templates/form-element.html.twig b/core/themes/seven/templates/form-element.html.twig
similarity index 94%
copy from core/modules/system/templates/form-element.html.twig
copy to core/themes/seven/templates/form-element.html.twig
index a961801..3a1ef12 100644
--- a/core/modules/system/templates/form-element.html.twig
+++ b/core/themes/seven/templates/form-element.html.twig
@@ -5,6 +5,7 @@
  *
  * Available variables:
  * - attributes: HTML attributes for the containing element.
+ * - errors: (optional) Any errors for this form element, may not be set.
  * - prefix: (optional) The form element prefix, may not be set.
  * - suffix: (optional) The form element suffix, may not be set.
  * - required: The required marker, or empty if the associated form element is
@@ -52,6 +53,7 @@
     'form-item-' ~ name|clean_class,
     title_display not in ['after', 'before'] ? 'form-no-label',
     disabled == 'disabled' ? 'form-disabled',
+    errors ? 'form-error',
   ]
 %}
 {%
@@ -79,6 +81,11 @@
   {% if label_display == 'after' %}
     {{ label }}
   {% endif %}
+  {% if errors %}
+    <div class="form-error-message">
+      <strong>{{ errors }}</strong>
+    </div>
+  {% endif %}
   {% if description_display in ['after', 'invisible'] and description.content %}
     <div{{ description.attributes.addClass(description_classes) }}>
       {{ description.content }}