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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, name, arr;
  x = document.getElementById("myDIV");
  if (x.classList) { 
    x.classList.add("mystyle");
  } else {
    name = "mystyle";
    arr = x.className.split(" ");
    if (arr.indexOf(name) == -1) {
      x.className += " " + name;
    }
  }
}
</script>
​
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