[javascript] HTML tag inside JavaScript

<div id="demo"></div>

<input type="submit" name="submit" id="submit" value="Submit" onClick="return empty()">


<script type="text/javascript">
        function empty()
        {
          var x;
          x = document.getElementById("feedbackpost").value;
          if (x == "")
           {
             var demo = document.getElementById("demo");
             demo.innerHTML =document.write='<h1>Hello member</h1>';
              return false;
           };
        }
    </script>

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