diff --git a/core/core.libraries.yml b/core/core.libraries.yml
index 987d43bfee..106839c707 100644
--- a/core/core.libraries.yml
+++ b/core/core.libraries.yml
@@ -492,6 +492,7 @@ jquery.ui.autocomplete:
     - core/jquery.ui.widget
     - core/jquery.ui.position
     - core/jquery.ui.menu
+  deprecated: The "%library_id%" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/project/drupal/issues/3076171
 
 jquery.ui.button:
   version: *jquery_ui_version
diff --git a/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php b/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php
index 0691239dfa..9fb5330928 100644
--- a/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php
+++ b/core/lib/Drupal/Core/Entity/Element/EntityAutocomplete.php
@@ -142,6 +142,21 @@ public static function processEntityAutocomplete(array &$element, FormStateInter
       'selection_settings_key' => $selection_settings_key,
     ];
 
+    // Create attribute that will be used for client-side enforcement of field
+    // cardinality.
+    $name = explode('[', $element['#name'])[0];
+    if (!empty($complete_form[$name]['widget']['#theme']) && $complete_form[$name]['widget']['#theme'] === 'field_multiple_value_form') {
+      $cardinality = 1;
+    }
+    elseif (!empty($complete_form[$name]['widget']['#cardinality'])) {
+      $cardinality = $complete_form[$name]['widget']['#cardinality'];
+    }
+    else {
+      $cardinality = -1;
+    }
+
+    $complete_form[$name]['#attributes']['data-autocomplete-cardinality'] = $cardinality;
+
     return $element;
   }
 
diff --git a/core/lib/Drupal/Core/Form/FormState.php b/core/lib/Drupal/Core/Form/FormState.php
index 8264371c83..d2f8cafb4a 100644
--- a/core/lib/Drupal/Core/Form/FormState.php
+++ b/core/lib/Drupal/Core/Form/FormState.php
@@ -1109,11 +1109,13 @@ public function clearErrors() {
   public function getError(array $element) {
     if ($errors = $this->getErrors()) {
       $parents = [];
-      foreach ($element['#parents'] as $parent) {
-        $parents[] = $parent;
-        $key = implode('][', $parents);
-        if (isset($errors[$key])) {
-          return $errors[$key];
+      if (!empty($element['#parents'])) {
+        foreach ($element['#parents'] as $parent) {
+          $parents[] = $parent;
+          $key = implode('][', $parents);
+          if (isset($errors[$key])) {
+            return $errors[$key];
+          }
         }
       }
     }
diff --git a/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.info.yml b/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.info.yml
new file mode 100644
index 0000000000..f29cf8490c
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.info.yml
@@ -0,0 +1,5 @@
+name: 'Awesomplete Autocomplete'
+type: module
+description: 'Provides a replacement for jQuery UI Autocomplete which will be deprecated in Drupal 9.0.'
+package: 'Core (Experimental)'
+core: 8.x
diff --git a/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.libraries.yml b/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.libraries.yml
new file mode 100644
index 0000000000..e88ba4d413
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.libraries.yml
@@ -0,0 +1,23 @@
+awesomplete:
+  version: 1.1.5
+  license:
+    name: MIT
+    url: https://github.com/LeaVerou/awesomplete/blob/gh-pages/LICENSE
+    gpl-compatible: true
+  js:
+    js/awesomplete.min.js: {}
+  css:
+    component:
+      css/awesomplete.base.css: {}
+      css/awesomplete.theme.css: {}
+
+autocomplete:
+  version: VERSION
+  js:
+    js/autocomplete.js: {}
+  dependencies:
+    - core/drupal
+    - core/drupalSettings
+    - core/drupal.ajax
+    - core/drupal.announce
+    - awesomplete_autocomplete/awesomplete
diff --git a/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.module b/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.module
new file mode 100644
index 0000000000..11c7189d01
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/awesomplete_autocomplete.module
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * @file
+ * Provides a replacement for jQuery UI Autocomplete.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+
+/**
+ * Implements hook_help().
+ */
+function awesomplete_autocomplete_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.awesomplete_autocomplete':
+      $output = '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('The Awesomplete Autocomplete module implements a replacement for jQuery UI Autocomplete. The asset library <code>core/jquery.ui.autocomplete</code> is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. Enabling this module overrides the current core asset library to evaluate Awesomplete and to assist with making any necessary style or API changes to themes or modules.') . '</p>';
+      $output .= '<p>' . t('For more information, see the <a href=":awesomplete_autocomplete">online documentation for the Awesomplete Autocomplete module.</a>.', [':awesomplete_autocomplete' => 'https://www.drupal.org/docs/8/core/modules/experimental-awesomplete-autocomplete']) . '</p>';
+      return $output;
+  }
+}
+
+/**
+ * Implements hook_library_info_alter().
+ */
+function awesomplete_autocomplete_library_info_alter(&$libraries, $extension) {
+  if ($extension == 'core' && isset($libraries['drupal.autocomplete'])) {
+    // Remove core js.
+    $libraries['drupal.autocomplete']['js'] = [];
+    // Replace dependency.
+    if ($index = array_search('core/jquery.ui.autocomplete', $libraries['drupal.autocomplete']['dependencies'])) {
+      $libraries['drupal.autocomplete']['dependencies'][$index] = 'awesomplete_autocomplete/autocomplete';
+    }
+  }
+}
diff --git a/core/modules/awesomplete_autocomplete/css/awesomplete.base.css b/core/modules/awesomplete_autocomplete/css/awesomplete.base.css
new file mode 100644
index 0000000000..8ef48ca521
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/css/awesomplete.base.css
@@ -0,0 +1,33 @@
+.awesomplete [hidden] {
+  display: none;
+}
+
+.awesomplete .visually-hidden {
+  position: absolute;
+  clip: rect(0, 0, 0, 0);
+}
+
+.awesomplete {
+  display: inline-block;
+  position: relative;
+}
+
+.awesomplete > input {
+  display: block;
+}
+
+.awesomplete > ul {
+  position: absolute;
+  left: 0;
+  z-index: 1;
+  min-width: 100%;
+  box-sizing: border-box;
+  list-style: none;
+  padding: 0;
+  margin: 0;
+  background: #fff;
+}
+
+.awesomplete > ul:empty {
+  display: none;
+}
diff --git a/core/modules/awesomplete_autocomplete/css/awesomplete.theme.css b/core/modules/awesomplete_autocomplete/css/awesomplete.theme.css
new file mode 100644
index 0000000000..7e8e43b347
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/css/awesomplete.theme.css
@@ -0,0 +1,12 @@
+.awesomplete > ul > li {
+  padding: 3px 1em 3px 0.4em;
+  cursor: pointer;
+}
+
+.awesomplete > ul > li:focus,
+.awesomplete > ul > li:hover,
+.awesomplete > ul > li[aria-selected="true"] {
+  margin: 0;
+  color: #fff;
+  background: #0072b9;
+}
diff --git a/core/modules/awesomplete_autocomplete/js/autocomplete.es6.js b/core/modules/awesomplete_autocomplete/js/autocomplete.es6.js
new file mode 100644
index 0000000000..1d192a9afc
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/js/autocomplete.es6.js
@@ -0,0 +1,317 @@
+/**
+ * @file
+ * Autocomplete based on Awesomplete.
