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Test Info:

<style>
#a {
display: flex;
flex-flow: column-reverse;
}
:not(wbr) {
column-width: 1px;
}
</style>
<script>
window.onload = () => {
a.insertBefore(b, a.childNodes[0])
document.documentElement.style.display = "none"
document.documentElement.getBoundingClientRect()
document.documentElement.style.display = ""
}
</script>
<label id="a">x</label>
<details id="b">