gecko-dev/layout/reftests/mathml/shadow-dom-1.html

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<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Test for bug 1066554 - Shadow DOM loads MathML stylesheets as needed</title>
<body>
<div id="x"></div>
<script>
function insertShadowMathML() {
var x = document.getElementById("x");
if (x.createShadowRoot) {
x.createShadowRoot();
x.shadowRoot.innerHTML =
'<math><msup><mi>X</mi><mi>X</mi></msup></math>';
}
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", insertShadowMathML);
</script>
</body>
</html>