diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 6056350..b21bfb1 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1460,6 +1460,12 @@ function drupal_pre_render_table(array $element) {
  *       )
  *     );
  *     @endcode
+ *   - footer: An array containing the table footers. Each element of the array
+ *     can be either a localized string or an associative array with the
+ *     following keys:
+ *     - "data": The localized summary information of the table column.
+ *     - Any HTML attributes, such as "colspan", to apply to the column footer
+ *       cell.
  *   - attributes: An array of HTML attributes to apply to the table tag.
  *   - caption: A localized string to use for the <caption> tag.
  *   - colgroups: An array of column groups. Each element of the array can be
@@ -1549,7 +1555,7 @@ function template_preprocess_table(&$variables) {
   $responsive_classes = array();
 
   // Format the table header:
-  $ts =array();
+  $ts = array();
   if (!empty($variables['header'])) {
     $ts = tablesort_init($variables['header']);
 
diff --git a/core/modules/system/templates/table.html.twig b/core/modules/system/templates/table.html.twig
index 48b0c12..4881e46 100644
--- a/core/modules/system/templates/table.html.twig
+++ b/core/modules/system/templates/table.html.twig
@@ -17,6 +17,10 @@
  *   - content: A localized string for the title of the column.
  *   - field: Field name (required for column sorting).
  *   - sort: Default sort order for this column ("asc" or "desc").
+ * - header: Table header cells. Each cell contains the following properties:
+ *   - attributes: HTML attributes to apply to the tag.
+ *   - content: A localized string for the title of the column.
+ *   - field: Field name (required for column sorting).
  * - sticky: A flag indicating whether to use a "sticky" table header.
  * - rows: Table rows. Each row contains the following properties:
  *   - attributes: HTML attributes to apply to the <tr> tag.
@@ -66,9 +70,9 @@
     <tfoot>
     <tr>
       {% for cell in footer %}
-        <{{ cell.tag }}{{ cell.attributes }}>
+        <td{{ cell.attributes }}>
           {{- cell.content -}}
-        </{{ cell.tag }}>
+        </td>
       {% endfor %}
     </tr>
     </tfoot>