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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> </head> <body> <h2>Change Right Border of Div in JavaScript</h2> <div id="myDiv" style="width:150px"> <p>This is a paragraph in Div.</p> <span>This is a span in Div.</span> </div> <br> <button type="button" onclick="changeStyle()">Click Me</button> <script> function changeStyle(){ var element = document.getElementById("myDiv"); element.style.borderRight = "2px solid red"; } </script> </body> </html>