diff --git a/files/zh-cn/web/api/document/exitfullscreen/index.md b/files/zh-cn/web/api/document/exitfullscreen/index.md
index 715aec29309381..bc3c82a871d3dc 100644
--- a/files/zh-cn/web/api/document/exitfullscreen/index.md
+++ b/files/zh-cn/web/api/document/exitfullscreen/index.md
@@ -2,7 +2,7 @@
 title: Document：exitFullscreen() 方法
 slug: Web/API/Document/exitFullscreen
 l10n:
-  sourceCommit: 41a8b9c9832359d445d136b6d7a8a28737badc6b
+  sourceCommit: be8f7f155a48e11b30c240f8731afb1845f85378
 ---
 
 {{ApiRef("Fullscreen API")}}
diff --git a/files/zh-cn/web/api/document/fullscreen/index.md b/files/zh-cn/web/api/document/fullscreen/index.md
index 064365fe224d9b..7d6e12a6c4937c 100644
--- a/files/zh-cn/web/api/document/fullscreen/index.md
+++ b/files/zh-cn/web/api/document/fullscreen/index.md
@@ -2,7 +2,7 @@
 title: Document：fullscreen 属性
 slug: Web/API/Document/fullscreen
 l10n:
-  sourceCommit: 41a8b9c9832359d445d136b6d7a8a28737badc6b
+  sourceCommit: be8f7f155a48e11b30c240f8731afb1845f85378
 ---
 
 {{APIRef("Fullscreen API")}}{{Deprecated_Header}}
diff --git a/files/zh-cn/web/api/document/fullscreenelement/index.md b/files/zh-cn/web/api/document/fullscreenelement/index.md
index d7f0bffade6550..0d898c607e55d6 100644
--- a/files/zh-cn/web/api/document/fullscreenelement/index.md
+++ b/files/zh-cn/web/api/document/fullscreenelement/index.md
@@ -7,7 +7,7 @@ l10n:
 
 {{ApiRef("Fullscreen API")}}
 
-只读属性 **`Document.fullscreenElement`** 返回当前页面中以全屏模式呈现的 {{domxref("Element")}}，如果当前页面未使用全屏模式，则返回 `null`。
+**`Document.fullscreenElement`** 只读属性返回当前页面中以全屏模式呈现的 {{domxref("Element")}}，如果当前页面未使用全屏模式，则返回 `null`。
 
 尽管这个属性是只读的，但如果修改它，即使在严格模式下也不会抛出错误；它的 `setter` 方法是空操作将被忽略。
 
diff --git a/files/zh-cn/web/api/shadowroot/fullscreenelement/index.md b/files/zh-cn/web/api/shadowroot/fullscreenelement/index.md
new file mode 100644
index 00000000000000..d2236c6debad31
--- /dev/null
+++ b/files/zh-cn/web/api/shadowroot/fullscreenelement/index.md
@@ -0,0 +1,34 @@
+---
+title: ShadowRoot：fullscreenElement 属性
+slug: Web/API/ShadowRoot/fullscreenElement
+l10n:
+  sourceCommit: f2f9346c0c0e9f6676f2df9f1850933e274401de
+---
+
+{{APIRef("Shadow DOM")}}
+
+{{domxref("ShadowRoot")}} 接口的 **`fullscreenElement`** 只读属性返回影子树中当前全屏显示的元素。
+
+## 值
+
+当前以全屏模式显示的 {{domxref('Element')}}，若无全屏元素则为 `null`。
+
+## 示例
+
+```js
+let customElem = document.querySelector("my-shadow-dom-element");
+let shadow = customElem.shadowRoot;
+let fullscreenElem = shadow.fullscreenElement;
+```
+
+## 规范
+
+{{Specifications}}
+
+## 浏览器兼容性
+
+{{Compat}}
+
+## 参见
+
+- {{domxref("Document.fullscreenElement")}}