diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index b65b71e..e5cc763 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2222,53 +2222,43 @@ function template_preprocess_item_list(&$variables) {
  *   - items: A list of items to render. Allowed values are strings or
  *     render arrays. Render arrays can specify list item attributes in the
  *     #wrapper_attributes property.
- *   - title: The title of the list.
  *   - list_type: The type of HTML list (e.g. "ul", "ol").
  *   - attributes: The attributes applied to the list element.
  */
 function theme_item_list($variables) {
   $items = $variables['items'];
-  $title = (string) $variables['title'];
   $list_type = $variables['list_type'];
-  $list_attributes = $variables['attributes'];
+  $attributes = $variables['attributes'];
+  $attributes['class'][] = 'item-list';
 
   $output = '';
   if ($items) {
-    $output .= '<' . $list_type . new Attribute($list_attributes) . '>';
+    $output .= '<' . $list_type . new Attribute($attributes) . '>';
 
     $num_items = count($items);
     $i = 0;
     foreach ($items as &$item) {
       $i++;
-      $attributes = array();
+      $item_attributes = array();
       if (is_array($item)) {
         if (isset($item['#wrapper_attributes'])) {
-          $attributes = $item['#wrapper_attributes'];
+          $item_attributes = $item['#wrapper_attributes'];
         }
         $item = drupal_render($item);
       }
-      $attributes['class'][] = ($i % 2 ? 'odd' : 'even');
+      // Add first, last, even & odd classes.
+      $item_attributes['class'][] = ($i % 2 ? 'odd' : 'even');
       if ($i == 1) {
-        $attributes['class'][] = 'first';
+        $item_attributes['class'][] = 'first';
       }
       if ($i == $num_items) {
-        $attributes['class'][] = 'last';
+        $item_attributes['class'][] = 'last';
       }
-      $output .= '<li' . new Attribute($attributes) . '>' . $item . '</li>';
+      $output .= '<li' . new Attribute($item_attributes) . '>' . $item . '</li>';
     }
     $output .= "</$list_type>";
   }
 
-  // Only output the list container and title, if there are any list items.
-  // Check to see whether the block title exists before adding a header.
-  // Empty headers are not semantic and present accessibility challenges.
-  if ($output !== '') {
-    if ($title !== '') {
-      $title = '<h3>' . $title . '</h3>';
-    }
-    $output = '<div class="item-list">' . $title . $output . '</div>';
-  }
-
   return $output;
 }
 
diff --git a/core/modules/simpletest/css/simpletest.module.css b/core/modules/simpletest/css/simpletest.module.css
index 86bd04b..d3a8afe 100644
--- a/core/modules/simpletest/css/simpletest.module.css
+++ b/core/modules/simpletest/css/simpletest.module.css
@@ -35,7 +35,7 @@ table#simpletest-form-table tr.simpletest-group label {
   display: inline;
 }
 
-div.message > div.item-list {
+div.message > ul.item-list {
   font-weight: normal;
 }
 
diff --git a/core/modules/system/css/system.theme.css b/core/modules/system/css/system.theme.css
index 46feb02..5d4281f 100644
--- a/core/modules/system/css/system.theme.css
+++ b/core/modules/system/css/system.theme.css
@@ -26,18 +26,15 @@ td.active {
 /**
  * Markup generated by theme_item_list().
  */
-.item-list .title {
-  font-weight: bold;
-}
-.item-list ul {
+ul.item-list {
   margin: 0 0 0.75em 0;
   padding: 0;
 }
-.item-list ul li {
+ul.item-list li {
   margin: 0 0 0.25em 1.5em; /* LTR */
   padding: 0;
 }
-[dir="rtl"] .item-list ul li {
+[dir="rtl"] ul.item-list li {
   margin: 0 1.5em 0.25em 0;
 }
 
@@ -153,11 +150,11 @@ abbr.form-required, abbr.tabledrag-changed, abbr.ajax-changed {
 /**
  * Markup generated by pager.html.twig.
  */
-.item-list .pager {
+ul.pager {
   clear: both;
   text-align: center;
 }
-.item-list .pager li {
+ul.pager li {
   background-image: none;
   display: inline;
   list-style-type: none;
diff --git a/core/modules/system/lib/Drupal/system/Tests/Theme/FunctionsTest.php b/core/modules/system/lib/Drupal/system/Tests/Theme/FunctionsTest.php
index 635883c..cf60107 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Theme/FunctionsTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Theme/FunctionsTest.php
@@ -93,32 +93,30 @@ function testItemList() {
       'f',
     );
 
