Use the marginLeft property in JavaScript, to set the left margin. You can try to run the following code to set the left margin of an element with JavaScript −
Example
<!DOCTYPE html> <html> <body> <button type="button" onclick="display()">Add left margin</button> <p id="myID">This is demo text.</p> <script> function display() { document.getElementById("myID").style.marginLeft = "80px"; } </script> </body> </html>