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How to set all the border left properties in one declaration with JavaScript?

To set all the border left properties in a single declaration, use the borderLeft property. You can try to run the following code to learn how to set the border left properties −

Example

<!DOCTYPE html>
<html>
   <head>
      <style>
         #box {
            border: thick solid gray;
            width: 300px;
            height: 200px
         }
      </style>
   </head>
   
   <body>
      <div id = "box">Demo Text</div>
      <br>
      <br>
      
      <button type = "button" onclick = "display()">Change left border</button>
      <script>
         function display() {
            document.getElementById("box").style.borderLeft = "thick solid #000000";
         }
      </script>
      
   </body>
</html>