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chromium/third_party/blink/web_tests/fast/dom/Element/class-list.html 

<!DOCTYPE html>
<script src="../../../resources/js-test.js"></script>
<script>
description('Tests that classList works on non HTMLElements');

var htmlElement = document.createElement('div');
htmlElement.setAttribute('class', 'foo');
shouldBeTrue('htmlElement.classList instanceof DOMTokenList');

var svgElement = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
svgElement.setAttribute('class', 'foo');
shouldBeTrue('svgElement.classList instanceof DOMTokenList');


var xmlElement = document.createElementNS('http://www.example.com', 'xml');
xmlElement.setAttribute('class', 'foo');
shouldBeTrue('xmlElement.classList instanceof DOMTokenList');

</script>