1 files changed, 13 insertions, 0 deletions
diff --git a/testing/web-platform/tests/js/builtins/Promise-incumbent-global-subsubframe.sub.html b/testing/web-platform/tests/js/builtins/Promise-incumbent-global-subsubframe.sub.html
new file mode 100644
index 0000000000..9edd9d278a
--- /dev/null
+++ b/testing/web-platform/tests/js/builtins/Promise-incumbent-global-subsubframe.sub.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<script>
+  document.domain = "{{host}}";
+  onmessage = function (e) {
+    parent.postMessage(
+      {
+        actual: e.origin,
+        expected: "{{location[scheme]}}://{{domains[www1]}}:{{ports[http][0]}}",
+        reason: "Incumbent should have been the caller of then()"
+      },
+      "*");
+  }
+</script>