<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
p {
letter-spacing: normal;
}
.spacing {
letter-spacing: 4px;
}
.spacing-negative {
letter-spacing: -4px;
}
</style>
</head>
<body>
<h2>Letter-spacing property example</h2>
<p>This is a paragraph.</p>
<p class="spacing">This is a paragraph.</p>
<p class="spacing-negative">This is a paragraph.</p>
</body>
</html>