<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("div").prevAll("p").css("background-color","yellow");
});
</script>
</head>
<body>
<h1>What will $("div").prevAll("p") select?</h1>
<p>This is a p element</p>
<h2>This is a heading</h2>
<div style="border:1px solid black;padding:10px;">
<p>This is a p element inside a div element (will not be selected, because it does not share the same parent as the other p elements that are selected in this example).</p>
</div>
<p>This is a p element.</p>
<p>This is another p element.</p>
<div style="border:1px solid black;padding:10px;">This is a div
element (the selection of sibling elements starts from this div).</div>
<p>This is a p element (will not be selected, because it is not the previous sibling element of div. It is the <strong>next</strong> sibling element.)</p>
</body>
</html>