+ */
+
+((Drupal, Awesomplete) => {
+  let autocomplete;
+  const { announce, formatPlural } = Drupal;
+
+  /**
+   * Helper splitting terms from the autocomplete value.
+   *
+   * @function Drupal.autocomplete.splitValues
+   *
+   * @param {string} value
+   *   The value being entered by the user.
+   *
+   * @return {Array}
+   *   Array of values, split by comma.
+   */
+  const autocompleteSplitValues = value => {
+    // We will match the value against comma-separated terms.
+    const result = [];
+    let quote = false;
+    let current = '';
+    const valueLength = value.length;
+    let character;
+
+    for (let i = 0; i < valueLength; i++) {
+      character = value.charAt(i);
+      if (character === '"') {
+        current += character;
+        quote = !quote;
+      } else if (character === ',' && !quote) {
+        result.push(current.trim());
+        current = '';
+      } else {
+        current += character;
+      }
+    }
+    if (value.length > 0) {
+      result.push(current.trim());
+    }
+    return result;
+  };
+
+  /**
+   * Returns the last value of an multi-value textfield.
+   *
+   * @function Drupal.autocomplete.extractLastTerm
+   *
+   * @param {string} terms
+   *   The value of the field.
+   *
+   * @return {string}
+   *   The last value of the input field.
+   */
+  const extractLastTerm = terms => autocomplete.splitValues(terms).pop();
+
+  /**
+   * Return the id from a term value.
+   *
+   * @param {object} term
+   *   A suggestion based on user input. It is an object with label and value
+   *   properties.
+   * @return {string}
+   *   The term id.
+   */
+  const extractTermID = term =>
+    term.value ? term.value.search(/\((\d+)\)$/) : '';
+
+  /**
+   * Determines if a suggestion should be an available option.
+   * Does not use arrow syntax so there is access to Awesomplete's this object.
+   * @param {object} suggestion
+   *   A suggestion based on user input. It is an object with label and value
+   *   properties.
+   * @param {string} input
+   *   The text entered in the input field.
+   *
+   * @return {boolean}
+   *   If the suggestion should be displayed in the results.
+   */
+  function filterResults(suggestion, input) {
+    const { options } = Drupal.autocomplete;
+    const inputElement = this.input;
+    const inputWrapper = inputElement.closest(
+      '[data-autocomplete-cardinality]',
+    );
+    const cardinality = inputWrapper
+      ? inputWrapper.getAttribute('data-autocomplete-cardinality')
+      : -1;
+    const suggestionValue = suggestion.value;
+    const currentValues = autocomplete.splitValues(input);
+
+    const inputSpecificFirstCharDenylist = inputElement.hasAttribute(
+      'data-autocomplete-first-character-denylist',
+    )
+      ? inputElement.getAttribute('data-autocomplete-first-character-denylist')
+      : '';
+
+    // Prevent suggestions if the maximum number of items is reached.
+    if (cardinality > 0 && currentValues.length > cardinality) {
+      return false;
+    }
+
+    // Prevent suggestions if the first input character is in the denylist.
+    if (
+      options.firstCharacterDenylist.indexOf(input[0]) !== -1 ||
+      inputSpecificFirstCharDenylist.indexOf(input[0]) !== -1
+    ) {
+      return false;
+    }
+
+    // Do not show items already added to field.
+    if (currentValues.indexOf(suggestionValue) !== -1) {
+      return false;
+    }
+
+    return Awesomplete.FILTER_CONTAINS(suggestion, extractLastTerm(input));
+  }
+
+  /**
+   * Displays a suggestion with the search string highlighted.
+   *
+   * @param {object} suggestion
+   *   A suggestion based on user input. It is an object with label and value
+   *   properties.
+   * @param {string} input
+   *   The text entered in the input field.
+   * @return {HTMLElement}
+   *   A list element containing a suggestion.
+   */
+  const displayItem = (suggestion, input) =>
+    Awesomplete.ITEM(
+      suggestion,
+      extractLastTerm(input),
+      extractTermID(suggestion),
+    );
+
+  /**
+   * Replaces the value of an input field when a new value is chosen.
+   * Does not use arrow syntax so there is access to Awesomplete's this object.
+   *
+   * @param {object} item
+   *   The item being added to the field. Has label and value properties.
+   */
+  function replaceInputValue(item) {
+    const inputElement = this.input;
+    const cardinality = inputElement
+      .closest('[data-autocomplete-cardinality]')
+      .getAttribute('data-autocomplete-cardinality');
+    const numItems = autocomplete.splitValues(inputElement.value).length;
+
+    // Add a comma separator if the field allows additional items.
+    const separator =
+      numItems < cardinality || parseInt(cardinality, 10) === 0 ? ',' : '';
+
+    const before = this.input.value.match(/^.+,\s*|/)[0];
+    this.input.value = `${before}${item.value}${separator}`;
+  }
+
+  /**
+   * Attaches the autocomplete behavior to all required fields.
+   *
+   * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches the autocomplete behaviors.
+   * @prop {Drupal~behaviorDetach} detach
+   *   Detaches the autocomplete behaviors.
+   */
+  Drupal.behaviors.autocomplete = {
+    attach(context) {
+      const autoCompleteInputs = context.querySelectorAll(
+        'input.form-autocomplete',
+      );
+
+      const { options } = Drupal.autocomplete;
+
+      Array.prototype.forEach.call(autoCompleteInputs, autocompleteElement => {
+        // The first time autocomplete results appear on a field, the
+        // screenreader provides detailed instructions on how to navigate the
+        // options. After the first time, this variable is set to true so the
+        // screenreader does not provide lengthy instructions each time.
+        let autocompleteInstructionsRead = false;
+
+        // Determine if a field accepts multiple values and set the Awesomplete
+        // data attribute accordingly.
+        const cardinality = autocompleteElement
+          .closest('[data-autocomplete-cardinality]')
+          .getAttribute('data-autocomplete-cardinality');
+
+        if (cardinality !== '1') {
+          autocompleteElement.setAttribute('data-multiple', '');
+        }
+
+        // Add screenreader-only information to label that specifies it is an
+        // autocomplete field.
+        const label = autocompleteElement
+          .closest('.form-item')
+          .querySelector('label');
+        label.innerHTML += `<span class="visually-hidden">(${Drupal.t(
+          'Autocomplete input',
+        )})</span>`;
+
+        const awesomplete = new Awesomplete(autocompleteElement, {
+          minChars: options.minChars,
+          autoFirst: options.autoFirst,
+          sort: options.sort,
+          filter: options.filter,
+          item: options.item,
+          replace: options.replace,
+        });
+
+        // Add class previously added by jQueryUI for backwards compatibility.
+        autocompleteElement.classList.add('ui-autocomplete-input');
+        awesomplete.ul.classList.add('ui-autocomplete');
+
+        // Change role to textbox, Awesomplete defaults to combobox. The
+        // screenreader instructions for combobox assume select options are
+        // already present, which is not the case with autocomplete fields.
