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Test Info:

<!DOCTYPE html>
<style>
.c1 {
column-span: all;
border-bottom-style: groove;
float: left;
border-width: 0em 0em 9em 1em;
box-decoration-break: clone;
height: 21vmin;
}
.c2 {
height: 74vmin;
}
:not(param) {
column-width: 1px;
}
</style>
<script>
function go() {
a.lastElementChild.appendChild(b)
window.requestIdleCallback(window.close)
}
function fuzz() {
var x = document.createElementNS("", "f")
x.prepend("1")
b.insertAdjacentHTML("afterEnd", x.outerHTML)
}
</script>
<body onload=go()>
<aside id="a">
<data id="b" class="c1">U-.9zA</shadow>
</aside>
<details ontoggle="fuzz()" open="" class="c2">