diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -16,6 +16,7 @@
 use Drupal\Component\Utility\Xss;
 use Drupal\Core\Config\Config;
 use Drupal\Core\Config\StorageException;
+use Drupal\Core\Render\SafeString;
 use Drupal\Core\Template\Attribute;
 use Drupal\Core\Theme\ThemeSettings;
 use Drupal\Component\Utility\NestedArray;
@@ -1066,6 +1067,73 @@
 }
 
 /**
+ * Prepares variables for inline list templates.
+ *
+ * Default template: inline-list.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - items: An array of items to be displayed in the list. Each item can be
+ *     either a string or a render array. If #type, #theme, or #markup
+ *     properties are not specified for child render arrays, they will be
+ *     inherited from the parent list, allowing callers to specify larger
+ *     nested lists without having to explicitly specify and repeat the
+ *     render properties for all nested child lists.
+ *   - separator: A string to separate list items.
+ *
+ * @see https://www.drupal.org/node/1842756
+ */
+function template_preprocess_inline_list(&$variables) {
+  foreach ($variables['items'] as &$item) {
+    $attributes = array();
+    // If the item value is an array, then it is a render array.
+    if (is_array($item)) {
+      // List items support attributes via the '#wrapper_attributes' property.
+      if (isset($item['#wrapper_attributes'])) {
+        $attributes = $item['#wrapper_attributes'];
+      }
+      // Determine whether there are any child elements in the item that are not
+      // fully-specified render arrays. If there are any, then the child
+      // elements present nested lists and we automatically inherit the render
+      // array properties of the current list to them.
+      foreach (Element::children($item) as $key) {
+        $child = &$item[$key];
+        // If this child element does not specify how it can be rendered, then
+        // we need to inherit the render properties of the current list.
+        if (!isset($child['#type']) && !isset($child['#theme']) && !isset($child['#markup'])) {
+          // Since inline-list.html.twig supports both strings and render arrays
+          // as items, the items of the nested list may have been specified as
+          // the child elements of the nested list, instead of #items. For
+          // convenience, we automatically move them into #items.
+          if (!isset($child['#items'])) {
+            // This is the same condition as in
+            // \Drupal\Core\Render\Element::children(), which cannot be used
+            // here, since it triggers an error on string values.
+            foreach ($child as $child_key => $child_value) {
+              if ($child_key[0] !== '#') {
+                $child['#items'][$child_key] = $child_value;
+                unset($child[$child_key]);
+              }
+            }
+          }
+          // Lastly, inherit the original theme variables of the current list.
+          $child['#theme'] = $variables['theme_hook_original'];
+        }
+      }
+    }
+
+    // Set the item's value and attributes for the template.
+    $item = array(
+      'value' => $item,
+      'attributes' => new Attribute($attributes),
+    );
+
+    // Since the separator may be user-specified, it must be sanitized.
+    $variables['separator'] = SafeString::create(Xss::filterAdmin($variables['separator']));
+  }
+}
+
+/**
  * Returns HTML for an indentation div; used for drag and drop tables.
  *
  * @param $variables
@@ -1726,8 +1794,8 @@
     'item_list' => array(
       'variables' => array('items' => array(), 'title' => '', 'list_type' => 'ul', 'attributes' => array(), 'empty' => NULL, 'context' => array()),
     ),
-    'item_list__inline' => array(
-      'variables' => array('items' => array(), 'title' => '', 'list_type' => 'inline', 'attributes' => array(), 'empty' => NULL, 'context' => array()),
+    'inline_list' => array(
+      'variables' => array('items' => array(), 'separator' => ', ', 'attributes' => array(), 'empty' => NULL, 'context' => array()),
     ),
     'feed_icon' => array(
       'variables' => array('url' => NULL, 'title' => NULL),
reverted:
--- b/core/modules/system/templates/item-list--inline.html.twig
+++ /dev/null
@@ -1,33 +0,0 @@
-{#
-/**
- * @file
- * Default theme implementation for an item list for comma separated inline.
- *
- * Available variables:
- * - items: A list of items. Each item contains:
- *   - attributes: HTML attributes to be applied to each list item.
- *   - value: The content of the list element.
- * - title: The title of the list.
- * - list_type: The tag for list element ("ul" or "ol").
- * - attributes: HTML attributes to be applied to the list.
- * - empty: A message to display when there are no items. Allowed value is a
- *   string or render array.
- *
- * @see template_preprocess_item_list()
- *
- * @ingroup themeable
- */
-#}
-{% if items or empty -%}
-  {%- if title is not empty -%}
-    <h3>{{ title }}</h3>
-  {%- endif -%}
-
-  {%- if items -%}
-    {%- for item in items -%}
-      {{ item }}{{ loop.last ? '' : ', ' }}
-    {%- endfor -%}
-  {%- else -%}
-    {{- empty -}}
-  {%- endif -%}
-{%- endif %}
diff -u b/core/modules/views_ui/src/ViewListBuilder.php b/core/modules/views_ui/src/ViewListBuilder.php
--- b/core/modules/views_ui/src/ViewListBuilder.php
+++ b/core/modules/views_ui/src/ViewListBuilder.php
@@ -109,7 +109,7 @@
         'tag' => $view->get('tag'),
         'path' => array(
           'data' => array(
-            '#theme' => 'item_list__inline',
+            '#theme' => 'inline_list',
             '#items' => $this->getDisplayPaths($view),
           ),
         ),
only in patch2:
unchanged:
--- /dev/null
+++ b/core/modules/system/templates/inline-list.html.twig
@@ -0,0 +1,29 @@
+{#
+/**
+ * @file
+ * Default theme implementation for an inline list of items.
+ *
+ * Available variables:
+ * - items: A list of items. Each item contains:
+ *   - attributes: HTML attributes to be applied to each list item.
+ *   - value: The content of the list element.
+ * - separator: A string to separate list items.
+ * - list_type: The tag for list element ("ul" or "ol").
+ * - attributes: HTML attributes to be applied to the list.
+ * - empty: A message to display when there are no items. Allowed value is a
+ *   string or render array.
+ *
+ * @see template_preprocess_inline_list()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if items or empty -%}
+  {%- if items -%}
+    {%- for item in items -%}
+      {{ item.value }}{{ loop.last ? '' : separator }}
+    {%- endfor -%}
+  {%- else -%}
+    {{- empty -}}
+  {%- endif -%}
+{%- endif %}