+        autocompleteElement.setAttribute('role', 'textbox');
+
+        // Screenreader announces the number of results found, and if it is
+        // the first set of results for a field, additional instructions on
+        // navigating the results are provided.
+        const readResults = count => {
+          const beginning = formatPlural(
+            count,
+            'There is one result available.',
+            'There are @count results available.',
+          );
+          const end = autocompleteInstructionsRead
+            ? ''
+            : ' Use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.';
+          announce(Drupal.t(`${beginning}${end}`), 'assertive');
+          autocompleteInstructionsRead = true;
+        };
+
+        // Responds to user input and generates autocomplete suggestions.
+        autocompleteElement.addEventListener('input', event => {
+          const input = event.target;
+          const inputId = input.getAttribute('id');
+          const term = autocomplete.extractLastTerm(input.value);
+
+          if (!(inputId in autocomplete.cache)) {
+            autocomplete.cache[inputId] = {};
+          }
+
+          if (term && term.length > 0) {
+            if (autocomplete.cache[inputId].hasOwnProperty(term)) {
+              awesomplete.list = autocomplete.cache[inputId][term];
+              awesomplete.evaluate();
+              readResults(awesomplete.ul.children.length);
+            } else {
+              const apiUrl = input.getAttribute('data-autocomplete-path');
+              input.classList.add('ui-autocomplete-loading');
+              const xhr = new XMLHttpRequest();
+              xhr.open('GET', `${apiUrl}?q=${term}`);
+              xhr.onload = () => {
+                input.classList.remove('ui-autocomplete-loading');
+                if (xhr.status === 200) {
+                  const results = JSON.parse(xhr.response);
+                  awesomplete.list = results;
+                  awesomplete.evaluate();
+                  autocomplete.cache[inputId][term] = results;
+                  readResults(results.length);
+                }
+              };
+              xhr.send();
+            }
+          }
+        });
+      });
+    },
+
+    detach(context) {
+      const autoCompleteInputs = context.querySelectorAll(
+        'input.form-autocomplete',
+      );
+      Array.prototype.forEach.call(autoCompleteInputs, autocompleteElement => {
+        autocompleteElement.removeEventListener('input');
+      });
+    },
+  };
+
+  /**
+   * Autocomplete object implementation.
+   *
+   * @namespace Drupal.autocomplete
+   */
+  autocomplete = {
+    cache: {},
+    splitValues: autocompleteSplitValues,
+    extractLastTerm,
+    // Awesomplete options.
+
+    /**
+     * Awesomplete option object.
+     *
+     * @name Drupal.autocomplete.options
+     */
+    options: {
+      filter: filterResults,
+      item: displayItem,
+      replace: replaceInputValue,
+      sort: false,
+      minChars: 1,
+      firstCharacterDenylist: ',',
+      autoFirst: false,
+      maxItems: 10,
+    },
+  };
+
+  Drupal.autocomplete = autocomplete;
+})(Drupal, Awesomplete);
diff --git a/core/modules/awesomplete_autocomplete/js/autocomplete.js b/core/modules/awesomplete_autocomplete/js/autocomplete.js
new file mode 100644
index 0000000000..be14c716c2
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/js/autocomplete.js
@@ -0,0 +1,188 @@
+/**
+* DO NOT EDIT THIS FILE.
+* See the following change record for more information,
+* https://www.drupal.org/node/2815083
+* @preserve
+**/
+
+(function (Drupal, Awesomplete) {
+  var autocomplete = void 0;
+  var announce = Drupal.announce,
+      formatPlural = Drupal.formatPlural;
+
+  var autocompleteSplitValues = function autocompleteSplitValues(value) {
+    var result = [];
+    var quote = false;
+    var current = '';
+    var valueLength = value.length;
+    var character = void 0;
+
+    for (var i = 0; i < valueLength; i++) {
+      character = value.charAt(i);
+      if (character === '"') {
+        current += character;
+        quote = !quote;
+      } else if (character === ',' && !quote) {
+        result.push(current.trim());
+        current = '';
+      } else {
+        current += character;
+      }
+    }
+    if (value.length > 0) {
+      result.push(current.trim());
+    }
+    return result;
+  };
+
+  var extractLastTerm = function extractLastTerm(terms) {
+    return autocomplete.splitValues(terms).pop();
+  };
+
+  var extractTermID = function extractTermID(term) {
+    return term.value ? term.value.search(/\((\d+)\)$/) : '';
+  };
+
+  function filterResults(suggestion, input) {
+    var options = Drupal.autocomplete.options;
+
+    var inputElement = this.input;
+    var inputWrapper = inputElement.closest('[data-autocomplete-cardinality]');
+    var cardinality = inputWrapper ? inputWrapper.getAttribute('data-autocomplete-cardinality') : -1;
+    var suggestionValue = suggestion.value;
+    var currentValues = autocomplete.splitValues(input);
+
+    var inputSpecificFirstCharDenylist = inputElement.hasAttribute('data-autocomplete-first-character-denylist') ? inputElement.getAttribute('data-autocomplete-first-character-denylist') : '';
+
+    if (cardinality > 0 && currentValues.length > cardinality) {
+      return false;
+    }
+
+    if (options.firstCharacterDenylist.indexOf(input[0]) !== -1 || inputSpecificFirstCharDenylist.indexOf(input[0]) !== -1) {
+      return false;
+    }
+
+    if (currentValues.indexOf(suggestionValue) !== -1) {
+      return false;
+    }
+
+    return Awesomplete.FILTER_CONTAINS(suggestion, extractLastTerm(input));
+  }
+
+  var displayItem = function displayItem(suggestion, input) {
+    return Awesomplete.ITEM(suggestion, extractLastTerm(input), extractTermID(suggestion));
+  };
+
+  function replaceInputValue(item) {
+    var inputElement = this.input;
+    var cardinality = inputElement.closest('[data-autocomplete-cardinality]').getAttribute('data-autocomplete-cardinality');
+    var numItems = autocomplete.splitValues(inputElement.value).length;
+
+    var separator = numItems < cardinality || parseInt(cardinality, 10) === 0 ? ',' : '';
