<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$(".intro, .demo, .end").css("background-color", "yellow");
});
</script>
</head>
<body>
<h1>Welcome to My Homepage</h1>
<p class="intro">This paragraph has class "intro".</p>
<p>This is a paragraph.</p>
<p class="demo">This paragraph has class "demo".</p>
<p>This is another paragraph.</p>
<p class="end">This paragraph has class "end".</p>
</body>
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</html>