HTML (jquery.html)
<html>
<head>
<style>
p { margin: 8px; font-size:16px; }
.selected { color:red; }
</style>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<p>This paragraph is black and is the first paragraph.</p>
<p class="selected">This paragraph is red and is the second paragraph.</p>
<div id="result1">First paragraph has selected class: </div>
<div id="result2">Second paragraph has selected class: </div>
<div id="result3">At least one paragraph has selected class: </div>
<script>
$("div#result1").append($("p:first").hasClass("selected").toString());
$("div#result2").append($("p:last").hasClass("selected").toString());
$("div#result3").append($("p").hasClass("selected").toString());
</script>
</body>
</html>
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