+
+    var before = this.input.value.match(/^.+,\s*|/)[0];
+    this.input.value = '' + before + item.value + separator;
+  }
+
+  Drupal.behaviors.autocomplete = {
+    attach: function attach(context) {
+      var autoCompleteInputs = context.querySelectorAll('input.form-autocomplete');
+
+      var options = Drupal.autocomplete.options;
+
+
+      Array.prototype.forEach.call(autoCompleteInputs, function (autocompleteElement) {
+        var autocompleteInstructionsRead = false;
+
+        var cardinality = autocompleteElement.closest('[data-autocomplete-cardinality]').getAttribute('data-autocomplete-cardinality');
+
+        if (cardinality !== '1') {
+          autocompleteElement.setAttribute('data-multiple', '');
+        }
+
+        var label = autocompleteElement.closest('.form-item').querySelector('label');
+        label.innerHTML += '<span class="visually-hidden">(' + Drupal.t('Autocomplete input') + ')</span>';
+
+        var awesomplete = new Awesomplete(autocompleteElement, {
+          minChars: options.minChars,
+          autoFirst: options.autoFirst,
+          sort: options.sort,
+          filter: options.filter,
+          item: options.item,
+          replace: options.replace
+        });
+
+        autocompleteElement.classList.add('ui-autocomplete-input');
+        awesomplete.ul.classList.add('ui-autocomplete');
+
+        autocompleteElement.setAttribute('role', 'textbox');
+
+        var readResults = function readResults(count) {
+          var beginning = formatPlural(count, 'There is one result available.', 'There are @count results available.');
+          var end = autocompleteInstructionsRead ? '' : ' Use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.';
+          announce(Drupal.t('' + beginning + end), 'assertive');
+          autocompleteInstructionsRead = true;
+        };
+
+        autocompleteElement.addEventListener('input', function (event) {
+          var input = event.target;
+          var inputId = input.getAttribute('id');
+          var term = autocomplete.extractLastTerm(input.value);
+
+          if (!(inputId in autocomplete.cache)) {
+            autocomplete.cache[inputId] = {};
+          }
+
+          if (term && term.length > 0) {
+            if (autocomplete.cache[inputId].hasOwnProperty(term)) {
+              awesomplete.list = autocomplete.cache[inputId][term];
+              awesomplete.evaluate();
+              readResults(awesomplete.ul.children.length);
+            } else {
+              var apiUrl = input.getAttribute('data-autocomplete-path');
+              input.classList.add('ui-autocomplete-loading');
+              var xhr = new XMLHttpRequest();
+              xhr.open('GET', apiUrl + '?q=' + term);
+              xhr.onload = function () {
+                input.classList.remove('ui-autocomplete-loading');
+                if (xhr.status === 200) {
+                  var results = JSON.parse(xhr.response);
+                  awesomplete.list = results;
+                  awesomplete.evaluate();
+                  autocomplete.cache[inputId][term] = results;
+                  readResults(results.length);
+                }
+              };
+              xhr.send();
+            }
+          }
+        });
+      });
+    },
+    detach: function detach(context) {
+      var autoCompleteInputs = context.querySelectorAll('input.form-autocomplete');
+      Array.prototype.forEach.call(autoCompleteInputs, function (autocompleteElement) {
+        autocompleteElement.removeEventListener('input');
+      });
+    }
+  };
+
+  autocomplete = {
+    cache: {},
+    splitValues: autocompleteSplitValues,
+    extractLastTerm: extractLastTerm,
+
+    options: {
+      filter: filterResults,
+      item: displayItem,
+      replace: replaceInputValue,
+      sort: false,
+      minChars: 1,
+      firstCharacterDenylist: ',',
+      autoFirst: false,
+      maxItems: 10
+    }
+  };
+
+  Drupal.autocomplete = autocomplete;
+})(Drupal, Awesomplete);
\ No newline at end of file
diff --git a/core/modules/awesomplete_autocomplete/js/awesomplete.min.js b/core/modules/awesomplete_autocomplete/js/awesomplete.min.js
new file mode 100644
index 0000000000..a895194633
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/js/awesomplete.min.js
@@ -0,0 +1,3 @@
+// Awesomplete - Lea Verou - MIT license
+!function(){function t(t){var e=Array.isArray(t)?{label:t[0],value:t[1]}:"object"==typeof t&&"label"in t&&"value"in t?t:{label:t,value:t};this.label=e.label||e.value,this.value=e.value}function e(t,e,i){for(var n in e){var s=e[n],r=t.input.getAttribute("data-"+n.toLowerCase());"number"==typeof s?t[n]=parseInt(r):!1===s?t[n]=null!==r:s instanceof Function?t[n]=null:t[n]=r,t[n]||0===t[n]||(t[n]=n in i?i[n]:s)}}function i(t,e){return"string"==typeof t?(e||document).querySelector(t):t||null}function n(t,e){return o.call((e||document).querySelectorAll(t))}function s(){n("input.awesomplete").forEach(function(t){new r(t)})}var r=function(t,n){var s=this;r.count=(r.count||0)+1,this.count=r.count,this.isOpened=!1,this.input=i(t),this.input.setAttribute("autocomplete","off"),this.input.setAttribute("aria-expanded","false"),this.input.setAttribute("aria-owns","awesomplete_list_"+this.count),this.input.setAttribute("role","combobox"),this.options=n=n||{},e(this,{minChars:2,maxItems:10,autoFirst:!1,data:r.DATA,filter:r.FILTER_CONTAINS,sort:!1!==n.sort&&r.SORT_BYLENGTH,container:r.CONTAINER,item:r.ITEM,replace:r.REPLACE,tabSelect:!1},n),this.index=-1,this.container=this.container(t),this.ul=i.create("ul",{hidden:"hidden",role:"listbox",id:"awesomplete_list_"+this.count,inside:this.container}),this.status=i.create("span",{className:"visually-hidden",role:"status","aria-live":"assertive","aria-atomic":!0,inside:this.container,textContent:0!=this.minChars?"Type "+this.minChars+" or more characters for results.":"Begin typing for results."}),this._events={input:{input:this.evaluate.bind(this),blur:this.close.bind(this,{reason:"blur"}),keydown:function(t){var e=t.keyCode;s.opened&&(13===e&&s.selected?(t.preventDefault(),s.select()):9===e&&s.selected&&s.tabSelect?s.select():27===e?s.close({reason:"esc"}):38!==e&&40!