diff --git a/core/includes/common.inc b/core/includes/common.inc
index 46a9356..703b259 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -29,6 +29,7 @@
 use Drupal\Core\EventSubscriber\HtmlViewSubscriber;
 use Drupal\Core\Routing\GeneratorNotInitializedException;
 use Drupal\Core\Template\Attribute;
+use Drupal\Core\Template\Markup;
 use Drupal\Core\Render\Element;
 use Drupal\Core\Session\AnonymousUserSession;
 
@@ -3778,7 +3779,7 @@ function drupal_render(&$elements, $is_recursive_call = FALSE) {
   }
 
   $elements['#printed'] = TRUE;
-  return $elements['#markup'];
+  return new Markup($elements['#markup']);
 }
 
 /**
@@ -3806,7 +3807,7 @@ function drupal_render_children(&$element, $children_keys = NULL) {
       $output .= drupal_render($element[$key]);
     }
   }
-  return $output;
+  return new Markup($output);
 }
 
 /**
diff --git a/core/includes/form.inc b/core/includes/form.inc
index 1c6af1b..bb5386f 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -14,6 +14,7 @@
 use Drupal\Core\Language\Language;
 use Drupal\Core\Render\Element;
 use Drupal\Core\Template\Attribute;
+use Drupal\Core\Template\Markup;
 use Drupal\Core\Utility\Color;
 use Symfony\Component\HttpFoundation\RedirectResponse;
 
@@ -1031,7 +1032,7 @@ function template_preprocess_fieldset(&$variables) {
 
   $variables['prefix'] = isset($element['#field_prefix']) ? $element['#field_prefix'] : NULL;
   $variables['suffix'] = isset($element['#field_suffix']) ? $element['#field_suffix'] : NULL;
-  $variables['children'] = $element['#children'];
+  $variables['children'] = new Markup($element['#children']);
 
   // Build legend properties.
   $variables['legend'] = array();
@@ -2689,7 +2690,7 @@ function template_preprocess_form(&$variables) {
     $element['#attributes']['accept-charset'] = "UTF-8";
   }
   $variables['attributes'] = $element['#attributes'];
-  $variables['children'] = $element['#children'];
+  $variables['children'] = new Markup($element['#children']);
 }
 
 /**
@@ -2905,7 +2906,7 @@ function template_preprocess_form_element(&$variables) {
   $variables['label'] = array('#theme' => 'form_element_label');
   $variables['label'] += array_intersect_key($element, array_flip(array('#id', '#required', '#title', '#title_display')));
 
-  $variables['children'] = $element['#children'];
+  $variables['children'] = new Markup($element['#children']);
 }
 
 /**
diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index d45c2e5..3a3ce3d 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -17,6 +17,7 @@
 use Drupal\Core\Extension\Extension;
 use Drupal\Core\Extension\ExtensionNameLengthException;
 use Drupal\Core\Template\Attribute;
+use Drupal\Core\Template\Markup;
 use Drupal\Core\Template\RenderWrapper;
 use Drupal\Core\Theme\ThemeSettings;
 use Drupal\Component\Utility\NestedArray;
@@ -631,7 +632,8 @@ function _theme($hook, $variables = array()) {
 
   // restore path_to_theme()
   $theme_path = $temp;
-  return (string) $output;
+
+  return new Markup($output);
 }
 
 /**
@@ -1791,7 +1793,7 @@ function template_preprocess_container(&$variables) {
     $element['#attributes']['class'][] = 'form-wrapper';
   }
 
-  $variables['children'] = $element['#children'];
+  $variables['children'] = new Markup($element['#children']);
   $variables['attributes'] = $element['#attributes'];
 }
 
@@ -2078,7 +2080,7 @@ function template_preprocess_page(&$variables) {
 
   // Move some variables to the top level for themer convenience and template cleanliness.
   $variables['show_messages'] = $variables['page']['#show_messages'];
-  $variables['title'] = $variables['page']['#title'];
+  $variables['title'] = new Markup($variables['page']['#title']);
 
   foreach (system_region_list($GLOBALS['theme']) as $region_key => $region_name) {
     if (!isset($variables['page'][$region_key])) {
@@ -2108,7 +2110,7 @@ function template_preprocess_page(&$variables) {
     $variables['secondary_menu'] = theme_get_setting('features.secondary_menu') ? menu_secondary_menu() : array();
     $variables['action_links']   = menu_get_local_actions();
     $variables['tabs']           = menu_local_tabs();
-    $variables['feed_icons']     = drupal_get_feeds();
+    $variables['feed_icons']     = new Markup(drupal_get_feeds());
   }
   else {
     $variables['main_menu']      = array();
@@ -2316,7 +2318,7 @@ function template_preprocess_install_page(&$variables) {
  */
 function template_preprocess_region(&$variables) {
   // Create the $content variable that templates expect.
-  $variables['content'] = $variables['elements']['#children'];
+  $variables['content'] = new Markup($variables['elements']['#children']);
   $variables['region'] = $variables['elements']['#region'];
 
