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Test Info:
<style>
.b {
padding-block: 30%;
}
#a {
position-area: top center;
position: absolute;
}
</style>
<script>
document.addEventListener("DOMContentLoaded", () => {
a.setAttribute("requiredExtensions", "x")
})
</script>
<math display="block">
<mspace class="b"></mspace>
</math>
<svg id="a"></svg>