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Test Info:

<style>
.c {
box-decoration-break: clone;
padding-bottom: 41vmax;
}
</style>
<script>
go = () => {
try { b.appendChild(a) } catch(e) { }
}
</script>
<body onload=go()>
<button style="columns: 72 0px">
<dl style="columns: 1">
<dd>-</dd>
<dt id="b" style="float: left" class="c">x</dt>
</dl>
<dl>
<map id="a">
<canvas></canvas>
<details open="">x</details>