To set the font in small capital letters, use the fontVariant property.
Example
You can try to run the following code to set the font to be displayed in small capital letters with JavaScript −
<!DOCTYPE html>
<html>
<body>
<h1>Heading 1</h1>
<p id="myID">
This is Demo Text. This is Demo Text. This is Demo Text. This is Demo Text.
This is Demo Text. This is Demo Text. This is Demo Text. This is Demo Text.
</p>
<button type="button" onclick="display()">Set Font Family and Font Variant</button>
<script>
function display() {
document.getElementById("myID").style.fontFamily = "verdana,sans-serif";
document.getElementById("myID").style.fontVariant = "small-caps";
}
</script>
</body>
</html>