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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 500px; height: 50px; } .test { background-color: lightblue; } .example { text-align: center; font-size: 25px; color: black; margin-bottom: 10px; } </style> </head> <body> <p>Click the button to display the class names of the div element.</p> <div id="myDIV" class="mystyle test example"> I am a DIV element with multiple classes </div> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myDIV").className; document.getElementById("demo").innerHTML = x; } </script> </body> </html>