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Test Info:

<style>↩
#a {↩
grid-auto-rows: min-content;↩
display: grid;↩
}↩
:not(html) {↩
margin-bottom: -1vmin;↩
column-width: 0;↩
}↩
</style>↩
<script>↩
function go() {↩
a.appendChild(b);↩
document.documentElement.style.display = "none"
document.documentElement.getBoundingClientRect()↩
document.documentElement.style.display = ""
}↩
</script>↩
<a id="a">A</a>↩
<ul>↩
<li>↩
<audio onloadstart="go()" src="">↩
<keygen id="b">↩