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What is wrong with this external CSS and HTML linkage?

h1 {
    font-size: 24px;
}
<!DOCTYPE html>
<html>
<head>
    <title>Example page</title>
</head>
<body>
    <link rel="stylesheet" type="text/css" href="styles.css">
    <h1>Welcome to My Page</h1>
</body>
</html>