jQuery animate()
border Top Width
<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"> </script>// w w w .j a va2s . co m <script> $(document).ready(function(){ $(".btn1").click(function(){ $("p").animate({borderTopWidth: "10px"}); }); $(".btn2").click(function(){ $("p").animate({borderTopWidth: "1px"}); }); }); </script> </head> <body> <button class="btn1">Animate</button> <button class="btn2">Reset</button> <p style="border:1px solid black">This is a paragraph.</p> </body> </html>