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diff --git a/testing/web-platform/tests/html/browsers/sandboxing/sandbox-inherited-from-initiator-response.html b/testing/web-platform/tests/html/browsers/sandboxing/sandbox-inherited-from-initiator-response.html
new file mode 100644
index 0000000000..638f1ba783
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/sandboxing/sandbox-inherited-from-initiator-response.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Inherit sandbox flags from the initiator's response</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+// Check sandbox flags are properly inherited when a document initiate a
+// navigation inside another frame that it doesn't own directly.
+
+// This check the sandbox flags defined by the response (e.g. CSP sandbox). See
+// also the other test about sandbox flags inherited from the frame.
+// => sandbox-inherited-from-initiators-frame.html
+
+// Return a promise, resolving when |element| triggers |event_name| event.
+let future = (element, event_name) => {
+  return new Promise(resolve => {
+    element.addEventListener(event_name, event => resolve(event))
+  });
+};
+
+promise_test(async test => {
+  const iframe_1 = document.createElement("iframe");
+  const iframe_2 = document.createElement("iframe");
+
+  iframe_1.id = "iframe_1";
+  iframe_2.id = "iframe_2";
+
+  iframe_2.src =
+    "./resources/sandbox-inherited-from-initiator-response-helper.html";
+
+  // Insert |iframe_1|. It will load the initial empty document, with no sandbox
+  // flags.
+  const iframe_1_load_1 = future(iframe_1, "load");
+  document.body.appendChild(iframe_1);
+  await iframe_1_load_1;
+
+  // Insert |iframe_2|. It will load with sandbox flags. It will make |iframe_1|
+  // to navigate toward a data-url, which should inherit the sandbox flags.
+  const iframe_1_reply = future(window, "message");
+  document.body.appendChild(iframe_2);
+  const result = await iframe_1_reply;
+
+  assert_equals("sandboxed", result.data);
+})
+</script>