Tryit Editor v2.9

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>
p {
    counter-increment: myIndex;
}

p:before {
    content:counter(myIndex);
}
</style>
</head>
<body>

<p>First make a variable (myIndex) and make it increase every time a p element occurs.</p>
<p>Then insert the counter in front of all p elements</p>
<p><b>Note:</b> For the counter property to work in IE8, a DOCTYPE must be declared.</p>

</body>
</html>