   $variables['attributes']['class'][] = 'region';
diff --git a/core/lib/Drupal/Core/CoreServiceProvider.php b/core/lib/Drupal/Core/CoreServiceProvider.php
index 1cd43a3..b04f22a 100644
--- a/core/lib/Drupal/Core/CoreServiceProvider.php
+++ b/core/lib/Drupal/Core/CoreServiceProvider.php
@@ -118,7 +118,7 @@ public static function registerTwig(ContainerBuilder $container) {
         'cache' => drupal_installation_attempted() ? FALSE : Settings::get('twig_cache', TRUE),
         // @todo Remove in followup issue
         // @see http://drupal.org/node/1712444.
-        'autoescape' => FALSE,
+        'autoescape' => TRUE,
         'debug' => Settings::get('twig_debug', FALSE),
         'auto_reload' => Settings::get('twig_auto_reload', NULL),
       ))
diff --git a/core/lib/Drupal/Core/Template/Attribute.php b/core/lib/Drupal/Core/Template/Attribute.php
index ead5d05..93e4340 100644
--- a/core/lib/Drupal/Core/Template/Attribute.php
+++ b/core/lib/Drupal/Core/Template/Attribute.php
@@ -31,7 +31,7 @@
  *  // Produces <cat class="cat black-cat white-cat black-white-cat" id="socks">
  * @endcode
  */
-class Attribute implements \ArrayAccess, \IteratorAggregate {
+class Attribute extends \Twig_Markup implements \ArrayAccess, \IteratorAggregate {
 
   /**
    * Stores the attribute data.
diff --git a/core/lib/Drupal/Core/Template/Markup.php b/core/lib/Drupal/Core/Template/Markup.php
new file mode 100644
index 0000000..fb53545
--- /dev/null
+++ b/core/lib/Drupal/Core/Template/Markup.php
@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Template\Markup.
+ */
+
+namespace Drupal\Core\Template;
+
+/**
+ * A class that wraps functions to call them while printing in a template.
+ *
+ * To use, one may pass in the function name as a string followed by an array of
+ * arguments to the constructor.
+ * @code
+ * $variables['scripts'] = new Markup('drupal_get_js', array('footer'));
+ * @endcode
+ */
+class Markup extends \Twig_Markup {
+
+  /**
+   * Constructs a Markup object.
+   *
+   * @param string $callback
+   *   The callback function name.
+   * @param array $args
+   *   The arguments to pass to the callback function.
+   */
+  public function __construct($content, $charset = 'UTF-8') {
+    $this->content = $content;
+    $this->charset = $charset;
+  }
+
+  /**
+   * Implements the magic __toString() method.
+   */
+  public function __toString() {
+    return (string) $this->render();
+  }
+
+  /**
+   * Renders the markup.
+   *
+   * @return string
+   *   The results of the callback function.
+   */
+  public function render() {
+    return $this->content;
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Template/RenderWrapper.php b/core/lib/Drupal/Core/Template/RenderWrapper.php
index 7d7770d..58888e6 100644
--- a/core/lib/Drupal/Core/Template/RenderWrapper.php
+++ b/core/lib/Drupal/Core/Template/RenderWrapper.php
@@ -16,7 +16,7 @@
  * $variables['scripts'] = new RenderWrapper('drupal_get_js', array('footer'));
  * @endcode
  */
-class RenderWrapper {
+class RenderWrapper extends \Twig_Markup  {
 
   /**
    * Stores the callback function to be called when rendered.
@@ -52,7 +52,7 @@ public function __construct($callback, array $args = array()) {
    * Implements the magic __toString() method.
    */
   public function __toString() {
-    return $this->render();
+    return (string) $this->render();
   }
 
