Use the counterIncrement property to increment counters. You can try to run the following code to increment one or more counters with JavaScript −
Example
<!DOCTYPE html>
<html>
<head>
<style>
h2 {
counter-increment: section;
}
h2:before {
content: counter(section) " Quiz ";
}
</style>
</head>
<body>
<h1>Quizzes</h1>
<p>Change the counterIncrement</p>
<h2>Ruby</h2>
<h2 id="myID">Java</h2>
<h2>PHP</h2>
<h2>Perl</h2>
<button onclick="display()">Update Counter Increment</button>
<script>
function display() {
document.getElementById("myID").style.counterIncrement = "subsection";
}
</script>
</body>
</html>