1 files changed, 23 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-2.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-2.html
new file mode 100644
index 0000000000..bd7d92c0dd
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-2.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Check that sandboxed iframe cannot perform navigation on the top
+           frame when allow-top-navigation is not set</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <script>
+      // We are the main test page.  Open a popup, so that we can
+      // can experiment navigation of the top frame.
+      async_test(t => {
+        window.addEventListener("message", t.step_func_done(e => {
+          assert_equals(e.data, "cannot navigate");
+          e.source.close();
+        }));
+        window.open('support/load-into-the-iframe.html');
+      }, "Frames without `allow-top-navigation` should not be able to navigate the top frame.");
+    </script>
+  </body>
+</html>