   /**
diff --git a/core/modules/book/templates/book-node-export-html.html.twig b/core/modules/book/templates/book-node-export-html.html.twig
index 0efa9a7..57b5662 100644
--- a/core/modules/book/templates/book-node-export-html.html.twig
+++ b/core/modules/book/templates/book-node-export-html.html.twig
@@ -18,5 +18,5 @@
 <article id="node-{{ node.id }}" class="section-{{ depth }}">
   <h1 class="book-heading">{{ title }}</h1>
   {{ content }}
-  {{ children }}
+  {{ children|raw }}
 </article>
diff --git a/core/modules/color/templates/color-scheme-form.html.twig b/core/modules/color/templates/color-scheme-form.html.twig
index 6cfacbd..4d39743 100644
--- a/core/modules/color/templates/color-scheme-form.html.twig
+++ b/core/modules/color/templates/color-scheme-form.html.twig
@@ -22,5 +22,5 @@
   </div>
   {{ form }}
   <h2>{{ 'Preview'|t }}</h2>
-  {{ html_preview }}
+  {{ html_preview|raw }}
 </div>
diff --git a/core/modules/comment/templates/comment.html.twig b/core/modules/comment/templates/comment.html.twig
index 5fca73b..aafa668 100644
--- a/core/modules/comment/templates/comment.html.twig
+++ b/core/modules/comment/templates/comment.html.twig
@@ -79,8 +79,8 @@
   {{ title_suffix }}
 
   <footer>
-    {{ user_picture }}
-    <p class="submitted">{{ submitted }}</p>
+    {{ user_picture|raw }}
+    <p class="submitted">{{ submitted|raw }}</p>
 
     {#
       Indicate the semantic relationship between parent and child comments
@@ -91,7 +91,7 @@
       <p class="parent visually-hidden">{{ parent }}</p>
     {% endif %}
 
-    {{ permalink }}
+    {{ permalink|raw }}
   </footer>
 
   <div{{ content_attributes }}>
diff --git a/core/modules/filter/templates/filter-guidelines.html.twig b/core/modules/filter/templates/filter-guidelines.html.twig
index 88a3b47..ecf9b94 100644
--- a/core/modules/filter/templates/filter-guidelines.html.twig
+++ b/core/modules/filter/templates/filter-guidelines.html.twig
@@ -20,6 +20,6 @@
  */
 #}
 <div{{ attributes }}>
-  <h4 class="label">{{ format.name|escape }}</h4>
+  <h4 class="label">{{ format.name }}</h4>
   {{ tips }}
 </div>
diff --git a/core/modules/filter/templates/filter-tips.html.twig b/core/modules/filter/templates/filter-tips.html.twig
index d8f70cb..27a3943 100644
--- a/core/modules/filter/templates/filter-tips.html.twig
+++ b/core/modules/filter/templates/filter-tips.html.twig
@@ -36,7 +36,7 @@
     {% if tip.list|length %}
       <ul class="tips">
       {% for item in tip.list %}
-        <li{{ item.attributes }}>{{ item.tip }}</li>
+        <li{{ item.attributes }}>{{ item.tip|raw }}</li>
       {% endfor %}
       </ul>
     {% endif %}
diff --git a/core/modules/filter/templates/text-format-wrapper.html.twig b/core/modules/filter/templates/text-format-wrapper.html.twig
index f453971..c657117 100644
--- a/core/modules/filter/templates/text-format-wrapper.html.twig
+++ b/core/modules/filter/templates/text-format-wrapper.html.twig
@@ -11,7 +11,7 @@
  */
 #}
 <div class="text-format-wrapper form-item">
-  {{ children }}
+  {{ children|raw }}
   {% if description %}
     <div class="description">{{ description }}</div>
   {% endif %}
diff --git a/core/modules/node/templates/node.html.twig b/core/modules/node/templates/node.html.twig
index ae1162e..2b47e64 100644
--- a/core/modules/node/templates/node.html.twig
+++ b/core/modules/node/templates/node.html.twig
@@ -88,7 +88,7 @@
   {% if display_submitted %}
     <footer>
       {{ user_picture }}
-      <p class="submitted">{{ submitted }}</p>
+      <p class="submitted">{{ submitted|raw }}</p>
     </footer>
   {% endif %}
 
