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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 500px; height: 50px; padding: 15px; border: 1px solid black; } .anotherClass { background-color: coral; color: white; } .thirdClass { text-transform: uppercase; text-align: center; font-size: 25px; } </style> </head> <body> <p>Click the button to add multiple classes to DIV.</p> <button onclick="myFunction()">Try it</button> <p><strong>Note:</strong> The classList property is not supported in Internet Explorer 9 and earlier versions.</p> <div id="myDIV"> I am a DIV element </div> <script> function myFunction() { document.getElementById("myDIV").classList.add("mystyle", "anotherClass", "thirdClass"); } </script> </body> </html>