Replacing Entire Page Including Head Using Javascript

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Use document.write.

<html>
  <head>
    <script language="Javascript">
      <!--
      var newContent="<html><head><script language="Javascript">function Hi() {alert("Goodbye World");}</script></head><body onload="Hi();">New Content</body></html>";
      function ReplaceContent(NC) {
        document.open();
        document.write(NC);
        document.close();
      }
      function Hi() {
        ReplaceContent(newContent);
      }
      -->
    </script>
  </head>
  <body>
    Original Content
    <a href="https://stackoverflow.com/questions/4292603/javascript:Hi()">Replace</a>
  </body>
</html>

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