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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>
document.addEventListener("DOMContentLoaded", () =>
SpecialPowers.pushPrefEnv({"set": [["dom.mutation_events.enabled", true]]}, () => {
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
const set = document.createElementNS("http://www.w3.org/2000/svg", "set");
svg.appendChild(set);
document.documentElement.appendChild(svg);
const animation = new Animation();
animation.addEventListener("finish", () =>
svg.setAttribute("pointer-events", "visible")
);
animation.startTime = 2713;
document.addEventListener("DOMAttrModified", e => {
e.originalTarget.setCurrentTime(1.050520798894502e38);
document.documentElement.removeAttribute("class");
});
})
);
</script>
</head>
</html>