Example:
<!DOCTYPE html>
<html>
<head>
<style>
h1 {
text-decoration: overline;
}
h2 {
text-decoration: line-through;
}
h3 {
text-decoration: underline;
}
h4 {
text-decoration: underline overline;
}
h5 {
text-decoration: none;
}
</style>
</head>
<body>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>
<h4>This is heading 4</h4>
<h5>This is heading 4</h5>
<p>This is heading 4</p>
</body>
</html>