CSS - style type - letter spacing

<style type="text/css">
h1 {
    letter-spacing: 10px;
}

h2 {
    letter-spacing: 2px;
}

h3 {
    letter-spacing: -1px;
}
</style>
<h1>This is heading 1</h1>
<h2>This is heading 2</h2>
<h3>This is heading 3</h3>

This is heading 1

This is heading 2

This is heading 3