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https://bugzilla.mozilla.org/show_bug.cgi?id=1448730
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<head>
  <title>Mozilla Bug 1448730</title>
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<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1448730">Mozilla Bug 1448730</a>
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<pre id="test">
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<script>
SimpleTest.waitForExplicitFinish();
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  let iframe = document.createElement("iframe");
  iframe.src = "bug1448730.html";
  iframe.style.width = "100%";
  iframe.style.height = "100%";
  document.getElementById('container').appendChild(iframe);
});
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