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<!DOCTYPE html> <html> <head> <style> .example { color: red; padding: 5px; width: 150px; font-size: 15px; } .newClass { color: blue; padding: 15px; width: 250px; font-size: 18px; background-color: white; } </style> </head> <body> <p>Click the button to change the value of the button element's second attribute.</p> <button onclick="myFunction()" class="example">Try it</button> <script> function myFunction() { var a = document.getElementsByTagName("BUTTON")[0]; a.attributes[1].value = "newClass"; } </script> </body> </html>