<!DOCTYPE html>
<html lang="en">
<head>
<style type="text/css">
body {
counter-reset: section;
}
h1 {
counter-reset: category;
}
h1:before {
counter-increment: section;
content: "Section " counter(section) ". ";
}
h2:before {
counter-increment: category;
content: counter(section) "." counter(category) " ";
}
</style>
</head>
<body>
<h1>Tutorials</h1>
<h2>HTML Tutorial</h2>
<h2>CSS Tutorial</h2>
<h1>References</h1>
<h2>HTML Tags</h2>
<h2>CSS Properties</h2>
<p>
<strong>Note:</strong> Internet Explorer 7 and earlier versions don't
support the
<code>counter-increment</code>
property. IE8 supports this property only if a
<code><!DOCTYPE></code>
is specified.
</p>
</body>
</html>
【header】
