File: srcdoc-child-frame.html

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<head>
  <meta http-equiv="Content-Security-Policy" content="img-src 'none'">
</head>
<body>
  <script>
    var i = document.createElement('iframe');
    i.srcdoc=`<script>
                window.addEventListener('securitypolicyviolation', function(e) {
                  if (e.violatedDirective == 'img-src') {
                    top.postMessage('img blocked', '*');
                  }
                })
              </scr` + `ipt>
              <img src='/content-security-policy/support/fail.png'
                onload='top.postMessage("img loaded", "*")'/>`;
    i.id = "srcdoc-frame";
    document.body.appendChild(i);
  </script>
</body>