diff -u b/core/modules/system/templates/table.html.twig b/core/modules/system/templates/table.html.twig
--- b/core/modules/system/templates/table.html.twig
+++ b/core/modules/system/templates/table.html.twig
@@ -28,9 +28,11 @@
  *     - attributes: Any HTML attributes, such as "colspan", to apply to the
  *       table cell.
  *     - content: The string to display in the table cell.
+ *     - active: A boolean indicating whether cell is active.
  * - footer: Table footer rows, in the same format as the rows variable.
  * - empty: The message to display in an extra row if table does not have
  *   any rows.
+ * - no_striping: A Boolean indicating that the row should receive no stirping.
  *
  * @see template_preprocess_table()
  *