Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
body {
    counter-reset: section;
}

h2::before {
    counter-increment: section;
    content: "Section " counter(section) ": ";
}
</style>
</head>
<body>

<h1>Using CSS Counters:</h1>
<h2>HTML Tutorial</h2>
<h2>CSS Tutorial</h2>
<h2>JavaScript Tutorial</h2>

<p><b>Note:</b> IE8 supports these properties only if a !DOCTYPE is specified.</p>

</body>
</html>