diff --git a/core/modules/system/templates/breadcrumb.html.twig b/core/modules/system/templates/breadcrumb.html.twig
index 5f322f9..d36a426 100644
--- a/core/modules/system/templates/breadcrumb.html.twig
+++ b/core/modules/system/templates/breadcrumb.html.twig
@@ -14,7 +14,7 @@
     <h2 class="visually-hidden">{{ 'You are here'|t }}</h2>
     <ol>
     {% for item in breadcrumb %}
-      <li>{{ item }}</li>
+      <li>{{ item|raw }}</li>
     {% endfor %}
     </ol>
   </nav>
diff --git a/core/modules/system/templates/checkboxes.html.twig b/core/modules/system/templates/checkboxes.html.twig
index 00384d3..d38a918 100644
--- a/core/modules/system/templates/checkboxes.html.twig
+++ b/core/modules/system/templates/checkboxes.html.twig
@@ -14,4 +14,4 @@
  @todo: remove this file once http://drupal.org/node/1819284 is resolved.
  This is identical to core/modules/system/templates/container.html.twig
 #}
-<div{{ attributes }}>{{ children }}</div>
+<div{{ attributes }}>{{ children|raw }}</div>
diff --git a/core/modules/system/templates/container.html.twig b/core/modules/system/templates/container.html.twig
index a643e19..7800b64 100644
--- a/core/modules/system/templates/container.html.twig
+++ b/core/modules/system/templates/container.html.twig
@@ -15,4 +15,4 @@
  * @ingroup themeable
  */
 #}
-<div{{ attributes }}>{{ children }}</div>
+<div{{ attributes }}>{{ children|raw }}</div>
diff --git a/core/modules/system/templates/datetime.html.twig b/core/modules/system/templates/datetime.html.twig
index 25ef788..183b834 100644
--- a/core/modules/system/templates/datetime.html.twig
+++ b/core/modules/system/templates/datetime.html.twig
@@ -25,5 +25,4 @@
  * @see http://www.w3.org/TR/html5-author/the-time-element.html#attr-time-datetime
  */
 #}
-{# @todo Revisit once http://drupal.org/node/1825952 is resolved. #}
-<time{{ attributes }}>{{ html ? text|raw : text|escape }}</time>
+<time{{ attributes }}>{{ html ? text|raw : text }}</time>
diff --git a/core/modules/system/templates/details.html.twig b/core/modules/system/templates/details.html.twig
index 17ea820..6283dc2 100644
--- a/core/modules/system/templates/details.html.twig
+++ b/core/modules/system/templates/details.html.twig
@@ -17,17 +17,17 @@
 #}
 <details{{ attributes }}>
   {%- if title -%}
-    <summary{{ summary_attributes }}>{{ title }}</summary>
+    <summary{{ summary_attributes }}>{{ title|raw }}</summary>
   {%- endif -%}
   <div class="details-wrapper">
     {%- if description -%}
-      <div class="details-description">{{ description }}</div>
+      <div class="details-description">{{ description|raw }}</div>
     {%- endif -%}
     {%- if children -%}
-      {{ children }}
+      {{ children|raw }}
     {%- endif -%}
     {%- if value -%}
-      {{ value }}
+      {{ value|raw }}
     {%- endif -%}
   </div>
 </details>
diff --git a/core/modules/system/templates/dropbutton-wrapper.html.twig b/core/modules/system/templates/dropbutton-wrapper.html.twig
index ca0ff7e..d92bb6e 100644
--- a/core/modules/system/templates/dropbutton-wrapper.html.twig
+++ b/core/modules/system/templates/dropbutton-wrapper.html.twig
@@ -16,7 +16,7 @@
   {% spaceless %}
     <div class="dropbutton-wrapper">
       <div class="dropbutton-widget">
-        {{ children }}
+        {{ children|raw }}
       </div>
     </div>
   {% endspaceless %}
diff --git a/core/modules/system/templates/fieldset.html.twig b/core/modules/system/templates/fieldset.html.twig
index 9e4fe68..f7fed3a 100644
--- a/core/modules/system/templates/fieldset.html.twig
+++ b/core/modules/system/templates/fieldset.html.twig
@@ -31,7 +31,7 @@
     {% if prefix %}
       <span class="field-prefix">{{ prefix }}</span>
     {% endif %}
-    {{ children }}
+    {{ children|raw }}
     {% if suffix %}
       <span class="field-suffix">{{ suffix }}</span>
     {% endif %}
diff --git a/core/modules/system/templates/form-element.html.twig b/core/modules/system/templates/form-element.html.twig
index ea4d90f..bf9b76f 100644
--- a/core/modules/system/templates/form-element.html.twig
+++ b/core/modules/system/templates/form-element.html.twig
@@ -43,7 +43,7 @@
   {% if prefix is not empty %}
     <span class="field-prefix">{{ prefix }}</span>
   {% endif %}
-  {{ children }}
+  {{ children|raw }}
   {% if suffix is not empty %}
     <span class="field-suffix">{{ suffix }}</span>
   {% endif %}
@@ -52,7 +52,7 @@
   {% endif %}
   {% if description.content %}
     <div{{ description.attributes }}>
-      {{ description.content }}
+      {{ description.content|raw }}
     </div>
   {% endif %}
 </div>
diff --git a/core/modules/system/templates/form.html.twig b/core/modules/system/templates/form.html.twig
index b95fe71..7d5fdc2 100644
--- a/core/modules/system/templates/form.html.twig
+++ b/core/modules/system/templates/form.html.twig
@@ -12,4 +12,4 @@
  * @ingroup themeable
