To set the type of the list-item marker type, use the listStyleType property. The marker type can be square, circle, dic, etc.
Example
You can try to run the following code to set the list-item marker type with JavaScript −
<!DOCTYPE html>
<html>
<body>
<ul id="myID">
<li>One</li>
<li>Two</li>
</ul>
<button type="button" onclick="displaySquare()">Update list style type (square)</button>
<button type="button" onclick="displayDecimal()">Update list style type (decimal)</button>
<script>
function displaySquare() {
document.getElementById("myID").style.listStyleType = "square";
}
function displayDecimal() {
document.getElementById("myID").style.listStyleType = "decimal";
}
</script>
</body>
</html>