<style>
        div{width: 10px; height:10px; background: red; position: absolute;}
    </style>
<script>
        function getPos(ev){
            var scrollTop=document.documentElement.scrollTop||document.body.scrollTop;
            var scrollLeft=document.documentElement.scrollLeft||document.body.scrollLeft;
            return {x: ev.clientX+scrollLeft,y: ev.clientY+scrollTop};
        }
        document.onmousemove=function(ev){
            var oDiv=document.getElementsByTagName("div");
            var oEvent=ev||event;
            var pos=getPos(oEvent);
            for(var i=oDiv.length-1;i>0;i--){
                oDiv[i].style.left=oDiv[i-1].offsetLeft+"px";
                oDiv[i].style.top=oDiv[i-1].offsetTop+"px";
            }
            oDiv[0].style.left=pos.x+"px";
            oDiv[0].style.top=pos.y+"px";
        };
    </script>
<div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div></div>
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