diff --git a/html/user-activation/propagation-sameorigin.html b/html/user-activation/propagation-sameorigin.html
index 61debbf948a3ee..94d15c2d415e34 100644
--- a/html/user-activation/propagation-sameorigin.html
+++ b/html/user-activation/propagation-sameorigin.html
@@ -62,9 +62,11 @@
                 assert_false(msg.hasBeenActive);
             }, "Grandchild frame initial state");
         } else if (msg.type == 'child-one-report') {
+            // Siblings (same or cross origin) should not be activated per spec
+            // Spec issue discussing: https://github.com/whatwg/html/issues/9831
             test(() => {
-                assert_true(msg.isActive);
-                assert_true(msg.hasBeenActive);
+                assert_false(msg.isActive);
+                assert_false(msg.hasBeenActive);
             }, "Child1 frame final state");
         } else if (msg.type == 'child-sameorigin-report') {
             // This msg was triggered by a user click.