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                <ui id="parent">
  <li id="child1">child1</li>
  <li id="child2">child2</li>
  <li id="child3">child3</li>





                // コピーするHTML要素を取得
var parent = document.getElementById("parent");

// 要素のコピー
var clone_element = parent.cloneNode(true);

// コピーした要素のidを編集 = "parent2";

// コピーした要素の子要素を編集
var li_element = clone_element.querySelectorAll("li");
for (var i = 0; i < li_element.length; i++) {
    // 要素のテキストコンテンツを設定
    li_element[i].textContent = 'copied child' + (i+1);

// コピーしたHTML要素をページに挿入