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<!DOCTYPE html> <html> <head> <style> .mystyle { width: 300px; height: 50px; background-color: coral; color: white; font-size: 25px; } </style> </head> <body> <h2>Cross-browser solution for classList.add()</h2> <p>The classList property is not supported in Internet Explorer 9 and earlier.</p> <p>In this example, we check if the browser supports the classList.add() method. If not, use the className property instead to achieve the same result (for IE9 and earlier).</p> <p>Click the button to add the class "mystyle" to the DIV element.</p> <button onclick="myFunction()">Try it</button> <div id="myDIV"> I am a DIV element </div> <p id="demo"></p> <script> function myFunction() { var x = document.getElementById("myDIV"); if (x.classList) { x.classList.add("mystyle"); } else { x.className = "mystyle"; } } </script> </body> </html>