O código a seguir imprime

Isto deve imprimir (b) Isso deve imprimir (/ b)Isto deve imprimir

<script>
function produceMessage(){
    var msg= '<b>This should print</b>';
    return msg;
}

</script>

<span id="mySpan"></span>

<script>

    document.body.appendChild(document.createTextNode(produceMessage()));
    document.write(produceMessage());
    document.getElementById('mySpan').innerHTML=produceMessage();
</script>