-    $inner_b = '<div class="item-list"><ol id="blist">';
+    $inner_b = '<ol id="blist" class="item-list">';
     $inner_b .= '<li class="odd first">ba</li>';
     $inner_b .= '<li class="item-class-bb even last">bb</li>';
-    $inner_b .= '</ol></div>';
+    $inner_b .= '</ol>';
 
-    $inner_cb = '<div class="item-list"><ul>';
+    $inner_cb = '<ul class="item-list">';
     $inner_cb .= '<li class="odd first">cba</li>';
     $inner_cb .= '<li class="even last">cbb</li>';
-    $inner_cb .= '</ul></div>';
+    $inner_cb .= '</ul>';
 
-    $inner_c = '<div class="item-list"><ul id="clist">';
+    $inner_c = '<ul id="clist" class="item-list">';
     $inner_c .= '<li class="odd first">ca</li>';
     $inner_c .= '<li class="item-class-cb even">cb' . $inner_cb . '</li>';
     $inner_c .= '<li class="odd last">cc</li>';
-    $inner_c .= '</ul></div>';
+    $inner_c .= '</ul>';
 
-    $expected = '<div class="item-list">';
-    $expected .= '<h3>Some title</h3>';
-    $expected .= '<ul id="parentlist">';
+    $expected = '<ul id="parentlist" class="item-list">';
     $expected .= '<li class="odd first">a</li>';
     $expected .= '<li id="item-id-b" class="even">b' . $inner_b . '</li>';
     $expected .= '<li class="odd">c' . $inner_c . '</li>';
     $expected .= '<li id="item-id-d" class="even">d</li>';
     $expected .= '<li id="item-id-e" class="odd"></li>';
     $expected .= '<li class="even last">f</li>';
-    $expected .= '</ul></div>';
+    $expected .= '</ul>';
 
     $this->assertThemeOutput('item_list', $variables, $expected);
   }
diff --git a/core/modules/views/templates/views-view-summary.html.twig b/core/modules/views/templates/views-view-summary.html.twig
index 4d8ed8f..adf6c16 100644
--- a/core/modules/views/templates/views-view-summary.html.twig
+++ b/core/modules/views/templates/views-view-summary.html.twig
@@ -19,14 +19,12 @@
  * @ingroup themeable
  */
 #}
-<div class="item-list">
-  <ul class="views-summary">
-  {% for row in rows %}
-    <li><a href="{{ row.url }}"{{ row.attributes }}>{{ row.link }}</a>
-      {% if options.count %}
-        ({{ row.count }})
-      {% endif %}
-    </li>
-  {% endfor %}
-  </ul>
-</div>
+<ul class="views-summary item-list">
+{% for id, row in rows %}
+  <li><a href="{{ row.url }}"{{ row_classes[id] }}>{{ row.link }}</a>
+    {% if options.count %}
+      ({{ row.count }})
+    {% endif %}
+  </li>
+{% endfor %}
+</ul>
diff --git a/core/modules/views_ui/css/views_ui.admin.theme.css b/core/modules/views_ui/css/views_ui.admin.theme.css
index bbc7d16..19d47e6 100644
--- a/core/modules/views_ui/css/views_ui.admin.theme.css
+++ b/core/modules/views_ui/css/views_ui.admin.theme.css
@@ -1065,11 +1065,11 @@ ul#views-display-menu-tabs li.add ul.action-list li{
 
