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Implementation of classList attribute (DOMTokenList interface). Depends on Array Generics.

var element = document.documentElement;

// add class
element.classList.add("root");

// remove class
element.classList.remove("root");

// toggle class
element.classList.toggle("root");

// test class
element.classList.contains("root");

Just include into your document:

<script src="path_to/array.generics.min.js"></script>
<script src="path_to/element.classlist.min.js"></script>

• Browsers that natively supports classList does not pass all tests (at least at the moment).
• This shim does not work in Internet Explorer versions less than 8.