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<!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>
</body>
</html>