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<html><title>W3.JS</title><link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"><script src="https://www.w3schools.com/lib/w3.js"></script><body class="w3-container"><h2>Testing W3.JS with CSS</h2><h2>Sort List</h2><p>Click the button to sort the list.</p><p><button onclick="w3.sortHTML('#id01', 'li')" class="w3-button w3-black">Sort</button></p><ul id="id01" class="w3-ul w3-black"> <li>Oslo</li> <li>Stockholm</li> <li>Helsinki</li> <li>Berlin</li> <li>Rome</li> <li>Madrid</li></ul></body></html>