<!DOCTYPE html>
<html>
<title>Sort a HTML List Alphabetically</title>
<body>
<p>Click the button to sort the list alphabetically:</p>
<button onclick="sortList()">Sort</button>
<ul id="id01">
<li>Oslo</li>
<li>Stockholm</li>
<li>Helsinki</li>
<li>Berlin</li>
<li>Rome</li>
<li>Madrid</li>
</ul>
<script>
function sortList() {
var list, i, switching, b, shouldSwitch;
list = document.getElementById("id01");
switching = true;
while (switching) {
switching = false;
b = list.getElementsByTagName("LI");
for (i = 0; i < (b.length - 1); i++) {
shouldSwitch = false;
if (b[i].innerHTML.toLowerCase() > b[i + 1].innerHTML.toLowerCase()) {
shouldSwitch = true;
break;
}
}
if (shouldSwitch) {
b[i].parentNode.insertBefore(b[i + 1], b[i]);