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<html>
  <head>
    <title>Access to sandbox iframe</title>
    <link rel="author" title="Kinuko Yasuda" href="mailto:kinuko@chromium.org">
    <link rel="help" href="https://html.spec.whatwg.org/multipage/#sandboxed-origin-browsing-context-flag">
    <link rel="help" href="https://html.spec.whatwg.org/multipage/#integration-with-idl">
    <script src="../../../resources/testharness.js"></script>
    <script src="../../../resources/testharnessreport.js"></script>
  </head>

  <body>
    <h1>