diff --git a/core/modules/filter/src/Plugin/Filter/FilterHtml.php b/core/modules/filter/src/Plugin/Filter/FilterHtml.php
index 38d798a..59f8c30 100644
--- a/core/modules/filter/src/Plugin/Filter/FilterHtml.php
+++ b/core/modules/filter/src/Plugin/Filter/FilterHtml.php
@@ -46,12 +46,10 @@ class FilterHtml extends FilterBase {
    */
   public function settingsForm(array $form, FormStateInterface $form_state) {
     $form['allowed_html'] = array(
-      '#type' => 'textfield',
+      '#type' => 'textarea',
       '#title' => $this->t('Allowed HTML tags'),
       '#default_value' => $this->settings['allowed_html'],
-      '#maxlength' => 1024,
       '#description' => $this->t('A list of HTML tags that can be used. JavaScript event attributes, JavaScript URLs, and CSS are always stripped.'),
-      '#size' => 250,
       '#attached' => array(
         'library' => array(
           'filter/drupal.filter.filter_html.admin',