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diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-3.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-3.html
new file mode 100644
index 0000000000..c3e5dc1fd6
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-3.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Check that sandboxed iframe can perform navigation on the top frame
+           when allow-top-navigation is set (even when
+           allow-top-navigation-by-user-activation is 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, "can navigate");
+          e.source.close();
+        }));
+        // Specifying both allow-top-navigation and
+        // allow-top-navigation-by-user-activation is a document conformance
+        // error: allow-top-navigation-by-user-activation will have no effect.
+        let sandbox = "allow-top-navigation allow-top-navigation-by-user-activation allow-scripts";
+        window.open("support/load-into-the-iframe.html?sandbox=" + sandbox);
+      }, "Frames with `allow-top-navigation` should be able to navigate the top frame even when `allow-top-navigation-by-user-activation` is set.");
+    </script>
+  </body>
+</html>