To set the space between cells in a table with JavaScript, use the borderSpacing property. Set the spacing using this property.
Example
You can try to run the following code to learn how to set the space between table cells −
<!DOCTYPE html>
<html>
<body>
<table id="newTable" border="2">
<tr>
<th>EmpID</th>
<th>EmpName</th>
<th>EmpDept</th>
</tr>
<tr>
<td>001</td>
<td>Amit</td>
<td>IT</td>
</tr>
<tr>
<td>002</td>
<td>John</td>
<td>Finance</td>
</tr>
<tr>
<td>003</td>
<td>David</td>
<td>Marketing</td>
</tr>
</table>
<br>
<button onclick="display()">Click to set space between cells</button>
<script>
function display() {
document.getElementById("newTable").style.borderSpacing = "15px";
}
</script>
</body>
</html>