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diff --git a/web/core/modules/toolbar/js/models/ToolbarModel.es6.js b/web/core/modules/toolbar/js/models/ToolbarModel.es6.js
new file mode 100644
index 000000000..90c69d0bd
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+++ b/web/core/modules/toolbar/js/models/ToolbarModel.es6.js
@@ -0,0 +1,153 @@
+/**
+ * @file
+ * A Backbone Model for the toolbar.
+ */
+
+(function (Backbone, Drupal) {
+  /**
+   * Backbone model for the toolbar.
+   *
+   * @constructor
+   *
+   * @augments Backbone.Model
+   */
+  Drupal.toolbar.ToolbarModel = Backbone.Model.extend(/** @lends Drupal.toolbar.ToolbarModel# */{
+
+    /**
+     * @type {object}
+     *
+     * @prop activeTab
+     * @prop activeTray
+     * @prop isOriented
+     * @prop isFixed
+     * @prop areSubtreesLoaded
+     * @prop isViewportOverflowConstrained
+     * @prop orientation
+     * @prop locked
+     * @prop isTrayToggleVisible
+     * @prop height
+     * @prop offsets
+     */
+    defaults: /** @lends Drupal.toolbar.ToolbarModel# */{
+
+      /**
+       * The active toolbar tab. All other tabs should be inactive under
+       * normal circumstances. It will remain active across page loads. The
+       * active item is stored as an ID selector e.g. '#toolbar-item--1'.
+       *
+       * @type {string}
+       */
+      activeTab: null,
+
+      /**
+       * Represents whether a tray is open or not. Stored as an ID selector e.g.
+       * '#toolbar-item--1-tray'.
+       *
+       * @type {string}
+       */
+      activeTray: null,
+
+      /**
+       * Indicates whether the toolbar is displayed in an oriented fashion,
+       * either horizontal or vertical.
+       *
+       * @type {bool}
+       */
+      isOriented: false,
+
+      /**
+       * Indicates whether the toolbar is positioned absolute (false) or fixed
+       * (true).
+       *
+       * @type {bool}
+       */
+      isFixed: false,
+
+      /**
+       * Menu subtrees are loaded through an AJAX request only when the Toolbar
+       * is set to a vertical orientation.
+       *
+       * @type {bool}
+       */
+      areSubtreesLoaded: false,
+
+      /**
+       * If the viewport overflow becomes constrained, isFixed must be true so
+       * that elements in the trays aren't lost off-screen and impossible to
+       * get to.
+       *
+       * @type {bool}
+       */
+      isViewportOverflowConstrained: false,
+
+      /**
+       * The orientation of the active tray.
+       *
+       * @type {string}
+       */
+      orientation: 'horizontal',
+
+      /**
+       * A tray is locked if a user toggled it to vertical. Otherwise a tray
+       * will switch between vertical and horizontal orientation based on the
+       * configured breakpoints. The locked state will be maintained across page
+       * loads.
+       *
+       * @type {bool}
+       */
+      locked: false,
+
+      /**
+       * Indicates whether the tray orientation toggle is visible.
+       *
+       * @type {bool}
+       */
+      isTrayToggleVisible: true,
+
+      /**
+       * The height of the toolbar.
+       *
+       * @type {number}
+       */
+      height: null,
+
+      /**
+       * The current viewport offsets determined by {@link Drupal.displace}. The
+       * offsets suggest how a module might position is components relative to
+       * the viewport.
+       *
+       * @type {object}
+       *
+       * @prop {number} top
+       * @prop {number} right
+       * @prop {number} bottom
+       * @prop {number} left
+       */
+      offsets: {
+        top: 0,
+        right: 0,
+        bottom: 0,
+        left: 0,
+      },
+    },
+
+    /**
+     * @inheritdoc
+     *
+     * @param {object} attributes
+     *   Attributes for the toolbar.
+     * @param {object} options
+     *   Options for the toolbar.
+     *
+     * @return {string|undefined}
+     *   Returns an error message if validation failed.
+     */
+    validate(attributes, options) {
+      // Prevent the orientation being set to horizontal if it is locked, unless
+      // override has not been passed as an option.
+      if (attributes.orientation === 'horizontal' && this.get('locked') && !options.override) {
+        return Drupal.t('The toolbar cannot be set to a horizontal orientation when it is locked.');
+      }
+    },
+  });
+}(Backbone, Drupal));