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How to set all the four border radius properties at once with JavaScript?

To set all the border-radius properties in JavaScript, use the borderRadius property. Set the border-radius properties at once using this.

Example

You can try to run the following code to learn how to set all the four border-radius properties −

<!DOCTYPE html>
<html>
   <head>
      <style>
         #box {
            border: thick solid gray;
            width: 200px;
            height: 200px
         }
      </style>
   </head>
   <body>
      <div id="box">Demo Text</div>
      <br><br>
      <button type="button" onclick="display()">Add border radius</button>
      <script>
         function display() {
            document.getElementById("box").style.borderRadius = "20px";
         }
      </script>
   </body>
</html>