diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/StringTextfieldWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/StringTextfieldWidget.php
index 4262380..b93d9ee 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/StringTextfieldWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/StringTextfieldWidget.php
@@ -2,7 +2,10 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldWidget;
 
+use Drupal\Component\Utility\Html;
+use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Field\WidgetBase;
 use Drupal\Core\Form\FormStateInterface;
 
@@ -23,29 +26,29 @@ class StringTextfieldWidget extends WidgetBase {
    * {@inheritdoc}
    */
   public static function defaultSettings() {
-    return [
+    return array(
         'size' => 60,
         'placeholder' => '',
-      ] + parent::defaultSettings();
+      ) + parent::defaultSettings();
   }
 
   /**
    * {@inheritdoc}
    */
   public function settingsForm(array $form, FormStateInterface $form_state) {
-    $element['size'] = [
+    $element['size'] = array(
       '#type' => 'number',
       '#title' => t('Size of textfield'),
       '#default_value' => $this->getSetting('size'),
       '#required' => TRUE,
       '#min' => 1,
-    ];
-    $element['placeholder'] = [
+    );
+    $element['placeholder'] = array(
       '#type' => 'textfield',
       '#title' => t('Placeholder'),
       '#default_value' => $this->getSetting('placeholder'),
       '#description' => t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
-    ];
+    );
     return $element;
   }
 
@@ -53,12 +56,12 @@ public function settingsForm(array $form, FormStateInterface $form_state) {
    * {@inheritdoc}
    */
   public function settingsSummary() {
-    $summary = [];
+    $summary = array();
 
-    $summary[] = t('Textfield size: @size', ['@size' => $this->getSetting('size')]);
+    $summary[] = t('Textfield size: @size', array('@size' => $this->getSetting('size')));
     $placeholder = $this->getSetting('placeholder');
     if (!empty($placeholder)) {
-      $summary[] = t('Placeholder: @placeholder', ['@placeholder' => $placeholder]);
+      $summary[] = t('Placeholder: @placeholder', array('@placeholder' => $placeholder));
     }
 
     return $summary;
@@ -68,16 +71,127 @@ public function settingsSummary() {
    * {@inheritdoc}
    */
   public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
-    $element['value'] = $element + [
+
+    $field_name = $this->fieldDefinition->getName();
+    $parents = array_merge($element['#field_parents'], array($field_name, $delta));
+    $element['value'] = $element + array(
         '#type' => 'textfield',
         '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : NULL,
         '#size' => $this->getSetting('size'),
         '#placeholder' => $this->getSetting('placeholder'),
         '#maxlength' => $this->getFieldSetting('max_length'),
-        '#attributes' => ['class' => ['js-text-full', 'text-full']],
+        '#attributes' => array('class' => array('js-text-full', 'text-full')),
+      );
+    if ($this->fieldDefinition->getFieldStorageDefinition()->getCardinality() == FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED) {
+      $element['actions'] = [
+        '#type' => 'actions',
+        'remove_button' => [
+          '#delta' => $delta,
+          '#name' => implode('_', $parents) . '_remove_button',
+          '#type' => 'submit',
+          '#value' => t('Remove'),
+          '#validate' => [],
+          '#submit' => [[static::class, 'ajaxcallbackremove']],
+          '#limit_validation_errors' => [],
+          '#attributes' => array('class' => array('remove-field-delta--' . $delta, 'custom-class')),
+          '#ajax' => [
+            'callback' => array($this, 'removeAjaxCallbac'),
+            //'options' => $options,
+            'effect' => 'fade',
+            'wrapper' => $form['#wrapper_id'],
+          ],
+        ],
+        '#weight' => 1000,
       ];
-
+    }
     return $element;
   }
 
+  /**
+   * @param FieldItemListInterface $items
+   * @param array $form
+   * @param FormStateInterface $form_state
+   * @return array
+   */
+  protected function formMultipleElements(FieldItemListInterface $items, array &$form, FormStateInterface $form_state) {
+    if ((count($items) > 0) && !$form_state->isRebuilding() && !$items->getEntity()->isNew()) {
+      $field_name = $this->fieldDefinition->getName();
+      $cardinality = $this->fieldDefinition->getFieldStorageDefinition()->getCardinality();
+      $parents = $form['#parents'];
+      if ($cardinality == FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED) {
+        $field_state = static::getWidgetState($parents, $field_name, $form_state);
+        $field_state['items_count']--;
+        static::setWidgetState($parents, $field_name, $form_state, $field_state);
+      }
+    }
+    $form['#wrapper_id'] = Html::getUniqueID($items->getName());
+    $elements = parent::formMultipleElements($items, $form, $form_state);
+    $elements['#prefix'] = '<div id="' . $form['#wrapper_id'] . '">';
+    $elements['#suffix'] = '</div>';
+    $elements['add_more']['#ajax']['wrapper'] = $form['#wrapper_id'];
+    return $elements;
+  }
+
+  /**
+   * @param $form
+   * @param FormStateInterface $form_state
+   */
+  public function ajaxcallbackremove($form, FormStateInterface $form_state) {
+
+    $button = $form_state->getTriggeringElement();
+    $delta = $button['#delta'];
+    $address = array_slice($button['#array_parents'], 0, -4);
+    $address_state = array_slice($button['#parents'], 0, -3);
+    $parent_element = NestedArray::getValue($form, array_merge($address, array('widget')));
+    $field_name = $parent_element['#field_name'];
+    $parents = $parent_element['#field_parents'];
+    $field_state = static::getWidgetState($parents, $field_name, $form_state);
+
+    for ($i = $delta; $i <= $field_state['items_count']; $i++) {
+
+      $old_element_address = array_merge($address, array('widget', $i + 1));
+      $old_element_state_address = array_merge($address_state, array($i + 1));
+      $new_element_state_address = array_merge($address_state, array($i));
+      $moving_element = NestedArray::getValue($form, $old_element_address);
+      $moving_element_value = NestedArray::getValue($form_state->getValues(), $old_element_state_address);
+      $moving_element_input = NestedArray::getValue($form_state->getUserInput(), $old_element_state_address);
+
+      // Tell the element where it's being moved to.
+      $moving_element['#parents'] = $new_element_state_address;
+
+      // Move the element around.
+      $form_state->setValueForElement($moving_element, $moving_element_value);
+      $user_input = $form_state->getUserInput();
+      NestedArray::setValue($user_input, $moving_element['#parents'], $moving_element_input);
+      $form_state->setUserInput($user_input);
+    }
+
+    if ($field_state['items_count'] > 0) {
+      $field_state['items_count']--;
+    }
+    $input = NestedArray::getValue($form_state->getUserInput(), $address);
+    $weight = -1 * $field_state['items_count'];
+    foreach ($input as $key => $item) {
+      if ($item) {
+        $input[$key]['_weight'] = $weight++;
+      }
+    }
+    $user_input = $form_state->getUserInput();
+    NestedArray::setValue($user_input, $address, $input);
+    $form_state->setUserInput($user_input);
+
+    static::setWidgetState($parents, $field_name, $form_state, $field_state);
+
+    $form_state->setRebuild();
+  }
+
+  /**
+   * @param array $form
+   * @param FormStateInterface $form_state
+   * @return mixed
+   */
+  public function removeAjaxCallbac(array &$form, FormStateInterface $form_state) {
+    $button = $form_state->getTriggeringElement();
+    return NestedArray::getValue($form, array_slice($button['#array_parents'], 0, -3));
+  }
 }