To divide a div into three columns, use the columnCount property. Set the column count and divide the div.
Example
You can try to run the following code to return the numbers of columns an element is to be divided into with JavaScript −
<!DOCTYPE html>
<html>
<body>
<p>Click below to create 4 columns</p>
<button onclick="display()">Columns</button>
<div 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.
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.
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.
This is demo text. This is demo text. This is demo text. This is demo text.
</div>
<script>
function display() {
document.getElementById("myID").style.columnCount = "4";
}
</script>
</body>
</html>