<!DOCTYPE html>
<html>
<body style="font-family: Ahem; -webkit-font-smoothing: none;">
<style>
div.table { display: table; }
div.cell { display: table-cell; width: 50px; height: 50px; background-color: blue; }
div.row { display: table-row; }
div.test { background-color: green; width: 50px; height: 50px; }
</style>
<div class="table" id="table-1">
<div class="row" id="row-1">
<div class="cell"></div>
</div>
<div class="row" id="row-2">
<div class="cell"></div>
</div>
</div>
<script>
function createDiv()
{
var divElement = document.createElement("div");
divElement.setAttribute("class", "test");
return divElement;
}
function insertDiv(tableID, beforeID)
{
var table = document.getElementById(tableID);
var before = document.getElementById(beforeID);
table.insertBefore(createDiv(), before);
}
document.body.offsetTop;
insertDiv("table-1", "row-2");
</script>
</body>
</html>