diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index 124a060..d4e24a9 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -546,14 +546,9 @@ function node_theme_suggestions_node(array $variables) {
 function template_preprocess_node(&$variables) {
   $variables['view_mode'] = $variables['elements']['#view_mode'];
   // Provide a distinct $teaser boolean.
-  $variables['teaser'] = $variables['view_mode'] == 'teaser';
   $variables['node'] = $variables['elements']['#node'];
   /** @var \Drupal\node\NodeInterface $node */
   $node = $variables['node'];
-  $variables['date'] = drupal_render($variables['elements']['created']);
-  unset($variables['elements']['created']);
-  $variables['author_name'] = drupal_render($variables['elements']['uid']);
-  unset($variables['elements']['uid']);
 
   $variables['url'] = $node->url('canonical', array(
     'language' => $node->language(),
@@ -565,18 +560,14 @@ function template_preprocess_node(&$variables) {
   //   - The node is in preview and view mode is either 'full' or 'default'.
   $variables['page'] = ($variables['view_mode'] == 'full' && (node_is_page($node)) || (isset($node->in_preview) && in_array($node->preview_view_mode, array('full', 'default'))));
 
-  // Helpful $content variable for templates.
-  $variables += array('content' => array());
-  foreach (Element::children($variables['elements']) as $key) {
-    $variables['content'][$key] = $variables['elements'][$key];
-  }
-
   // Display post information only on certain node types.
   $node_type = $node->type->entity;
   // Used by RDF to add attributes around the author and date submitted.
-  $variables['author_attributes'] = new Attribute();
   $variables['display_submitted'] = $node_type->displaySubmitted();
   if ($variables['display_submitted']) {
+    $variables['author_attributes'] = new Attribute();
+    $variables['date'] = drupal_render($variables['elements']['created']);
+    $variables['author_name'] = drupal_render($variables['elements']['uid']);
     if (theme_get_setting('features.node_user_picture')) {
       // To change user picture settings (e.g. image style), edit the 'compact'
       // view mode on the User entity. Note that the 'compact' view mode might
@@ -584,6 +575,14 @@ function template_preprocess_node(&$variables) {
       $variables['author_picture'] = user_view($node->getOwner(), 'compact');
     }
   }
+  unset($variables['elements']['uid']);
+  unset($variables['elements']['created']);
+
+  // Helpful $content variable for templates.
+  $variables += array('content' => array());
+  foreach (Element::children($variables['elements']) as $key) {
+    $variables['content'][$key] = $variables['elements'][$key];
+  }
 
   // Add article ARIA role.
   $variables['attributes']['role'] = 'article';
diff --git a/core/modules/node/templates/node.html.twig b/core/modules/node/templates/node.html.twig
index a78fcb3..70c4869 100644
--- a/core/modules/node/templates/node.html.twig
+++ b/core/modules/node/templates/node.html.twig
@@ -16,13 +16,16 @@
  *   or print a subset such as {{ content.field_example }}. Use
  *   {{ content|without('field_example') }} to temporarily suppress the printing
  *   of a given child element.
- * - author_picture: The node author user entity, rendered using the "compact"
- *   view mode.
  * - metadata: Metadata for this node.
- * - date: Themed creation date field.
- * - author_name: Themed author name field.
  * - url: Direct URL of the current node.
  * - display_submitted: Whether submission information should be displayed.
+ *   If display_submitted is set, additional variables are prepared:
+ *    - author_picture: The node author user entity, rendered using the "compact"
+ *      view mode.
+ *    -  date: Themed creation date field.
+ *    -  author_name: Themed author name field.
+ *    - author_attributes: Same as attributes, except applied to the author of
+ *      the node that appears in the template.
  * - attributes: HTML attributes for the containing element.
  *   The attributes.class element may contain one or more of the following
  *   classes:
@@ -43,17 +46,15 @@
  *   tag that appears in the template.
  * - content_attributes: Same as attributes, except applied to the main
  *   content tag that appears in the template.
- * - author_attributes: Same as attributes, except applied to the author of
- *   the node tag that appears in the template.
  * - title_prefix: Additional output populated by modules, intended to be
  *   displayed in front of the main title tag that appears in the template.
  * - title_suffix: Additional output populated by modules, intended to be
  *   displayed after the main title tag that appears in the template.
  * - view_mode: View mode; for example, "teaser" or "full".
- * - teaser: Flag for the teaser state. Will be true if view_mode is 'teaser'.
  * - page: Flag for the full page state. Will be true if view_mode is 'full'.
  * - readmore: Flag for more state. Will be true if the teaser content of the
  *   node cannot hold the main body content.
+ * - is_front: Flag for front. Will be true when presented on the front page.
  * - logged_in: Flag for authenticated user status. Will be true when the
  *   current user is a logged-in member.
  * - is_admin: Flag for admin user status. Will be true when the current user
diff --git a/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php b/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
index 3fc3e34..7ffda02 100644
--- a/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
+++ b/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
@@ -49,6 +49,7 @@ function testPageCacheTags() {
     ));
     $author_2 = $this->drupalCreateUser();
     $node_2 = $this->drupalCreateNode(array(
+      'type' => 'article',
       'uid' => $author_2->id(),
       'title' => 'Node 2',
       'body' => array(
@@ -124,6 +125,8 @@ function testPageCacheTags() {
       'config:system.menu.tools',
       'config:system.menu.footer',
       'config:system.menu.main',
+      'user_view',
+      'comment_list',
     ));
   }
 
