gecko-dev/layout/style/crashtests/1439793.html

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<script>
o1 = document.createElementNS("http://www.w3.org/1998/Math/MathML", "mfenced")
document.documentElement.appendChild(o1);
o3 = document.createElementNS("http://www.w3.org/1999/xhtml", "style");
o3.appendChild(document.createTextNode("[s=\"\"]{"));
(document.head || document.children[0]).appendChild(o3);
o4 = o3.sheet;
window.scrollBy(0.41979783887602806, 16);
o4.insertRule("::-moz-math-anonymous,g{scroll-behavior:smooth", 1);
</script>