HTML (jquery.html)
<html>
<head>
<style>
div { width:70px; height:70px; background:#abc;
border:2px solid black; margin:10px; float:left; }
div.before { border-color: red; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<script>$("div:last").prevAll().addClass("before");</script>
</body>
</html>
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