diff --git a/core/themes/bartik/bartik.theme b/core/themes/bartik/bartik.theme
index 145c15c..9f338af 100644
--- a/core/themes/bartik/bartik.theme
+++ b/core/themes/bartik/bartik.theme
@@ -87,7 +87,7 @@ function bartik_preprocess_maintenance_page(&$variables) {
 function bartik_preprocess_node(&$variables) {
   // Remove the "Add new comment" link on teasers or when the comment form is
   // displayed on the page.
-  if ($variables['teaser'] || !empty($variables['content']['comments']['comment_form'])) {
+  if ($variables['view_mode'] == 'teaser' || !empty($variables['content']['comments']['comment_form'])) {
     unset($variables['content']['links']['comment']['#links']['comment-add']);
   }
 }
diff --git a/core/themes/bartik/templates/node.html.twig b/core/themes/bartik/templates/node.html.twig
index b390681..2505649 100644
--- a/core/themes/bartik/templates/node.html.twig
+++ b/core/themes/bartik/templates/node.html.twig
@@ -1,7 +1,7 @@
 {#
 /**
  * @file
- * Bartik's theme implementation to display a node.
+ * Default theme implementation to display a node.
  *
  * Available variables:
  * - node: Full node entity.
@@ -16,13 +16,16 @@
  *   or print a subset such as {{ content.field_example }}. Use
  *   {{ content|without('field_example') }} to temporarily suppress the printing
  *   of a given child element.
- * - author_picture: The node author user entity, rendered using the "compact"
- *   view mode.
  * - metadata: Metadata for this node.
- * - date: Themed creation date field.
- * - author_name: Themed author name field.
  * - url: Direct URL of the current node.
  * - display_submitted: Whether submission information should be displayed.
+ *   If display_submitted is set, additional variables are prepared:
+ *    - author_picture: The node author user entity, rendered using the "compact"
+ *      view mode.
+ *    -  date: Themed creation date field.
+ *    -  author_name: Themed author name field.
+ *    - author_attributes: Same as attributes, except applied to the author of
+ *      the node that appears in the template.
  * - attributes: HTML attributes for the containing element.
  *   The attributes.class element may contain one or more of the following
  *   classes:
@@ -43,17 +46,15 @@
  *   tag that appears in the template.
  * - content_attributes: Same as attributes, except applied to the main
  *   content tag that appears in the template.
- * - author_attributes: Same as attributes, except applied to the author of
- *   the node tag that appears in the template.
  * - title_prefix: Additional output populated by modules, intended to be
  *   displayed in front of the main title tag that appears in the template.
  * - title_suffix: Additional output populated by modules, intended to be
  *   displayed after the main title tag that appears in the template.
  * - view_mode: View mode; for example, "teaser" or "full".
- * - teaser: Flag for the teaser state. Will be true if view_mode is 'teaser'.
  * - page: Flag for the full page state. Will be true if view_mode is 'full'.
  * - readmore: Flag for more state. Will be true if the teaser content of the
  *   node cannot hold the main body content.
+ * - is_front: Flag for front. Will be true when presented on the front page.
  * - logged_in: Flag for authenticated user status. Will be true when the
  *   current user is a logged-in member.
  * - is_admin: Flag for admin user status. Will be true when the current user