sandbox-inherited-from-initiator-response.html

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This WPT test may be referenced by the following Test IDs:
- /html/browsers/sandboxing/sandbox-inherited-from-initiator-response.html - WPT Dashboard Interop Dashboard

<!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>