To set the space between characters, use the JavaScript letterSpacing property.
Example
You can try to run the following code to set the space between characters in a text with JavaScript −
<!DOCTYPE html>
<html>
<body>
<h1>Heading 1</h1>
<p id="myID">This is Demo Text.</p>
<button type="button" onclick="display()">Set Space between characters</button>
<script>
function display() {
document.getElementById("myID").style.letterSpacing = "7px";
}
</script>
</body>
</html>