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<script>
function fzfn(e){
let nc=window.frames[0].document.body.childElementCount;
let o=window.frames[0].document.body.childNodes[1%nc];
document.getElementById('b').appendChild(o.parentNode.removeChild(o));
}
window.onload=function(){
document.body.onerror=fzfn;
document.getElementById('c').addEventListener('DOMNodeRemoved', fzfn, true);
document.getElementById('c').attributes[0].name=='id';
window.frames[0].document.body.appendChild(document.getElementById('c'));
document.getElementById('a').innerHTML=document.createElement('multicol').outerHTML;
}
</script>
<iframe></iframe>
<script id='a'></script>
<script id='b'></script>
<script id='c'></script>