diff --git a/core/modules/taxonomy/css/taxonomy.theme.css b/core/modules/taxonomy/css/taxonomy.theme.css
deleted file mode 100644
index 543666a..0000000
--- a/core/modules/taxonomy/css/taxonomy.theme.css
+++ /dev/null
@@ -1,10 +0,0 @@
-
-.taxonomy-term-preview {
-  background-color: #eee;
-}
-.taxonomy-term-divider-top {
-  border-bottom: none;
-}
-.taxonomy-term-divider-bottom {
-  border-top: 1px dotted #ccc;
-}
diff --git a/core/modules/taxonomy/src/Form/OverviewTerms.php b/core/modules/taxonomy/src/Form/OverviewTerms.php
index 556e79b..20b359f 100644
--- a/core/modules/taxonomy/src/Form/OverviewTerms.php
+++ b/core/modules/taxonomy/src/Form/OverviewTerms.php
@@ -295,20 +295,6 @@ public function buildForm(array $form, FormStateInterface $form_state, Vocabular
         $form['terms'][$key]['#attributes']['class'][] = 'draggable';
       }
 
-      // Add classes that mark which terms belong to previous and next pages.
-      if ($row_position < $back_step || $row_position >= $page_entries - $forward_step) {
-        $form['terms'][$key]['#attributes']['class'][] = 'taxonomy-term-preview';
-      }
-
-      if ($row_position !== 0 && $row_position !== count($tree) - 1) {
-        if ($row_position == $back_step - 1 || $row_position == $page_entries - $forward_step - 1) {
-          $form['terms'][$key]['#attributes']['class'][] = 'taxonomy-term-divider-top';
-        }
-        elseif ($row_position == $back_step || $row_position == $page_entries - $forward_step) {
-          $form['terms'][$key]['#attributes']['class'][] = 'taxonomy-term-divider-bottom';
-        }
-      }
-
       // Add an error class if this row contains a form error.
       foreach ($errors as $error_key => $error) {
         if (strpos($error_key, $key) === 0) {
@@ -333,11 +319,6 @@ public function buildForm(array $form, FormStateInterface $form_state, Vocabular
         'group' => 'term-depth',
         'hidden' => FALSE,
       );
-      $form['terms']['#attached']['library'][] = 'taxonomy/drupal.taxonomy';
-      $form['terms']['#attached']['drupalSettings']['taxonomy'] = [
-        'backStep' => $back_step,
-        'forwardStep' => $forward_step,
-      ];
     }
     $form['terms']['#tabledrag'][] = array(
       'action' => 'order',
diff --git a/core/modules/taxonomy/taxonomy.js b/core/modules/taxonomy/taxonomy.js
deleted file mode 100644
index fb4c0ce..0000000
--- a/core/modules/taxonomy/taxonomy.js
+++ /dev/null
@@ -1,53 +0,0 @@
-/**
- * @file
- * Taxonomy behaviors.
- */
-
-(function ($) {
-
-  "use strict";
-
-  /**
-   * Move a block in the blocks table from one region to another via select list.
-   *
-   * This behavior is dependent on the tableDrag behavior, since it uses the
-   * objects initialized in that behavior to update the row.
-   *
-   * @type {Drupal~behavior}
-   */
-  Drupal.behaviors.termDrag = {
-    attach: function (context, settings) {
-      var backStep = settings.taxonomy.backStep;
-      var forwardStep = settings.taxonomy.forwardStep;
-      // Get the blocks tableDrag object.
-      var tableDrag = Drupal.tableDrag.taxonomy;
-      var $table = $('#taxonomy');
-      var rows = $table.find('tr').length;
-
-      // When a row is swapped, keep previous and next page classes set.
-      tableDrag.row.prototype.onSwap = function (swappedRow) {
-        $table.find('tr.taxonomy-term-preview').removeClass('taxonomy-term-preview');
-        $table.find('tr.taxonomy-term-divider-top').removeClass('taxonomy-term-divider-top');
-        $table.find('tr.taxonomy-term-divider-bottom').removeClass('taxonomy-term-divider-bottom');
-
-        var tableBody = $table[0].tBodies[0];
-        if (backStep) {
-          for (var n = 0; n < backStep; n++) {
-            $(tableBody.rows[n]).addClass('taxonomy-term-preview');
-          }
-          $(tableBody.rows[backStep - 1]).addClass('taxonomy-term-divider-top');
-          $(tableBody.rows[backStep]).addClass('taxonomy-term-divider-bottom');
-        }
-
-        if (forwardStep) {
-          for (var k = rows - forwardStep - 1; k < rows - 1; k++) {
-            $(tableBody.rows[k]).addClass('taxonomy-term-preview');
-          }
-          $(tableBody.rows[rows - forwardStep - 2]).addClass('taxonomy-term-divider-top');
-          $(tableBody.rows[rows - forwardStep - 1]).addClass('taxonomy-term-divider-bottom');
-        }
-      };
-    }
-  };
-
-})(jQuery);
diff --git a/core/modules/taxonomy/taxonomy.libraries.yml b/core/modules/taxonomy/taxonomy.libraries.yml
deleted file mode 100644
index 3a7904f..0000000
--- a/core/modules/taxonomy/taxonomy.libraries.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-drupal.taxonomy:
-  version: VERSION
-  js:
-    taxonomy.js: {}
-  css:
-    component:
-      css/taxonomy.theme.css: {}
-  dependencies:
-    - core/jquery
-    - core/drupal
-    - core/drupalSettings
-    - core/drupal.tabledrag