mozilla-release/testing/web-platform/tests/content-security-policy/inheritance/window.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<meta http-equiv="Content-Security-Policy" content="img-src 'none'">

<body>

<script>
  function wait_for_error_from_window(w, test) {
    window.addEventListener('message', test.step_func(e => {
      if (e.source != w)
        return;
      assert_equals(e.data, "error");
      w.close();
      test.done();
    }));
  }

  async_test(t => {
    var w = window.open();

    var img = document.createElement('img');
    img.onerror = t.step_func_done(_ => w.close());
    img.onload = t.unreached_func();
    w.document.body.appendChild(img);
    img.src = "/images/red-16x16.png";
  }, "window.open() inherits policy.");

  async_test(t => {
    var w = window.open();

    wait_for_error_from_window(w, t);

    w.document.write(`
      <img src='/images/red-16x16.png'
        onload='window.opener.postMessage("load", "*");'
        onerror='window.opener.postMessage("error", "*");'
      >
    `);
  }, "`document.write` into `window.open()` inherits policy.");

  async_test(t => {
    var b = new Blob(
      [`
        <img src='${window.origin}/images/red-16x16.png'
          onload='window.opener.postMessage("load", "*");'
          onerror='window.opener.postMessage("error", "*");'
        >
      `], {type:"text/html"});

    wait_for_error_from_window(window.open(URL.createObjectURL(b)), t);
  }, "window.open('blob:...') inherits policy.");

  // Navigation to top-level `data:` is blocked.

  async_test(t => {
    var url =
        `javascript:"<img src='${window.origin}/images/red-16x16.png'
          onload='window.opener.postMessage(\\"load\\", \\"*\\");'
          onerror='window.opener.postMessage(\\"error\\", \\"*\\");'
        >"`;

    wait_for_error_from_window(window.open(url), t);
  }, "window.open('javascript:...') inherits policy.");
</script>