File: document-write.html

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<!DOCTYPE html>
<html>
  <head>
    <script src="/resources/testharness.js"></script>
    <script src="/common/get-host-info.sub.js"></script>
  </head>
  <body></body>
  <script>
    const domain_start = document.domain;
    const domain_new = domain_start.replace(/^[^.]+\./,'');

    async_test(test => {
      const iframe = document.createElement('iframe');
      iframe.src = './iframe-with-about-blank-iframe.html';
      iframe.onload = test.step_func_done(() => {
        const doc0 = frames[0].frames[0].document;
        const doc1 = frames[0].frames[1].document;

        assert_equals(doc0.domain, domain_start);
        assert_equals(doc1.domain, domain_start);

        doc0.open();
        doc1.open();
        assert_equals(doc0.domain, domain_start);
        assert_equals(doc1.domain, domain_start);

        document.domain = domain_new;
        assert_equals(doc0.domain, domain_start);
        assert_equals(doc1.domain, domain_start);

        doc0.close();
        doc1.close();
        assert_equals(doc0.domain, domain_start);
        assert_equals(doc1.domain, domain_start);
      });
      document.body.appendChild(iframe);
    }, "document.open() do not make the callee's origin to alias the caller's"
      + " one");
  </script>
</html>