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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("p[class!='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>My best friend is Mickey.</p>
Who is your favourite:
<ul id="choose">
  <li>Goofy</li>
  <li>Mickey</li>
  <li>Pluto</li>
</ul>
</body>
</html>