<!DOCTYPE html>
<html>
<head>
<style>
ol {
counter-reset: section;
list-style-type: none;
}
li::before {
counter-increment: section;
content: counters(section,".") " ";
}
</style>
</head>
<body>
<h1>The counters() Function</h1>
<p>Here we use the counters() function to insert a string between different levels of nested counters:</p>
<ol>
<li>item</li>
<li>item
<ol>
<li>item</li>
<li>item</li>
<li>item
<ol>
<li>item</li>
<li>item</li>
<li>item</li>
</ol>
</li>
<li>item</li>
</ol>
</li>
<li>item</li>
<li>item</li>
</ol>
</body>
</html>