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diff --git a/web/core/modules/node/node.preview.es6.js b/web/core/modules/node/node.preview.es6.js
new file mode 100644
index 000000000..abd670acf
--- /dev/null
+++ b/web/core/modules/node/node.preview.es6.js
@@ -0,0 +1,94 @@
+/**
+ * @file
+ * Preview behaviors.
+ */
+
+(function ($, Drupal) {
+  /**
+   * Disables all non-relevant links in node previews.
+   *
+   * Destroys links (except local fragment identifiers such as href="#frag") in
+   * node previews to prevent users from leaving the page.
+   *
+   * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches confirmation prompt for clicking links in node preview mode.
+   * @prop {Drupal~behaviorDetach} detach
+   *   Detaches confirmation prompt for clicking links in node preview mode.
+   */
+  Drupal.behaviors.nodePreviewDestroyLinks = {
+    attach(context) {
+      function clickPreviewModal(event) {
+        // Only confirm leaving previews when left-clicking and user is not
+        // pressing the ALT, CTRL, META (Command key on the Macintosh keyboard)
+        // or SHIFT key.
+        if (event.button === 0 && !event.altKey && !event.ctrlKey && !event.metaKey && !event.shiftKey) {
+          event.preventDefault();
+          const $previewDialog = $(`<div>${Drupal.theme('nodePreviewModal')}</div>`).appendTo('body');
+          Drupal.dialog($previewDialog, {
+            title: Drupal.t('Leave preview?'),
+            buttons: [
+              {
+                text: Drupal.t('Cancel'),
+                click() {
+                  $(this).dialog('close');
+                },
+              }, {
+                text: Drupal.t('Leave preview'),
+                click() {
+                  window.top.location.href = event.target.href;
+                },
+              },
+            ],
+          }).showModal();
+        }
+      }
+
+      const $preview = $(context).find('.content').once('node-preview');
+      if ($(context).find('.node-preview-container').length) {
+        $preview.on('click.preview', 'a:not([href^=#], #edit-backlink, #toolbar-administration a)', clickPreviewModal);
+      }
+    },
+    detach(context, settings, trigger) {
+      if (trigger === 'unload') {
+        const $preview = $(context).find('.content').removeOnce('node-preview');
+        if ($preview.length) {
+          $preview.off('click.preview');
+        }
+      }
+    },
+  };
+
+  /**
+   * Switch view mode.
+   *
+   * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches automatic submit on `formUpdated.preview` events.
+   */
+  Drupal.behaviors.nodePreviewSwitchViewMode = {
+    attach(context) {
+      const $autosubmit = $(context).find('[data-drupal-autosubmit]').once('autosubmit');
+      if ($autosubmit.length) {
+        $autosubmit.on('formUpdated.preview', function () {
+          $(this.form).trigger('submit');
+        });
+      }
+    },
+  };
+
+  /**
+   * Theme function for node preview modal.
+   *
+   * @return {string}
+   *   Markup for the node preview modal.
+   */
+  Drupal.theme.nodePreviewModal = function () {
+    return `<p>${
+      Drupal.t('Leaving the preview will cause unsaved changes to be lost. Are you sure you want to leave the preview?')
+      }</p><small class="description">${
+      Drupal.t('CTRL+Left click will prevent this dialog from showing and proceed to the clicked link.')}</small>`;
+  };
+}(jQuery, Drupal));