вот накидал небольшой пример
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<link rel="stylesheet" href="css.css">
	<script src="jsTest.js"></script>
</head>
<body>
	<div id="testDIV">
		<span>SPAN 1</span>
		<span>SPAN 2</span>
	</div>
	
</body>
</html>
	
	| Код: | 
	| #testDIV{
	position: relative;
} | 
	
window.onload = function(){
	var obj = {};
	var testDiv = document.querySelector('#testDIV');
	var childTestDiv = testDiv.children;
	for(var i = 0; i < childTestDiv.length; i++){
		var leftPos = childTestDiv[i].offsetLeft;
		childTestDiv[i].style.position = 'absolute';
		childTestDiv[i].style.left = leftPos + 'px';
	}
}