==e||(t.preventDefault(),s[38===e?"previous":"next"]()))}},form:{submit:this.close.bind(this,{reason:"submit"})},ul:{mousedown:function(t){t.preventDefault()},click:function(t){var e=t.target;if(e!==this){for(;e&&!/li/i.test(e.nodeName);)e=e.parentNode;e&&0===t.button&&(t.preventDefault(),s.select(e,t.target))}}}},i.bind(this.input,this._events.input),i.bind(this.input.form,this._events.form),i.bind(this.ul,this._events.ul),this.input.hasAttribute("list")?(this.list="#"+this.input.getAttribute("list"),this.input.removeAttribute("list")):this.list=this.input.getAttribute("data-list")||n.list||[],r.all.push(this)};r.prototype={set list(t){if(Array.isArray(t))this._list=t;else if("string"==typeof t&&t.indexOf(",")>-1)this._list=t.split(/\s*,\s*/);else if((t=i(t))&&t.children){var e=[];o.apply(t.children).forEach(function(t){if(!t.disabled){var i=t.textContent.trim(),n=t.value||i,s=t.label||i;""!==n&&e.push({label:s,value:n})}}),this._list=e}document.activeElement===this.input&&this.evaluate()},get selected(){return this.index>-1},get opened(){return this.isOpened},close:function(t){this.opened&&(this.input.setAttribute("aria-expanded","false"),this.ul.setAttribute("hidden",""),this.isOpened=!1,this.index=-1,this.status.setAttribute("hidden",""),i.fire(this.input,"awesomplete-close",t||{}))},open:function(){this.input.setAttribute("aria-expanded","true"),this.ul.removeAttribute("hidden"),this.isOpened=!0,this.status.removeAttribute("hidden"),this.autoFirst&&-1===this.index&&this.goto(0),i.fire(this.input,"awesomplete-open")},destroy:function(){if(i.unbind(this.input,this._events.input),i.unbind(this.input.form,this._events.form),!this.options.container){var t=this.container.parentNode;t.insertBefore(this.input,this.container),t.removeChild(this.container)}this.input.removeAttribute("autocomplete"),this.input.removeAttribute("aria-autocomplete");var e=r.all.indexOf(this);-1!==e&&r.all.splice(e,1)},next:function(){var t=this.ul.children.length;this.goto(this.index<t-1?this.index+1:t?0:-1)},previous:function(){var t=this.ul.children.length,e=this.index-1;this.goto(this.selected&&-1!==e?e:t-1)},goto:function(t){var e=this.ul.children;this.selected&&e[this.index].setAttribute("aria-selected","false"),this.index=t,t>-1&&e.length>0&&(e[t].setAttribute("aria-selected","true"),this.status.textContent=e[t].textContent+", list item "+(t+1)+" of "+e.length,this.input.setAttribute("aria-activedescendant",this.ul.id+"_item_"+this.index),this.ul.scrollTop=e[t].offsetTop-this.ul.clientHeight+e[t].clientHeight,i.fire(this.input,"awesomplete-highlight",{text:this.suggestions[this.index]}))},select:function(t,e){if(t?this.index=i.siblingIndex(t):t=this.ul.children[this.index],t){var n=this.suggestions[this.index];i.fire(this.input,"awesomplete-select",{text:n,origin:e||t})&&(this.replace(n),this.close({reason:"select"}),i.fire(this.input,"awesomplete-selectcomplete",{text:n}))}},evaluate:function(){var e=this,i=this.input.value;i.length>=this.minChars&&this._list&&this._list.length>0?(this.index=-1,this.ul.innerHTML="",this.suggestions=this._list.map(function(n){return new t(e.data(n,i))}).filter(function(t){return e.filter(t,i)}),!1!==this.sort&&(this.suggestions=this.suggestions.sort(this.sort)),this.suggestions=this.suggestions.slice(0,this.maxItems),this.suggestions.forEach(function(t,n){e.ul.appendChild(e.item(t,i,n))}),0===this.ul.children.length?(this.status.textContent="No results found",this.close({reason:"nomatches"})):(this.open(),this.status.textContent=this.ul.children.length+" results found")):(this.close({reason:"nomatches"}),this.status.textContent="No results found")}},r.all=[],r.FILTER_CONTAINS=function(t,e){return RegExp(i.regExpEscape(e.trim()),"i").test(t)},r.FILTER_STARTSWITH=function(t,e){return RegExp("^"+i.regExpEscape(e.trim()),"i").test(t)},r.SORT_BYLENGTH=function(t,e){return t.length!==e.length?t.length-e.length:t<e?-1:1},r.CONTAINER=function(t){return i.create("div",{className:"awesomplete",around:t})},r.ITEM=function(t,e,n){return i.create("li",{innerHTML:""===e.trim()?t:t.replace(RegExp(i.regExpEscape(e.trim()),"gi"),"<mark>$&</mark>"),role:"option","aria-selected":"false",id:"awesomplete_list_"+this.count+"_item_"+n})},r.REPLACE=function(t){this.input.value=t.value},r.DATA=function(t){return t},Object.defineProperty(t.prototype=Object.create(String.prototype),"length",{get:function(){return this.label.length}}),t.prototype.toString=t.prototype.valueOf=function(){return""+this.label};var o=Array.prototype.slice;i.create=function(t,e){var n=document.createElement(t);for(var s in e){var r=e[s];if("inside"===s)i(r).appendChild(n);else if("around"===s){var o=i(r);o.parentNode.insertBefore(n,o),n.appendChild(o),null!=o.getAttribute("autofocus")&&o.focus()}else s in n?n[s]=r:n.setAttribute(s,r)}return n},i.bind=function(t,e){if(t)for(var i in e){var n=e[i];i.split(/\s+/).forEach(function(e){t.addEventListener(e,n)})}},i.unbind=function(t,e){if(t)for(var i in e){var n=e[i];i.split(/\s+/).forEach(function(e){t.removeEventListener(e,n)})}},i.fire=function(t,e,i){var n=document.createEvent("HTMLEvents");n.initEvent(e,!0,!0);for(var s in i)n[s]=i[s];return t.dispatchEvent(n)},i.regExpEscape=function(t){return t.replace(/[-\\^$*+?.()|[\]{}]/g,"\\$&")},i.siblingIndex=function(t){for(var e=0;t=t.previousElementSibling;e++);return e},"undefined"!=typeof self&&(self.Awesomplete=r),"undefined"!=typeof Document&&("loading"!==document.readyState?s():document.addEventListener("DOMContentLoaded",s)),r.$=i,r.$$=n,"object"==typeof module&&module.exports&&(module.exports=r)}();
+//# sourceMappingURL=awesomplete.min.js.map
diff --git a/core/modules/awesomplete_autocomplete/js/awesomplete.min.js.map b/core/modules/awesomplete_autocomplete/js/awesomplete.min.js.map
new file mode 100644
index 0000000000..6ad1411ee2
--- /dev/null
+++ b/core/modules/awesomplete_autocomplete/js/awesomplete.min.js.map
@@ -0,0 +1 @@
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Probably both. :P\n * @author Lea Verou http://leaverou.github.io/awesomplete\n * MIT license\n */\n\n(function () {\n\nvar _ = function (input, o) {\n\tvar me = this;\n\n    // Keep track of number of instances for unique IDs\n    _.count = (_.count || 0) + 1;\n    this.count = _.count;\n\n\t// Setup\n\n\tthis.isOpened = false;\n\n\tthis.input = $(input);\n\tthis.input.setAttribute(\"autocomplete\", \"off\");\n\tthis.input.setAttribute(\"aria-expanded\", \"false\");\n\tthis.input.setAttribute(\"aria-owns\", \"awesomplete_list_\" + this.count);\n\tthis.input.setAttribute(\"role\", \"combobox\");\n\n\t// store constructor options in case we need to distinguish\n\t// between default and customized behavior later on\n\tthis.options = o = o || {};\n\n\tconfigure(this, {\n\t\tminChars: 2,\n\t\tmaxItems: 10,\n\t\tautoFirst: false,\n\t\tdata: _.DATA,\n\t\tfilter: _.FILTER_CONTAINS,\n\t\tsort: o.sort === false ? false : _.SORT_BYLENGTH,\n\t\tcontainer: _.CONTAINER,\n\t\titem: _.ITEM,\n\t\treplace: _.REPLACE,\n\t\ttabSelect: false\n\t}, o);\n\n\tthis.index = -1;\n\n\t// Create necessary elements\n\n\tthis.container = this.container(input);\n\n\tthis.ul = $.create(\"ul\", {\n\t\thidden: \"hidden\",\n        role: \"listbox\",\n        id: \"awesomplete_list_\" + this.count,\n\t\tinside: this.container\n\t});\n\n\tthis.status = $.create(\"span\", {\n\t\tclassName: \"visually-hidden\",\n\t\trole: \"status\",\n\t\t\"aria-live\": \"assertive\",\n        \"aria-atomic\": true,\n        inside: this.container,\n        textContent: this.minChars != 0 ? (\"Type \" + this.minChars + \" or more characters for results.\") : \"Begin typing for results.\"\n\t});\n\n\t// Bind events\n\n\tthis._events = {\n\t\tinput: {\n\t\t\t\"input\": this.evaluate.bind(this),\n\t\t\t\"blur\": this.close.bind(this, { reason: \"blur\" }),\n\t\t\t\"keydown\": function(evt) {\n\t\t\t\tvar c = evt.keyCode;\n\n\t\t\t\t// If the dropdown `ul` is in view, then act on keydown for the following keys:\n\t\t\t\t// Enter / Esc / Up / Down\n\t\t\t\tif(me.opened) {\n\t\t\t\t\tif (c === 13 && me.selected) { // Enter\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme.select();\n\t\t\t\t\t}\n\t\t\t\t\telse if (c === 9 && me.selected && me.tabSelect) {\n\t\t\t\t\t\tme.select();\n\t\t\t\t\t}\n\t\t\t\t\telse if (c === 27) { // Esc\n\t\t\t\t\t\tme.close({ reason: \"esc\" });\n\t\t\t\t\t}\n\t\t\t\t\telse if (c === 38 || c === 40) { // Down/Up arrow\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme[c === 38? \"previous\" : \"next\"]();\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t},\n\t\tform: {\n\t\t\t\"submit\": this.close.bind(this, { reason: \"submit\" })\n\t\t},\n\t\tul: {\n\t\t\t// Prevent the default mousedowm, which ensures the input is not blurred.\n\t\t\t// The actual selection will happen on click. This also ensures dragging the\n\t\t\t// cursor away from the list item will cancel the selection\n\t\t\t\"mousedown\": function(evt) {\n\t\t\t\tevt.preventDefault();\n\t\t\t},\n\t\t\t// The click event is fired even if the corresponding mousedown event has called preventDefault\n\t\t\t\"click\": function(evt) {\n\t\t\t\tvar li = evt.target;\n\n\t\t\t\tif (li !== this) {\n\n\t\t\t\t\twhile (li && !/li/i.test(li.nodeName)) {\n\t\t\t\t\t\tli = li.parentNode;\n\t\t\t\t\t}\n\n\t\t\t\t\tif (li && evt.button === 0) {  // Only select on left click\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t\tme.select(li, evt.target);\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n\n\t$.bind(this.input, this._events.input);\n\t$.bind(this.input.form, this._events.form);\n\t$.bind(this.ul, this._events.ul);\n\n\tif (this.input.hasAttribute(\"list\")) {\n\t\tthis.list = \"#\" + this.input.getAttribute(\"list\");\n\t\tthis.input.removeAttribute(\"list\");\n\t}\n\telse {\n\t\tthis.list = this.input.getAttribute(\"data-list\") || o.list || [];\n\t}\n\n\t_.all.push(this);\n};\n\n_.prototype = {\n\tset list(list) {\n\t\tif (Array.isArray(list)) {\n\t\t\tthis._list = list;\n\t\t}\n\t\telse if (typeof list === \"string\" && list.indexOf(\",\") > -1) {\n\t\t\t\tthis._list = list.split(/\\s*,\\s*/);\n\t\t}\n\t\telse { // Element or CSS selector\n\t\t\tlist = $(list);\n\n\t\t\tif (list && list.children) {\n\t\t\t\tvar items = [];\n\t\t\t\tslice.apply(list.children).forEach(function (el) {\n\t\t\t\t\tif (!el.disabled) {\n\t\t\t\t\t\tvar text = el.textContent.trim();\n\t\t\t\t\t\tvar value = el.value || text;\n\t\t\t\t\t\tvar label = el.label || text;\n\t\t\t\t\t\tif (value !== \"\") {\n\t\t\t\t\t\t\titems.push({ label: label, value: value });\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t});\n\t\t\t\tthis._list = items;\n\t\t\t}\n\t\t}\n\n\t\tif (document.activeElement === this.input) {\n\t\t\tthis.evaluate();\n\t\t}\n\t},\n\n\tget selected() {\n\t\treturn this.index > -1;\n\t},\n\n\tget opened() {\n\t\treturn this.isOpened;\n\t},\n\n\tclose: function (o) {\n\t\tif (!this.opened) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.input.setAttribute(\"aria-expanded\", \"false\");\n\t\tthis.ul.setAttribute(\"hidden\", \"\");\n\t\tthis.isOpened = false;\n\t\tthis.index = -1;\n\n\t\tthis.status.setAttribute(\"hidden\", \"\");\n\n\t\t$.fire(this.input, \"awesomplete-close\", o || {});\n\t},\n\n\topen: function () {\n\t\tthis.input.setAttribute(\"aria-expanded\", \"true\");\n\t\tthis.ul.removeAttribute(\"hidden\");\n\t\tthis.isOpened = true;\n\n\t\tthis.status.removeAttribute(\"hidden\");\n\n\t\tif (this.autoFirst && this.index === -1) {\n\t\t\tthis.goto(0);\n\t\t}\n\n\t\t$.fire(this.input, \"awesomplete-open\");\n\t},\n\n\tdestroy: function() {\n\t\t//remove events from the input and its form\n\t\t$.unbind(this.input, this._events.input);\n\t\t$.unbind(this.input.form, this._events.form);\n\n\t\t// cleanup container if it was created by Awesomplete but leave it alone otherwise\n\t\tif (!this.options.container) {\n\t\t\t//move the input out of the awesomplete container and remove the container and its children\n\t\t\tvar parentNode = this.container.parentNode;\n\n\t\t\tparentNode.insertBefore(this.input, this.container);\n\t\t\tparentNode.removeChild(this.container);\n\t\t}\n\n\t\t//remove autocomplete and aria-autocomplete attributes\n\t\tthis.input.removeAttribute(\"autocomplete\");\n\t\tthis.input.removeAttribute(\"aria-autocomplete\");\n\n\t\t//remove this awesomeplete instance from the global array of instances\n\t\tvar indexOfAwesomplete = _.all.indexOf(this);\n\n\t\tif (indexOfAwesomplete !