<!DOCTYPE html>

<html>
<head>
    <style>
        .box {
            height: 100px;
            width: 100px;
            margin: 10px 0;
            background-color: blue;
            -webkit-transform: translateZ(0);
        }
        
        .leaf {
            background-color: green;
        }
    </style>
    <script type="text/javascript" charset="utf-8">
        
        function makeDeepTree(depth, host)
        {
            var parent = host;
            var innerElement;
            for (var i = 0; i < depth; i++) {
                var currElement = document.createElement("div");
                currElement.className = 'box';
                parent.appendChild(currElement);
                parent = currElement;
                innerElement = currElement;
            }
            innerElement.classList.add('leaf');
        }
        
        function doTest()
        {
            makeDeepTree(129, document.getElementById('deep'));
        }
        
        window.addEventListener('load', doTest, false);
    </script>
</head>
<body>
    <div id="before" class="leaf box"></div>
    <div id="deep" class="box"></div>
    <div id="after" class="leaf box"></div>
</body>
</html>