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Test Info:

<!doctype html>
<style>
* {
transition: font-size-adjust 4s linear allow-discrete;
}
:empty {
font-size-adjust: 0;
}
#container {
container-type: inline-size;
}
</style>
<body>
<math>
<semantics id="container"><mo></mo></semantics>
</math>
</body>