An example of the difference between display and visibility

<div style="width:100px;border:1px solid #aaa;">
<p>

</p>
</div>
<input type="button" onclick="isVisibility(('myDiv'))" value="Is visibility visible" />
<input type="button" onclick="isDisplay(('myDiv'))" value="Is it visible to display" />
<script>
function isVisibility(me){
if (=="hidden"){
="visible"; }
else{
="hidden";
}
}

function isDisplay(me){
if (=="none"){
="block"; }
else{
="none";
}
}
</script>