  */
 #}
-<form{{ attributes }}><div>{{ children }}</div></form>
+<form{{ attributes }}><div>{{ children|raw }}</div></form>
diff --git a/core/modules/system/templates/item-list.html.twig b/core/modules/system/templates/item-list.html.twig
index 34e1802..8e0a385 100644
--- a/core/modules/system/templates/item-list.html.twig
+++ b/core/modules/system/templates/item-list.html.twig
@@ -26,7 +26,7 @@
     {%- if items -%}
       <{{ list_type }}{{ attributes }}>
         {%- for item in items -%}
-          <li{{ item.attributes }}>{{ item.value }}</li>
+          <li{{ item.attributes }}>{{ item.value|raw }}</li>
         {%- endfor -%}
       </{{ list_type }}>
     {%- else -%}
diff --git a/core/modules/system/templates/radios.html.twig b/core/modules/system/templates/radios.html.twig
index e397644..01725b7 100644
--- a/core/modules/system/templates/radios.html.twig
+++ b/core/modules/system/templates/radios.html.twig
@@ -12,4 +12,4 @@
  * @ingroup themeable
  */
 #}
-<div{{ attributes }}>{{ children }}</div>
+<div{{ attributes }}>{{ children|raw }}</div>
diff --git a/core/modules/system/templates/select.html.twig b/core/modules/system/templates/select.html.twig
index 21f32ac..6a24ffd 100644
--- a/core/modules/system/templates/select.html.twig
+++ b/core/modules/system/templates/select.html.twig
@@ -12,4 +12,4 @@
  * @ingroup themeable
  */
 #}
-<select{{ attributes }}>{{ options }}</select>
+<select{{ attributes }}>{{ options|raw }}</select>
diff --git a/core/modules/system/templates/status-messages.html.twig b/core/modules/system/templates/status-messages.html.twig
index 505eb20..e86df24 100644
--- a/core/modules/system/templates/status-messages.html.twig
+++ b/core/modules/system/templates/status-messages.html.twig
@@ -34,11 +34,11 @@
       {% if messages|length > 1 %}
         <ul class="messages__list">
           {% for message in messages %}
-            <li class="messages__item">{{ message }}</li>
+            <li class="messages__item">{{ message|raw }}</li>
           {% endfor %}
         </ul>
       {% else %}
-        {{ messages.0 }}
+        {{ messages.0|raw }}
       {% endif %}
     {% if type == 'error' %}
       </div>
diff --git a/core/modules/system/templates/vertical-tabs.html.twig b/core/modules/system/templates/vertical-tabs.html.twig
index 5b7298b..98fe6d6 100644
--- a/core/modules/system/templates/vertical-tabs.html.twig
+++ b/core/modules/system/templates/vertical-tabs.html.twig
@@ -12,4 +12,4 @@
  * @ingroup themeable
  */
 #}
-<div data-vertical-tabs-panes{{ attributes }}>{{ children }}</div>
+<div data-vertical-tabs-panes{{ attributes }}>{{ children|Raw }}</div>
diff --git a/core/modules/views/templates/views-view-grid.html.twig b/core/modules/views/templates/views-view-grid.html.twig
index a5a813c..bfadb8e 100644
--- a/core/modules/views/templates/views-view-grid.html.twig
+++ b/core/modules/views/templates/views-view-grid.html.twig
@@ -31,7 +31,7 @@
   <div{{ row.attributes }}>
     {% for column in row.content %}
     <div{{ column.attributes }}>
-      {{ column.content }}
+      {{ column.content|raw }}
     </div>
     {% endfor %}
   </div>
@@ -41,7 +41,7 @@
   <div{{ column.attributes }}>
     {% for row in column.content %}
       <div{{ row.attributes }}>
-        {{ row.content }}
+        {{ row.content|raw }}
       </div>
     {% endfor %}
     </div>
diff --git a/core/modules/views/templates/views-view-table.html.twig b/core/modules/views/templates/views-view-table.html.twig
index 6b0b26c..7b1f280 100644
--- a/core/modules/views/templates/views-view-table.html.twig
+++ b/core/modules/views/templates/views-view-table.html.twig
@@ -51,7 +51,7 @@
       <tr>
         {% for column in header %}
           <th{{ column.attributes }} scope="col">
-            {{ column.content }}
+            {{ column.content|raw }}
           </th>
         {% endfor %}
       </tr>
@@ -62,7 +62,7 @@
       <tr{{ row.attributes }}>
         {% for column in row.columns %}
           <td{{ column.attributes }}>
-            {{ column.content }}
+            {{ column.content|raw }}
           </td>
         {% endfor %}
       </tr>
diff --git a/core/modules/views_ui/templates/views-ui-container.html.twig b/core/modules/views_ui/templates/views-ui-container.html.twig
index d45b158..3010a6c 100644
--- a/core/modules/views_ui/templates/views-ui-container.html.twig
+++ b/core/modules/views_ui/templates/views-ui-container.html.twig
@@ -12,4 +12,4 @@
  * @ingroup themeable
  */
 #}
-<div{{ attributes }}>{{ children }}</div>
+<div{{ attributes }}>{{ children|raw }}</div>
diff --git a/core/themes/bartik/templates/comment.html.twig b/core/themes/bartik/templates/comment.html.twig
index d2c4584..88e1db4 100644
--- a/core/themes/bartik/templates/comment.html.twig
+++ b/core/themes/bartik/templates/comment.html.twig
@@ -66,17 +66,17 @@
 
