<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
#point:after{
content:"\02083";
}
</style>
</head>
<body>
<p>3 subscript using Hexa Decimal: ₃</p>
<p>3 subscript using HTML Code: ₃</p>
<p id="point">3 subscript using CSS Entity: </p>
</body>
</html>