diff --git a/lib/util/xml_utils.js b/lib/util/xml_utils.js
index 543e986eb3..abe74880d6 100644
--- a/lib/util/xml_utils.js
+++ b/lib/util/xml_utils.js
@@ -397,6 +397,11 @@ shaka.util.XmlUtils = class {
       return null;
     }
 
+    // Cobalt browser doesn't support document.createNodeIterator.
+    if (!('createNodeIterator' in document)) {
+      return rootElem;
+    }
+
     // SECURITY: Verify that the document does not contain elements from the
     // HTML or SVG namespaces, which could trigger script execution and XSS.
     const iterator = document.createNodeIterator(