1 files changed, 2 insertions, 1 deletions
diff --git a/testing/web-platform/tests/navigation-api/navigate-event/navigate-anchor-download.html b/testing/web-platform/tests/navigation-api/navigate-event/navigate-anchor-download.html
index d04245ec25..fbeeb69b95 100644
--- a/testing/web-platform/tests/navigation-api/navigate-event/navigate-anchor-download.html
+++ b/testing/web-platform/tests/navigation-api/navigate-event/navigate-anchor-download.html
@@ -25,7 +25,8 @@ for (const [tag, download_attr] of tests) {
       assert_equals(e.destination.key, "");
       assert_equals(e.destination.id, "");
       assert_equals(e.destination.index, -1);
-      assert_equals(e.sourceElement, a);
+      // NavigateEvent sourceElement is still in development, so test whether it is available.
+      if ("sourceElement" in e) assert_equals(e.sourceElement, a);
       e.preventDefault();
     });
     a.click();