== -1) {\n\t\t\t_.all.splice(indexOfAwesomplete, 1);\n\t\t}\n\t},\n\n\tnext: function () {\n\t\tvar count = this.ul.children.length;\n\t\tthis.goto(this.index < count - 1 ? this.index + 1 : (count ? 0 : -1) );\n\t},\n\n\tprevious: function () {\n\t\tvar count = this.ul.children.length;\n\t\tvar pos = this.index - 1;\n\n\t\tthis.goto(this.selected && pos !== -1 ? pos : count - 1);\n\t},\n\n\t// Should not be used, highlights specific item without any checks!\n\tgoto: function (i) {\n\t\tvar lis = this.ul.children;\n\n\t\tif (this.selected) {\n\t\t\tlis[this.index].setAttribute(\"aria-selected\", \"false\");\n\t\t}\n\n\t\tthis.index = i;\n\n\t\tif (i > -1 && lis.length > 0) {\n\t\t\tlis[i].setAttribute(\"aria-selected\", \"true\");\n\n\t\t\tthis.status.textContent = lis[i].textContent + \", list item \" + (i + 1) + \" of \" + lis.length;\n\n            this.input.setAttribute(\"aria-activedescendant\", this.ul.id + \"_item_\" + this.index);\n\n\t\t\t// scroll to highlighted element in case parent's height is fixed\n\t\t\tthis.ul.scrollTop = lis[i].offsetTop - this.ul.clientHeight + lis[i].clientHeight;\n\n\t\t\t$.fire(this.input, \"awesomplete-highlight\", {\n\t\t\t\ttext: this.suggestions[this.index]\n\t\t\t});\n\t\t}\n\t},\n\n\tselect: function (selected, origin) {\n\t\tif (selected) {\n\t\t\tthis.index = $.siblingIndex(selected);\n\t\t} else {\n\t\t\tselected = this.ul.children[this.index];\n\t\t}\n\n\t\tif (selected) {\n\t\t\tvar suggestion = this.suggestions[this.index];\n\n\t\t\tvar allowed = $.fire(this.input, \"awesomplete-select\", {\n\t\t\t\ttext: suggestion,\n\t\t\t\torigin: origin || selected\n\t\t\t});\n\n\t\t\tif (allowed) {\n\t\t\t\tthis.replace(suggestion);\n\t\t\t\tthis.close({ reason: \"select\" });\n\t\t\t\t$.fire(this.input, \"awesomplete-selectcomplete\", {\n\t\t\t\t\ttext: suggestion\n\t\t\t\t});\n\t\t\t}\n\t\t}\n\t},\n\n\tevaluate: function() {\n\t\tvar me = this;\n\t\tvar value = this.input.value;\n\n\t\tif (value.length >= this.minChars && this._list && this._list.length > 0) {\n\t\t\tthis.index = -1;\n\t\t\t// Populate list with options that match\n\t\t\tthis.ul.innerHTML = \"\";\n\n\t\t\tthis.suggestions = this._list\n\t\t\t\t.map(function(item) {\n\t\t\t\t\treturn new Suggestion(me.data(item, value));\n\t\t\t\t})\n\t\t\t\t.filter(function(item) {\n\t\t\t\t\treturn me.filter(item, value);\n\t\t\t\t});\n\n\t\t\tif (this.sort !== false) {\n\t\t\t\tthis.suggestions = this.suggestions.sort(this.sort);\n\t\t\t}\n\n\t\t\tthis.suggestions = this.suggestions.slice(0, this.maxItems);\n\n\t\t\tthis.suggestions.forEach(function(text, index) {\n\t\t\t\t\tme.ul.appendChild(me.item(text, value, index));\n\t\t\t\t});\n\n\t\t\tif (this.ul.children.length === 0) {\n\n                this.status.textContent = \"No results found\";\n\n\t\t\t\tthis.close({ reason: \"nomatches\" });\n\n\t\t\t} else {\n\t\t\t\tthis.open();\n\n                this.status.textContent = this.ul.children.length + \" results found\";\n\t\t\t}\n\t\t}\n\t\telse {\n\t\t\tthis.close({ reason: \"nomatches\" });\n\n                this.status.textContent = \"No results found\";\n\t\t}\n\t}\n};\n\n// Static methods/properties\n\n_.all = [];\n\n_.FILTER_CONTAINS = function (text, input) {\n\treturn RegExp($.regExpEscape(input.trim()), \"i\").test(text);\n};\n\n_.FILTER_STARTSWITH = function (text, input) {\n\treturn RegExp(\"^\" + $.regExpEscape(input.trim()), \"i\").test(text);\n};\n\n_.SORT_BYLENGTH = function (a, b) {\n\tif (a.length !== b.length) {\n\t\treturn a.length - b.length;\n\t}\n\n\treturn a < b? -1 : 1;\n};\n\n_.CONTAINER = function (input) {\n\treturn $.create(\"div\", {\n\t\tclassName: \"awesomplete\",\n\t\taround: input\n\t});\n}\n\n_.ITEM = function (text, input, item_id) {\n\tvar html = input.trim() === \"\" ? text : text.replace(RegExp($.regExpEscape(input.trim()), \"gi\"), \"<mark>$&</mark>\");\n\treturn $.create(\"li\", {\n\t\tinnerHTML: html,\n\t\t\"role\": \"option\",\n\t\t\"aria-selected\": \"false\",\n\t\t\"id\": \"awesomplete_list_\" + this.count + \"_item_\" + item_id\n\t});\n};\n\n_.REPLACE = function (text) {\n\tthis.input.value = text.value;\n};\n\n_.DATA = function (item/*, input*/) { return item; };\n\n// Private functions\n\nfunction Suggestion(data) {\n\tvar o = Array.isArray(data)\n\t  ? { label: data[0], value: data[1] }\n\t  : typeof data === \"object\" && \"label\" in data && \"value\" in data ? data : { label: data, value: data };\n\n\tthis.label = o.label || o.value;\n\tthis.value = o.value;\n}\nObject.defineProperty(Suggestion.prototype = Object.create(String.prototype), \"length\", {\n\tget: function() { return this.label.length; }\n});\nSuggestion.prototype.toString = Suggestion.prototype.valueOf = function () {\n\treturn \"\" + this.label;\n};\n\nfunction configure(instance, properties, o) {\n\tfor (var i in properties) {\n\t\tvar initial = properties[i],\n\t\t    attrValue = instance.input.getAttribute(\"data-\" + i.toLowerCase());\n\n\t\tif (typeof initial === \"number\") {\n\t\t\tinstance[i] = parseInt(attrValue);\n\t\t}\n\t\telse if (initial === false) { // Boolean options must be false by default anyway\n\t\t\tinstance[i] = attrValue !== null;\n\t\t}\n\t\telse if (initial instanceof Function) {\n\t\t\tinstance[i] = null;\n\t\t}\n\t\telse {\n\t\t\tinstance[i] = attrValue;\n\t\t}\n\n\t\tif (!instance[i] && instance[i] !== 0) {\n\t\t\tinstance[i] = (i in o)? o[i] : initial;\n\t\t}\n\t}\n}\n\n// Helpers\n\nvar slice = Array.prototype.slice;\n\nfunction $(expr, con) {\n\treturn typeof expr === \"string\"? (con || document).querySelector(expr) : expr || null;\n}\n\nfunction $$(expr, con) {\n\treturn slice.call((con || document).querySelectorAll(expr));\n}\n\n$.create = function(tag, o) {\n\tvar element = document.createElement(tag);\n\n\tfor (var i in o) {\n\t\tvar val = o[i];\n\n\t\tif (i === \"inside\") {\n\t\t\t$(val).appendChild(element);\n\t\t}\n\t\telse if (i === \"around\") {\n\t\t\tvar ref = $(val);\n\t\t\tref.parentNode.insertBefore(element, ref);\n\t\t\telement.appendChild(ref);\n\n\t\t\tif (ref.getAttribute(\"autofocus\") != null) {\n\t\t\t\tref.focus();\n\t\t\t}\n\t\t}\n\t\telse if (i in element) {\n\t\t\telement[i] = val;\n\t\t}\n\t\telse {\n\t\t\telement.setAttribute(i, val);\n\t\t}\n\t}\n\n\treturn element;\n};\n\n$.bind = function(element, o) {\n\tif (element) {\n\t\tfor (var event in o) {\n\t\t\tvar callback = o[event];\n\n\t\t\tevent.split(/\\s+/).forEach(function (event) {\n\t\t\t\telement.addEventListener(event, callback);\n\t\t\t});\n\t\t}\n\t}\n};\n\n$.unbind = function(element, o) {\n\tif (element) {\n\t\tfor (var event in o) {\n\t\t\tvar callback = o[event];\n\n\t\t\tevent.split(/\\s+/).forEach(function(event) {\n\t\t\t\telement.removeEventListener(event, callback);\n\t\t\t});\n\t\t}\n\t}\n};\n\n$.fire = function(target, type, properties) {\n\tvar evt = document.createEvent(\"HTMLEvents\");\n\n\tevt.initEvent(type, true, true );\n\n\tfor (var j in properties) {\n\t\tevt[j] = properties[j];\n\t}\n\n\treturn target.dispatchEvent(evt);\n};\n\n$.regExpEscape = function (s) {\n\treturn s.replace(/[-\\\\^$*+?.