diff --git a/core/modules/node/content_types.inc b/core/modules/node/content_types.inc
index 8aea2b7..c4933fd 100644
--- a/core/modules/node/content_types.inc
+++ b/core/modules/node/content_types.inc
@@ -75,19 +75,15 @@ function node_overview_types() {
 }
 
 /**
- * Preprocess variables for node-admin-overview.html.twig, a node type
- * description for the content type admin page.
+ * Prepares variables for node type description templates.
  *
- * @param $variables
+ * Default template: node-admin-overview.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - name: The human-readable name of the content type.
  *   - type: An object containing the 'type' (machine name) and 'description' of
  *     the content type.
- *
- * @return string
- *   An HTML-formatted string of the description for this node type.
- *
- * @ingroup themeable
  */
 function template_preprocess_node_admin_overview(&$variables) {
   $variables['name'] = check_plain($variables['name']);
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index 065500b..93c5f4c 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -1129,19 +1129,19 @@ function node_preprocess_block(&$variables) {
 }
 
 /**
- * Preprocess variables for node.html.twig.
+ * Prepares variables for node templates.
+ *
+ * Default template: node.html.twig.
  *
  * Most themes utilize their own copy of node.html.twig. The default is located
  * inside "core/modules/node/templates/node.html.twig". Look in there for the
  * full list of variables.
  *
- * @param $variables
+ * @param array $variables
  *   An associative array containing:
  *   - elements: An array of elements to display in view mode.
  *   - node: The node object.
  *   - view_mode: View mode; e.g., 'full', 'teaser'...
- *
- * @see node.html.twig
  */
 function template_preprocess_node(&$variables) {
   $variables['view_mode'] = $variables['elements']['#view_mode'];
@@ -1515,15 +1515,15 @@ function node_user_predelete($account) {
 }
 
 /**
- * Preprocess variables for node-search-admin.html.twig, the content ranking
- * part of the search settings admin page.
+ * Prepares variables for node search admin form templates.
+ *
+ * Default template: node-search-admin.html.twig.
  *
- * @param $variables
+ * @param array $variables
  *   An associative array containing:
  *   - form: A render element representing the form.
  *
  * @see node_search_admin()
- * @ingroup themeable
  */
 function template_preprocess_node_search_admin(&$variables) {
   $form = $variables['form'];
@@ -1943,14 +1943,15 @@ function node_get_recent($number = 10) {
 }
 
 /**
- * Preprocess variables for node-recent-content.html.twig, a list of recently
- * created content.
+ * Prepares variables for list of recent content templates.
  *
- * @param $variables
+ * Default template: node-recent-content.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - nodes: An array of recent node entities.
  *
- * @ingroup themeable
+ * @see template_preprocess_node_recent_content()
  */
 function template_preprocess_node_recent_block(&$variables) {
   $rows = array();
@@ -1995,14 +1996,15 @@ function template_preprocess_node_recent_block(&$variables) {
 }
 
 /**
- * Preprocess variables for node-recent-content.twig, a recent node to be
- * displayed in the recent content block.
+ * Prepares variables for recently created node templates.
+ *
+ * Default template: node-recent-content.twig.
  *
- * @param $variables
+ * @param array $variables
  *   An associative array containing:
  *   - node: A node entity.
  *
- * @ingroup themeable
+ * @see template_preprocess_node_recent_block()
  */
 function template_preprocess_node_recent_content(&$variables) {
   $node = $variables['node'];
diff --git a/core/modules/node/node.pages.inc b/core/modules/node/node.pages.inc
index fa2fc16..a67960d 100644
--- a/core/modules/node/node.pages.inc
+++ b/core/modules/node/node.pages.inc
@@ -56,16 +56,15 @@ function node_add_page() {
 }
 
 /**
- * Preprocess variables for node-add-list.html.twig, a list of available node
- * types for node creation.
+ * Prepares variables for list of available node types templates.
  *
- * @param $variables
+ * Default template: node-add-list.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - content: An array of content types.
  *
  * @see node_add_page()
- *
- * @ingroup themeable
  */
 function template_preprocess_node_add_list(&$variables) {
   if (!empty($variables['content'])) {
@@ -150,23 +149,22 @@ function node_preview(Node $node) {
 }
 
 /**
- * Preprocess variables for node-preview.html.twig, a node preview for display
- * during node creation and editing.
+ * Prepares variables for node preview templates.
  *
- * @param $variables
+ * Default template: node-preview.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - node: The node entity which is being previewed.
  *
  * @see NodeFormController::preview()
  * @see node_preview()
- *
- * @ingroup themeable
  */
 function template_preprocess_node_preview(&$variables) {
   $node = $variables['node'];
 
   // Render trimmed teaser version of the post.
-  $node_teaser = node_view(clone $node, 'teaser');
+  $node_teaser = node_view($node, 'teaser');
   $node_teaser['#attached']['library'][] = array('node', 'drupal.node.preview');
   $variables['teaser'] = $node_teaser;
   // Render full version of the post.
diff --git a/core/modules/node/templates/node.html.twig b/core/modules/node/templates/node.html.twig
index 9a574f2..4c708dd 100644
--- a/core/modules/node/templates/node.html.twig
+++ b/core/modules/node/templates/node.html.twig
@@ -82,7 +82,7 @@
 
   {{ title_prefix }}
   {% if not page %}
-    <h2><a href="{{ node_url }}" rel="bookmark">{{ label }}</a></h2>
+    <h2 {{ title_attributes }}><a href="{{ node_url }}" rel="bookmark">{{ label }}</a></h2>
   {% endif %}
   {{ title_suffix }}