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Test Info:

<!DOCTYPE html>
<html>
<body>
<math class="hidden">
<mi>x</mi>
<mo>=</mo>
</math>
<script>
window.onload = function() {
let s = document.createElement("style");
s.textContent = `
body {
line-height: 1.42857143;
}
.hidden {
display: none;
}
`;
document.body.appendChild(s);
};
</script>
</body>
</html>