Edit in JSFiddle

<body>
<div id="legend">
</div>
<input type="button" id="b1" value="Press" onclick="legend()"/>
</body>
function legend()
{
var elementFieldset=document.createElement("fieldset");
var elementLegend=document.createElement("legend");
var textLegend=document.createTextNode("Employee Information");
elementLegend.appendChild(textLegend);
elementFieldset.appendChild(elementLegend);
var elementLabel=document.createElement("Label");
var textLabel=document.createTextNode("Name:");
elementLabel.appendChild(textLabel);
var elementTextbox=document.createElement("input");
elementTextbox.setAttribute("type","text");
elementFieldset.appendChild(elementLabel);
elementFieldset.appendChild(elementTextbox);
document.getElementById("legend").appendChild(elementFieldset);
}
legend
{
background-color:lightblue;
color:blue;
font-size:30px;
font-family:comic sans ms;
border:2px dotted black;
}