<!DOCTYPE html>
<html>
<head>
<!-- Tests that `counters` works with nested counters. -->
<style>
h1, h2, h3 {
font-size: 24px;
}
</style>
</head>
<body>
<section>
<h1>1. Foo</h1>
<section>
<h2>1.1. Boo</h2>
<h2>1.2. Quux</h2>
<section>
<h3>1.2.1. Blah</h3>
</section>
</section>
<h1>1.3. Bar</h1>
<section></section>
<h2>1.1. Boo</h2>
<h2>1.2. Quux</h2>
<h1>1.3. Baz</h1>
</section>
</body>
</html>