 /* @group HTML list */
 
-#views-live-preview .view-content > .item-list > ul {
+#views-live-preview .view-content > ul.item-list {
   list-style-position: outside;
   padding-left: 21px; /* LTR */
 }
-[dir="rtl"] #views-live-preview .view-content > .item-list > ul {
+[dir="rtl"] #views-live-preview .view-content > ul.item-list {
   padding-left: 0;
   padding-right: 21px;
 }
diff --git a/core/themes/bartik/css/style.css b/core/themes/bartik/css/style.css
index dab43ff..9161714 100644
--- a/core/themes/bartik/css/style.css
+++ b/core/themes/bartik/css/style.css
@@ -121,7 +121,7 @@ body,
 ul.contextual-links,
 ul.links,
 ul.primary,
-.item-list .pager,
+.pager,
 div.field-type-taxonomy-term-reference,
 div.messages,
 div.meta,
@@ -264,27 +264,27 @@ table ul.links li {
   font-size: 0.923em;
   text-shadow: 0 0 0 !important;
 }
-.item-list .pager {
+.pager {
   font-size: 0.929em;
 }
-.item-list .pager li {
+.pager li {
   padding: 0;
 }
-.item-list .pager a {
+.pager a {
   display: inline-block;
   padding: 10px 15px;
 }
-.item-list .pager .pager-first a {
+.pager .pager-first a {
   padding: 10px 10px 10px 0;
 }
-.item-list .pager .pager-previous a {
+.pager .pager-previous a {
   padding: 10px 0;
 }
-.item-list .pager .pager-current {
+.pager .pager-current {
   padding: 0 10px;
 }
-.item-list .pager .pager-next a,
-.item-list .pager .pager-last a {
+.pager .pager-next a,
+.pager .pager-last a {
   padding: 10px 0 10px 10px;
 }
 ul.menu li {
@@ -299,11 +299,11 @@ ul.menu li {
 [dir="rtl"] .region-content ol {
   padding: 2.5em 0 0.25em 0;
 }
-.item-list ul li {
+ul.item-list li {
   margin: 0;
   padding: 0.2em 0.5em 0 0; /* LTR */
 }
-[dir="rtl"] .item-list ul li {
+[dir="rtl"] ul.item-list li {
   padding: 0.2em 0 0 0.5em;
 }
 ul.tips {
@@ -459,21 +459,19 @@ h1#site-name {
   margin: 0;
   padding: 0;
 }
-.region-header #block-user-login div.item-list,
+.region-header #block-user-login ul.item-list,
 .region-header #block-user-login div.description {
   font-size: 0.916em;
   margin: 0;
 }
-.region-header #block-user-login div.item-list {
+.region-header #block-user-login ul.item-list {
   clear: both;
+  padding: 0;
+  line-height: 1;
 }
 .region-header #block-user-login div.description {
   display: inline;
 }
-.region-header #block-user-login .item-list ul {
-  padding: 0;
-  line-height: 1;
-}
 .region-header #block-user-login .item-list li {
   list-style: none;
   float: left; /* LTR */
diff --git a/core/themes/seven/style.css b/core/themes/seven/style.css
index 6d794d8..2ca1840 100644
--- a/core/themes/seven/style.css
+++ b/core/themes/seven/style.css
@@ -105,20 +105,18 @@ abbr,
 acronym {
   border-bottom: dotted 1px;
 }
-ul,
-.item-list ul {
+ul {
   list-style-type: disc;
   list-style-image: none;
   margin: 0.25em 0 0.25em 1.5em; /* LTR */
 }
-[dir="rtl"] ul,
-[dir="rtl"] .item-list ul {
+[dir="rtl"] ul {
   margin: 0.25em 1.5em 0.25em 0;
 }
-.item-list .pager li {
+.pager li {
   padding: 0.5em;
 }
-.item-list ul li,
+ul.item-list li,
 li.leaf,
 ul.menu li {
   list-style-type: disc;
@@ -134,12 +132,12 @@ ol {
 [dir="rtl"] ol {
   margin: 0.25em 2em 0.25em 0;
 }
-.item-list ul li.collapsed,
+ul.item-list li.collapsed,
 ul.menu li.collapsed {
   list-style-image:url(../../misc/menu-collapsed.png);
   list-style-type:disc;
 }
-.item-list ul li.expanded,
+ul.item-list li.expanded,
 ul.menu li.expanded {
   list-style-image:url(../../misc/menu-expanded.png);
   list-style-type:circle;
@@ -1380,7 +1378,7 @@ details.fieldset-no-legend {
 /* @group Lists */
 
 .views-admin ul.secondary,
-.views-admin .item-list ul {
+.views-admin ul.item-list {
   margin: 0;
   padding: 0;
 }