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-rw-r--r--testing/web-platform/tests/navigation-api/navigate-event/navigate-form-traverse.html3
1 files changed, 2 insertions, 1 deletions
diff --git a/testing/web-platform/tests/navigation-api/navigate-event/navigate-form-traverse.html b/testing/web-platform/tests/navigation-api/navigate-event/navigate-form-traverse.html
index b9665c8056..72b8dc36ac 100644
--- a/testing/web-platform/tests/navigation-api/navigate-event/navigate-form-traverse.html
+++ b/testing/web-platform/tests/navigation-api/navigate-event/navigate-form-traverse.html
@@ -12,7 +12,8 @@ async_test(t => {
iframe.contentWindow.navigation.onnavigate = t.step_func(e => {
assert_equals(e.navigationType, "push");
assert_not_equals(e.formData, null);
- 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);
iframe.onload = t.step_func(() => {
// Avoid the replace behavior that occurs if you navigate during the load handler