diff --git a/core/misc/tabledrag.js b/core/misc/tabledrag.js
index c3a0f5a..c353f29 100644
--- a/core/misc/tabledrag.js
+++ b/core/misc/tabledrag.js
@@ -1506,6 +1506,14 @@
      * @return {string}
      */
     tableDragChangedWarning: function () {
+    var text = Drupal.t('!changeMarker Changes made in this table will not be saved until the form is submitted.', {
+      '!changeMarker': Drupal.theme('tableDragChangedMarker')
+    });
+    // Announce the changes.
+    Drupal.announce(text);
+
+    return '<div class="tabledrag-changed-warning messages warning">' + text + '</div>';
+
       return '<div class="tabledrag-changed-warning messages messages--warning" role="alert">' + Drupal.theme('tableDragChangedMarker') + ' ' + Drupal.t('You have unsaved changes.') + '</div>';
     }
   });
diff --git a/core/modules/block/js/block.js b/core/modules/block/js/block.js
index e5c0907..c81cfa8 100644
--- a/core/modules/block/js/block.js
+++ b/core/modules/block/js/block.js
@@ -141,4 +141,15 @@
     }
   };
 
+// A custom message for the blocks page specifically.
+Drupal.theme.tableDragChangedWarning = function () {
+  var text = Drupal.t('!changeMarker The changes to these blocks will not be saved until the %button button is clicked.', {
+    '!changeMarker': Drupal.theme('tableDragChangedMarker'),
+    '%button': Drupal.t('Save blocks')
+  });
+  Drupal.announce(text);
+
+  return '<div class="messages warning">' + text + '</div>';
+};
+
 })(jQuery, window);