HTML - Caracteres especiales en HTML

<p id="p2">&lt;ms&gt;</p>

<button onclick="copiarAlPortapapeles('p2')">&lt;MS&gt; </button>

<script>

function copiarAlPortapapeles(id_elemento) {

  var aux = document.createElement("input");

  aux.setAttribute("value", document.getElementById(id_elemento).innerHTML);

  document.body.appendChild(aux);

  aux.select();

  document.execCommand("copy");

  document.body.removeChild(aux);

  document.getElementById("Mainifr").focus();

}

</script>

aux.setAttribute(

    "value",

    document.getElementById(id_elemento).innerHTML.replace( /&lt;/g, "<" )

        .replace( />/g, ">" )

        .replace( /"/g, "\"" )

);