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<script>↩↩function init() { ↩
document.getElementById("three").appendChild(document.getElementById("two"))
setTimeout(function(){
document.getElementById("two").appendChild(document.getElementById("one"))
}, 200);
}↩↩window.addEventListener("load", init, 0);↩↩</script>
<table style="border-collapse: collapse;" border="1"><tr><td id="one">1</td><td id="two">2</td></tr><tr><td id="three">3</td><td>4</td></tr></table>