| у меня все работает: 
 
<!doctype hrml>
<html>
<head>
<style type="text/css">
.animate_for_old_postion{
    width: 100px;
    height: 100px;
    border: 1px solid #000;
    position: fixed;
    -webkit-transition-property:left,top;
    -webkit-transition-duration:1s;
    -webkit-transition-timing-function:ease;
     
    -moz-transition-property:left,top;
    -moz-transition-duration:1s;
    -moz-transition-timing-function:ease;
    -o-transition-property: left,top;
    -o-transition-duration: 1s;
    -o-transition-timing-function: ease;
    transition-property:left,top;
    transition-duration:1s;
    transition-timing-function:ease;
}
.animate_for_old_postion:hover {
    left: 100px;
    top: 100px;
}
</style>
</head>
<body>
<div class="animate_for_old_postion"></div>
</body>
</html>
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