<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
sub {
vertical-align: sub;
font-size: small;
}
</style>
</head>
<body>
<h1>Example of the sub tag</h1>
<p>
Here is some text <sub>with the sub tag</sub>.
</p>
<p>
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis ...
</p>
<p>
Reference site about Lorem Ipsum,<sub> giving information on its origins</sub>, as well as a random Lipsum generator.
</p>
</body>
</html>