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Preview of https://hg.mozilla.org/mozilla-central/raw-file/tip/testing/web-platform/tests/svg/types/scripted/SVGElement.className-01.svg
<title>SVGElement.prototype.className: Reflects to .classList</title>
<h:script src="/resources/testharness.js"/>
<h:script src="/resources/testharnessreport.js"/>
<script>
test(() => {
const element = document.createElementNS('http://www.w3.org/2000/svg', 'g');
assert_false(element.classList.contains('one'), "classList is initially empty");
element.className.baseVal = 'one';
assert_true(element.classList.contains('one'), "className should reflect to classList");
});
</script>
</svg>