   <header class="comment-header">
     <div class="attribution">
-      {{ user_picture }}
+      {{ user_picture|raw }}
 
       <div class="submitted">
         <p class="commenter-name">
-          {{ author }}
+          {{ author|raw }}
         </p>
         <p class="comment-time">
-          {{ created }}
+          {{ created|raw }}
         </p>
         <p class="comment-permalink">
-          {{ permalink }}
+          {{ permalink|raw }}
         </p>
         {#
           // Indicate the semantic relationship between parent and child comments
@@ -103,7 +103,7 @@
     <span class="hidden new" data-comment-timestamp="{{ new_indicator_timestamp }}"></span>
 
     {{ title_prefix }}
-    <h3{{ title_attributes }}>{{ title }}</h3>
+    <h3{{ title_attributes }}>{{ title|raw }}</h3>
     {{ title_suffix }}
 
     <div{{ content_attributes }}>
diff --git a/core/themes/bartik/templates/node.html.twig b/core/themes/bartik/templates/node.html.twig
index 2848899..4358954 100644
--- a/core/themes/bartik/templates/node.html.twig
+++ b/core/themes/bartik/templates/node.html.twig
@@ -83,7 +83,7 @@
     {% if display_submitted %}
       <div class="meta submitted">
         {{ user_picture }}
-        {{ submitted }}
+        {{ submitted|raw }}
       </div>
     {% endif %}
   </header>
diff --git a/core/themes/engines/twig/twig.engine b/core/themes/engines/twig/twig.engine
index 1595bf8..e5847cc 100644
--- a/core/themes/engines/twig/twig.engine
+++ b/core/themes/engines/twig/twig.engine
@@ -6,6 +6,7 @@
  */
 
 use Drupal\Core\Extension\Extension;
+use Drupal\Core\Template\Markup;
 
 /**
  * Implements hook_theme().
@@ -138,7 +139,7 @@ function twig_render_var($arg) {
 
   if (is_object($arg)) {
     if (method_exists($arg, '__toString')) {
-      return (string) $arg;
+      return new $arg;
     }
     throw new Exception(t('Object of type "@class" cannot be printed.', array('@class' => get_class($arg))));
   }