()|[\\]{}]/g, \"\\\\$&\");\n};\n\n$.siblingIndex = function (el) {\n\t/* eslint-disable no-cond-assign */\n\tfor (var i = 0; el = el.previousElementSibling; i++);\n\treturn i;\n};\n\n// Initialization\n\nfunction init() {\n\t$$(\"input.awesomplete\").forEach(function (input) {\n\t\tnew _(input);\n\t});\n}\n\n// Make sure to export Awesomplete on self when in a browser\nif (typeof self !== \"undefined\") {\n\tself.Awesomplete = _;\n}\n\n// Are we in a browser? Check for Document constructor\nif (typeof Document !== \"undefined\") {\n\t// DOM already loaded?\n\tif (document.readyState !== \"loading\") {\n\t\tinit();\n\t}\n\telse {\n\t\t// Wait for it\n\t\tdocument.addEventListener(\"DOMContentLoaded\", init);\n\t}\n}\n\n_.$ = $;\n_.$$ = $$;\n\n// Expose Awesomplete as a CJS module\nif (typeof module === \"object\" && module.exports) {\n\tmodule.exports = _;\n}\n\nreturn _;\n\n}());\n"]}
\ No newline at end of file
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
index e1f580fce7..205dcbabfa 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/EntityReference/EntityReferenceAutocompleteWidgetTest.php
@@ -2,10 +2,12 @@
 
 namespace Drupal\FunctionalJavascriptTests\EntityReference;
 
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
 use Drupal\Tests\field\Traits\EntityReferenceTestTrait;
 use Drupal\Tests\node\Traits\ContentTypeCreationTrait;
 use Drupal\Tests\node\Traits\NodeCreationTrait;
+use Drupal\Tests\taxonomy\Traits\TaxonomyTestTrait;
 
 /**
  * Tests the output of entity reference autocomplete widgets.
@@ -17,11 +19,19 @@ class EntityReferenceAutocompleteWidgetTest extends WebDriverTestBase {
   use ContentTypeCreationTrait;
   use EntityReferenceTestTrait;
   use NodeCreationTrait;
+  use TaxonomyTestTrait;
 
   /**
    * {@inheritdoc}
    */
-  public static $modules = ['node'];
+  public static $modules = ['node', 'taxonomy'];
+
+  /**
+   * The test vocabulary.
+   *
+   * @var \Drupal\taxonomy\VocabularyInterface
+   */
+  protected $vocabulary;
 
   /**
    * {@inheritdoc}
@@ -106,4 +116,71 @@ public function testEntityReferenceAutocompleteWidget() {
     $assert_session->pageTextNotContains('Page test');
   }
 
+  /**
+   * Test that spaces and commas work properly with autocomplete fields.
+   */
+  public function testSeparators() {
+    $this->createTagsFieldOnPage();
+
+    $term_commas = 'I,love,commas';
+    $term_spaces = 'Just a fan of spaces';
+    $term_commas_spaces = 'I dig both commas and spaces, apparently';
+
+    $this->createTerm($this->vocabulary, ['name' => $term_commas]);
+    $this->createTerm($this->vocabulary, ['name' => $term_spaces]);
+    $this->createTerm($this->vocabulary, ['name' => $term_commas_spaces]);
+
+    $this->drupalGet('node/add/page');
+    $page = $this->getSession()->getPage();
+    $assert_session = $this->assertSession();
+
+    $autocomplete_field = $assert_session->waitForElement('css', '[name="taxonomy_reference[target_id]"]');
+    $autocomplete_field->setValue('a');
+    $this->getSession()->getDriver()->keyDown($autocomplete_field->getXpath(), ' ');
+    $assert_session->waitOnAutocomplete();
+
+    $results = $page->findAll('css', '.ui-autocomplete li');
+    $this->assertCount(3, $results);
+
+    $assert_session->elementExists('css', '.ui-autocomplete li:contains("' . $term_commas_spaces . '")')->click();
+    $assert_session->pageTextNotContains($term_commas);
+    $assert_session->pageTextNotContains($term_spaces);
+    $current_value = $autocomplete_field->getValue();
+    $this->assertContains($term_commas_spaces, $current_value);
+  }
+
+  /**
+   * Create a tags field on the Page content type.
+   */
+  public function createTagsFieldOnPage() {
+    /** @var \Drupal\Core\Entity\EntityDisplayRepositoryInterface $display_repository */
+    $display_repository = \Drupal::service('entity_display.repository');
+
+    $field_name = 'taxonomy_reference';
+    $vocabulary = $this->createVocabulary();
+    $this->vocabulary = $vocabulary;
+
+    $handler_settings = [
+      'target_bundles' => [
+        $vocabulary->id() => $vocabulary->id(),
+      ],
+      'auto_create' => TRUE,
+    ];
+    $this->createEntityReferenceField('node', 'page', $field_name, 'Tags', 'taxonomy_term', 'default', $handler_settings, FieldStorageDefinitionInterface::CARDINALITY_UNLIMITED);
+    $display_repository->getFormDisplay('node', 'page')
+      ->setComponent($field_name, [
+        'type' => 'entity_reference_autocomplete_tags',
+        'settings' => [
+          'match_operator' => 'CONTAINS',
+        ],
+      ])
+      ->save();
+    $display_repository->getViewDisplay('node', 'page')
+      ->setComponent($field_name, [
+        'type' => 'entity_reference_label',
+        'weight' => 10,
+      ])
+      ->save();
+  }
+
 }
diff --git a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
index 3c76756bd5..e37cc77c5d 100644
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -140,6 +140,7 @@ public static function getSkippedDeprecations() {
       // This deprecation comes from behat/mink-browserkit-driver when updating
       // symfony/browser-kit to 4.3+.
       'The "Symfony\Component\BrowserKit\Response::getStatus()" method is deprecated since Symfony 4.3, use getStatusCode() instead.',
+      'The "core/jquery.ui.autocomplete" asset library is deprecated in drupal:8.8.0 and is removed from drupal:9.0.0. See https://www.drupal.org/project/drupal/issues/3076171',
     ];
   }
 
