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Test Info:
<!DOCTYPE html>
<html class="reftest-wait">
<body>
<script>
addEventListener("DOMContentLoaded", function() {
let a = document.createElement("th");
document.documentElement.appendChild(a);
a.animate([{"mask": "repeat-y "}], 484);
document.documentElement.classList.remove("reftest-wait");
});
</script>
</body>
</html>