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Test Info:

<style id="a">↩
:not(shadow) {↩
contain: strict;↩
}↩
.z {↩
marker-mid: url(#x);↩
display: inline-table;↩
}↩
</style>↩
<script>↩
function go() {↩
b.appendChild(c)↩
f.width↩
a.appendChild(d)↩
}↩
</script>↩
<body onload=go()>↩
<button id="b">↩
<datalist id="d">↩
<dt id="c" class="z" cite="x">↩
<base href="x"></base>↩
<image id="f">↩