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diff --git a/files/zh-cn/orphaned/web/api/parentnode/firstelementchild/index.html b/files/zh-cn/orphaned/web/api/parentnode/firstelementchild/index.html
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+---
+title: Element.firstElementChild
+slug: orphaned/Web/API/ParentNode/firstElementChild
+translation_of: Web/API/ParentNode/firstElementChild
+original_slug: Web/API/ParentNode/firstElementChild
+---
+<p>{{ APIRef("DOM") }}</p>
+
+<p><strong><code>ParentNode.firstElementChild</code></strong> 只读属性，返回对象的第一个子 {{domxref("元素")}}, 如果没有子元素，则为null。</p>
+
+<div class="note">
+<p><span>他的属性最初是在{{domxref("element遍历")}}纯接口中定义的。由于这个接口包含两组不同的属性，一个针对具有子元素的{{domxref("Node")}}，一个针对子元素的属性，因此它们被移动到两个单独的纯接口中，{{domxref("ParentNode")}}和{{domxref("ChildNode")}}。在本例中，firstElementChild移动到{{domxref("ParentNode")}}。这是一个相当技术性的更改，不应该影响兼容性。</span></p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>element</em> = node.firstElementChild;
+</pre>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: html">&lt;ul id="foo"&gt;
+  &lt;li&gt;First  (1)&lt;/li&gt;
+  &lt;li&gt;Second (2)&lt;/li&gt;
+  &lt;li&gt;Third  (3)&lt;/li&gt;
+&lt;/ul&gt;
+
+&lt;script&gt;
+var foo = document.getElementById('foo');
+// yields: First  (1)
+console.log(foo.firstElementChild.textContent);
+&lt;/script&gt;
+</pre>
+
+<h2 id="适用于_IE8、IE9_和_Safari_的_Polyfill">适用于 IE8、IE9 和 Safari 的 Polyfill</h2>
+
+<pre><code>// Overwrites native 'firstElementChild' prototype.
+// Adds Document &amp; DocumentFragment support for IE9 &amp; Safari.
+// Returns array instead of HTMLCollection.
+;(function(constructor) {
+    if (constructor &amp;&amp;
+        constructor.prototype &amp;&amp;
+        constructor.prototype.firstElementChild == null) {
+        Object.defineProperty(constructor.prototype, 'firstElementChild', {
+            get: function() {
+                var node, nodes = this.childNodes, i = 0;
+                while (node = nodes[i++]) {
+                    if (node.nodeType === 1) {
+                        return node;
+                    }
+                }
+                return null;
+            }
+        });
+    }
+})(window.Node || window.Element);</code></pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM WHATWG', '#dom-parentnode-firstelementchild', 'ParentNode.firstElementChild')}}</td>
+   <td>{{Spec2('DOM WHATWG')}}</td>
+   <td>Splitted the <code>ElementTraversal</code>interface in {{domxref("ChildNode")}} and <code>ParentNode</code>. This method is now defined on the latter.<br>
+    The {{domxref("Document")}} and {{domxref("DocumentFragment")}} implemented the new interfaces.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('Element Traversal', '#attribute-firstElementChild', 'ElementTraversal.firstElementChild')}}</td>
+   <td>{{Spec2('Element Traversal')}}</td>
+   <td>Added its initial definition to the<code>ElementTraversal</code> pure interface and use it on {{domxref("Element")}}.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.ParentNode.firstElementChild")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<h2 id="Ed"><a class="button section-edit only-icon" href="https://developer.mozilla.org/zh-CN/docs/Web/API/ParentNode/lastElementChild$edit#参见" rel="nofollow, noindex"><span>Ed</span></a></h2>
+
+<ul>
+ <li>纯接口 {{domxref("ParentNode")}} 和 {{domxref("ChildNode")}}。</li>
+ <li>
+  <div class="syntaxbox">实现了此纯接口的对象类型：{{domxref("Document")}}、{{domxref("Element")}}，和 {{domxref("DocumentFragment")}}。</div>
+ </li>
+</ul>
