1 files changed, 48 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/interaction/focus/the-autofocus-attribute/same-origin-autofocus.html b/testing/web-platform/tests/html/interaction/focus/the-autofocus-attribute/same-origin-autofocus.html
new file mode 100644
index 0000000000..1497a7d658
--- /dev/null
+++ b/testing/web-platform/tests/html/interaction/focus/the-autofocus-attribute/same-origin-autofocus.html
@@ -0,0 +1,48 @@
+<!doctype html>
+<html>
+<head>
+<meta charset=utf-8>
+<meta name="assert" content="`autofocus` should not work in the same origin iframe if there is a cross-origin iframe between the parent and the same origin iframe">
+<title>autofocus in the same origin grand child iframe</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/common/get-host-info.sub.js"></script>
+<script src="resources/utils.js"></script>
+</head>
+<body>
+  <iframe id="child" width="200" height="100"></iframe>
+  <script>
+    let parent_loaded = false;
+    let grand_child_loaded = false;
+
+    async_test(function(t) {
+      async function pingChildIfBothFramesLoaded() {
+        if (parent_loaded && grand_child_loaded) {
+          await waitUntilStableAutofocusState();
+          frames[0].postMessage("report_focus_state", "*");
+        }
+      }
+
+      window.addEventListener("load", t.step_func(event => {
+        parent_loaded = true;
+        pingChildIfBothFramesLoaded();
+      }));
+
+      window.addEventListener("message", t.step_func(event => {
+        if (event.data == "ready") {
+          grand_child_loaded = true;
+          pingChildIfBothFramesLoaded();
+        } else if (event.data == "grand_child_is_focused") {
+          assert_unreached("The grandchild iframe shouldn't get focus");
+        } else if (event.data == "grand_child_is_not_focused") {
+          t.done();
+        }
+      }));
+      document.getElementById("child").src =
+          get_host_info().HTTP_NOTSAMESITE_ORIGIN + "/html/interaction/focus/the-autofocus-attribute/resources/child-iframe.html";
+    }, "Autofocus should not work in the same origin grand child iframe");
+  </script>
+</body>
+</html>