We would like to know how to insert to DOM using insertBefore() in body tag.
<!DOCTYPE html>
<html>
<body>bla bla
<script type='text/javascript'>
<!--from w ww . j av a 2s .c om-->
var p = document.createElement("p");
p.innerHTML = "test1";
document.body.insertBefore(p, document.body.firstChild);
</script>
</body>
</html>
The code above is rendered as follows: