Live Demo: Selecting All Following Siblings between Two Elements in jQuery

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Selecting All Following Siblings between Two Elements in jQuery</title>
<style>
    .highlight{
        background: yellow;
    }        
</style>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script>
$(document).ready(function(){
    $("h1").nextUntil("ul").addClass("highlight");
});
</script>
</head>
<body>
    <div class="container">
        <h1>Hello World</h1>
        <p>This is a <em>simple paragraph</em>.</p>
        <p>This is another paragraph.</p>
        <ul>
            <li>Item One</li>
            <li>Item Two</li>
        </ul>
    </div>
</body>
</html>