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<script>
function go() {
a.attachShadow({ mode: "open" });
a.appendChild(b);
}
</script>
<body onload=go()>
<div id="b"></div>
<div id="a"></div>
<script>
function go() {
a.attachShadow({ mode: "open" });
a.appendChild(b);
}
</script>
<body onload=go()>
<div id="b"></div>
<div id="a"></div>