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Test Info:

<!-- a -->
<style>↩
:root { contain: size }↩
</style>↩
<script>↩
function go() {↩
a.appendChild(document.head)↩
let b = d.getRootNode({composed: true})↩
b.replaceChild(c, b.childNodes[1])↩
}↩
</script>↩
<body onload=go()>↩
<svg id="c">↩
<feTile id="d" />↩
<foreignObject id="a">↩