1 files changed, 2 insertions, 1 deletions
diff --git a/testing/web-platform/tests/navigation-api/navigate-event/navigate-destination-getState-reload.html b/testing/web-platform/tests/navigation-api/navigate-event/navigate-destination-getState-reload.html
index ac6528ce7e..be33b8120d 100644
--- a/testing/web-platform/tests/navigation-api/navigate-event/navigate-destination-getState-reload.html
+++ b/testing/web-platform/tests/navigation-api/navigate-event/navigate-destination-getState-reload.html
@@ -16,7 +16,8 @@ async_test(t => {
       assert_equals(e.destination.key, "");
       assert_equals(e.destination.id, "");
       assert_equals(e.destination.index, -1);
-      assert_equals(e.sourceElement, null);
+      // NavigateEvent sourceElement is still in development, so test whether it is available.
+      if ("sourceElement" in e) assert_equals(e.sourceElement, null);
       e.intercept();
     });
     navigation.updateCurrentEntry({ state: navState });