diff --git a/files/zh-cn/orphaned/web/api/parentnode/lastelementchild/index.html b/files/zh-cn/orphaned/web/api/parentnode/lastelementchild/index.html
new file mode 100644
index 0000000000..566d3a1976
--- /dev/null
+++ b/files/zh-cn/orphaned/web/api/parentnode/lastelementchild/index.html
@@ -0,0 +1,94 @@
+---
+title: Element.lastElementChild
+slug: orphaned/Web/API/ParentNode/lastElementChild
+translation_of: Web/API/ParentNode/lastElementChild
+original_slug: Web/API/ParentNode/lastElementChild
+---
+<p>{{ APIRef("DOM") }}</p>
+
+<p>只读属性 <code><strong>ParentNode.lastElementChild</strong></code> 返回对象的最后一个子{{domxref("Element", "元素")}}，如果没有子元素，则返回 <code>null</code>。</p>
+
+<div class="note">
+<p>This property was initially defined in the {{domxref("ElementTraversal")}} pure interface. As this interface contained two distinct set of properties, one aimed at {{domxref("Node")}} that have children, one at those that are children, they have been moved into two separate pure interfaces, {{domxref("ParentNode")}} and {{domxref("ChildNode")}}. In this case, <code>lastElementChild</code> moved to {{domxref("ParentNode")}}. This is a fairly technical change that shouldn't affect compatibility.</p>
+</div>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>element</em> = node.lastElementChild; </pre>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: html">&lt;ul id="foo"&gt;
+  &lt;li&gt;First  (1)&lt;/li&gt;
+  &lt;li&gt;Second (2)&lt;/li&gt;
+  &lt;li&gt;Third  (3)&lt;/li&gt;
+&lt;/ul&gt;
+
+&lt;script&gt;
+var foo = document.getElementById('foo');
+// yields: Third  (3)
+console.log(foo.lastElementChild.textContent);
+&lt;/script&gt;
+</pre>
+
+<h2 id="适用于_IE8、IE9_和_Safari_的_Polyfill">适用于 IE8、IE9 和 Safari 的 Polyfill</h2>
+
+<pre class="brush: js">// Overwrites native 'lastElementChild' prototype.
+// Adds Document &amp; DocumentFragment support for IE9 &amp; Safari.
+// Returns array instead of HTMLCollection.
+;(function(constructor) {
+    if (constructor &amp;&amp;
+        constructor.prototype &amp;&amp;
+        constructor.prototype.lastElementChild == null) {
+        Object.defineProperty(constructor.prototype, 'lastElementChild', {
+            get: function() {
+                var node, nodes = this.childNodes, i = nodes.length - 1;
+                while (node = nodes[i--]) {
+                    if (node.nodeType === 1) {
+                        return node;
+                    }
+                }
+                return null;
+            }
+        });
+    }
+})(window.Node || window.Element);
+</pre>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM WHATWG', '#dom-parentnode-lastelementchild', 'ParentNode.lastElementChild')}}</td>
+   <td>{{Spec2('DOM WHATWG')}}</td>
+   <td>Splitted the <code>ElementTraversal</code> interface in {{domxref("ChildNode")}} and <code>ParentNode</code>. This method is now defined on the latter.<br>
+    The {{domxref("Document")}} and {{domxref("DocumentFragment")}} implemented the new interfaces.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('Element Traversal', '#attribute-lastElementChild', 'ElementTraversal.lastElementChild')}}</td>
+   <td>{{Spec2('Element Traversal')}}</td>
+   <td>Added its initial definition to the <code>ElementTraversal</code> pure interface and use it on {{domxref("Element")}}.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.ParentNode.lastElementChild")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>纯接口 {{domxref("ParentNode")}} 和 {{domxref("ChildNode")}}。</li>
+ <li>
+  <div class="syntaxbox">实现了此纯接口的对象类型：{{domxref("Document")}}、{{domxref("Element")}}，和 {{domxref("DocumentFragment")}}。</div>
+ </li>
+</ul>