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How to set the width of the left border with JavaScript?

To set the width of the left border in JavaScript, use the borderLeftWidth property. Set the width under this property that you want for the border. You can try to run the following code to learn how to set the width of the left border −

Example

<!DOCTYPE html>
<html>
   <head>
      <style>
         #box {
            border: thick solid gray;
            width: 300px;
            height: 300px;
         }
      </style>
   </head>
   
   <body>
      <div id = "box">Demo Text</div>
      <br>
      <br>
      <button type = "button" onclick = "display()">Change left border width</button>
      
      <script>
         function display() {
            document.getElementById("box").style.borderLeftWidth = "10px";
         }
      </script>
      
   </body>
</html>