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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function () {
    $("p.intro").css("background-color", "yellow");
});
</script>
</head>
<body>

<h1>Welcome to My Homepage</h1>
<p class="intro">My name is Donald.</p>
<p>I live in Duckburg.</p>

<p class="intro">My name is Dolly.</p>
<p>I live in Duckburg.</p>

</body>
</html>