Issue #3443461 by Gauravvvv, Mithun S, finnsky, ckrina: escapeAdmin.js...

/**

 * @file

 * Replaces the home link in toolbar with a back to site link.

 */

((Drupal, drupalSettings, once) => {

  /**

   * Information about the current page path.

   *

   * @type {object}

   */

  const pathInfo = drupalSettings.path;

  /**

   * The last non-administrative page visited in the current browser tab.

   *

   * @type {string}

   */

  const escapeAdminPath = sessionStorage.getItem('escapeAdminPath');

  /**

   * The window object representing the current browser tab.

   *

   * @type {Window}

   */

  const windowLocation = window.location;

  // Saves the last non-administrative page in the browser to be able to link

  // back to it when browsing administrative pages. If there is a destination

  // parameter there is not need to save the current path because the page is

  // loaded within an existing "workflow".

  if (

    !pathInfo.currentPathIsAdmin &&

    !/destination=/.test(windowLocation.search)

  ) {

    sessionStorage.setItem('escapeAdminPath', windowLocation);

  }

  /**

   * Replaces "Back to site" link url when appropriate.

   *

   * Back to site link points to the last non-administrative page the user

   * visited within the same browser tab.

   *

   * @type {Drupal~behavior}

   *

   * @prop {Drupal~behaviorAttach} attach

   *   Attaches the replacement functionality to the toolbar-escape-admin element.

   */

  Drupal.behaviors.escapeAdmin = {

    attach() {

      /**

       * Element with the data-toolbar-escape-admin attribute.

       *

       * @type {HTMLElement}

       */

      const toolbarEscape = once('escapeAdmin', '[data-toolbar-escape-admin]');

      if (

        toolbarEscape.length &&

        pathInfo.currentPathIsAdmin &&

        escapeAdminPath !== null

      ) {

        toolbarEscape[0].setAttribute('href', escapeAdminPath);

      }

    },

  };

})(Drupal, drupalSettings, once);

    base:

      css/base/admin-reset-styles.css: {}

internal.navigation.escapeAdmin:

  # Internal library. Do not depend on it outside core nor add core usage

  # beyond the Navigation module.

  version: VERSION

  js:

    js/escapeAdmin.js: {}

  dependencies:

    - core/drupal

    - core/drupalSettings

    - core/once

    - core/drupal.displace

navigation.layout:

  dependencies:

    - navigation/internal.navigation

    - navigation/internal.navigation.escapeAdmin

body-scroll-lock:

  version: VERSION