[zh-cn] sync translated content (#12706)

* zh-cn: sync translated content

* remove ARIA/forms

ref: mdn/content#26140

* Remove documentation for <content> element

ref: mdn/content#25352

* Remove <shadow>

ref: mdn/content#26122

---------

Co-authored-by: Allo <yin199909@aliyun.com>

files/zh-cn/_redirects.txt

@@ -1589,6 +1589,7 @@
 /zh-CN/docs/Web/API/HTMLAnchorElement/referrer	/zh-CN/docs/Web/API/HTMLAnchorElement/referrerPolicy
 /zh-CN/docs/Web/API/HTMLBaseFontElement	/zh-CN/docs/Web/CSS/CSS_Fonts
 /zh-CN/docs/Web/API/HTMLCanvasElement/捕获流	/zh-CN/docs/Web/API/HTMLCanvasElement/captureStream
+/zh-CN/docs/Web/API/HTMLContentElement	/zh-CN/docs/Web/API/HTMLSlotElement
 /zh-CN/docs/Web/API/HTMLElement.click	/zh-CN/docs/Web/API/HTMLElement/click
 /zh-CN/docs/Web/API/HTMLElement.contentEditable	/zh-CN/docs/Web/API/HTMLElement/contentEditable
 /zh-CN/docs/Web/API/HTMLElement.dir	/zh-CN/docs/Web/API/HTMLElement/dir
@@ -2008,6 +2009,7 @@
 /zh-CN/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_aria-labelledby_attribute	/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-labelledby
 /zh-CN/docs/Web/Accessibility/ARIA/ARIA_Techniques/Using_the_button_role	/zh-CN/docs/Web/Accessibility/ARIA/Roles/button_role
 /zh-CN/docs/Web/Accessibility/ARIA/ARIA_Techniques/使用aria-hidden属性	/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-hidden
+/zh-CN/docs/Web/Accessibility/ARIA/forms	/zh-CN/docs/Web/Accessibility/ARIA
 /zh-CN/docs/Web/Accessibility/ARIA/forms/alerts	/zh-CN/docs/Web/Accessibility/ARIA
 /zh-CN/docs/Web/Apps/Fundamentals/Audio_and_video_delivery	/zh-CN/docs/Web/Guide/Audio_and_video_delivery
 /zh-CN/docs/Web/Apps/Fundamentals/Audio_and_video_delivery/WebAudio_playbackRate_explained	/zh-CN/docs/Web/Guide/Audio_and_video_delivery/WebAudio_playbackRate_explained
@@ -2291,6 +2293,7 @@
 /zh-CN/docs/Web/HTML/Element/Video/ended_event	/zh-CN/docs/Web/API/HTMLMediaElement/ended_event
 /zh-CN/docs/Web/HTML/Element/Video/loadeddata_event	/zh-CN/docs/Web/API/HTMLMediaElement/loadeddata_event
 /zh-CN/docs/Web/HTML/Element/basefont	/zh-CN/docs/Web/CSS/CSS_Fonts
+/zh-CN/docs/Web/HTML/Element/content	/zh-CN/docs/Web/HTML/Element/slot
 /zh-CN/docs/Web/HTML/Element/video/play_event	/zh-CN/docs/Web/API/HTMLMediaElement/play_event
 /zh-CN/docs/Web/HTML/Element/video/timeupdate_event	/zh-CN/docs/Web/API/HTMLMediaElement/timeupdate_event
 /zh-CN/docs/Web/HTML/Element/视频	/zh-CN/docs/Web/HTML/Element/video

files/zh-cn/_wikihistory.json

@@ -10315,10 +10315,6 @@
     "modified": "2019-03-23T22:04:23.393Z",
     "contributors": ["YeeMarco"]
   },
-  "Web/API/HTMLContentElement": {
-    "modified": "2020-10-15T22:31:35.188Z",
-    "contributors": ["RainSlide", "laampui"]
-  },
   "Web/API/HTMLDataElement": {
     "modified": "2020-10-15T22:23:28.834Z"
   },
@@ -16962,10 +16958,6 @@
     "modified": "2019-03-23T22:05:01.811Z",
     "contributors": ["TiaossuP"]
   },
-  "Web/Accessibility/ARIA/forms": {
-    "modified": "2019-03-23T22:16:33.505Z",
-    "contributors": ["jack-chensonglin"]
-  },
   "Web/Accessibility/An_overview_of_accessible_web_applications_and_widgets": {
     "modified": "2019-03-23T22:13:24.205Z",
     "contributors": ["huguangju"]
@@ -22073,10 +22065,6 @@
     "modified": "2020-10-15T21:37:46.269Z",
     "contributors": ["RainSlide", "Soyaine", "PandaadnaP", "FredWe"]
   },
-  "Web/HTML/Element/content": {
-    "modified": "2019-03-23T22:10:12.369Z",
-    "contributors": ["wizardforcel"]
-  },
   "Web/HTML/Element/data": {
     "modified": "2020-10-15T21:28:38.554Z",
     "contributors": ["RainSlide", "hxl"]
@@ -22818,10 +22806,6 @@
       "ziyunfei"
     ]
   },
-  "Web/HTML/Element/shadow": {
-    "modified": "2019-03-23T22:10:02.975Z",
-    "contributors": ["wizardforcel"]
-  },
   "Web/HTML/Element/slot": {
     "modified": "2020-10-15T21:54:42.237Z",
     "contributors": ["Jennyshining", "xgqfrms", "maicss", "n313893254"]

files/zh-cn/web/accessibility/aria/index.md

@@ -63,8 +63,6 @@ function updateProgress(percentComplete) {
 
 - [Enhancing page navigation with ARIA landmarks](https://www.paciellogroup.com/blog/2013/02/using-wai-aria-landmarks-2013/)
   - : 使用 ARIA 地标改进屏幕阅读器用户的网页导航的一个很好的介绍。参考 [ARIA landmark implementation notes](https://www.paciellogroup.com/blog/2011/07/html5-accessibility-chops-aria-landmark-support/) 和真实站点上的示例（截至 2011 年 7 月更新）。
-- [Improving form accessibility](/zh-CN/docs/Web/Accessibility/ARIA/forms)
-  - : ARIA 不仅适用于动态内容！了解如何使用附加 ARIA 属性提高 HTML 表单的无障碍。
 
 ## 脚本小部件的 ARIA
 

files/zh-cn/web/html/element/input/reset/index.md

@@ -142,7 +142,6 @@ slug: Web/HTML/Element/input/reset
 
 - {{HTMLElement("input")}} 和 {{domxref("HTMLInputElement")}} 实现接口
 - [表单和按钮](/zh-CN/docs/Learn/Forms/Basic_native_form_controls#按钮)
-- [无障碍表单](/zh-CN/docs/Web/Accessibility/ARIA/forms)
 - [HTML 表单](/zh-CN/docs/Learn/Forms)
 - {{HTMLElement("button")}} 元素
 - [表单控件 CSS 兼容性列表](/zh-CN/docs/Learn/Forms/Property_compatibility_table_for_form_controls)

files/zh-cn/web/html/element/input/submit/index.md

@@ -207,7 +207,6 @@ slug: Web/HTML/Element/input/submit
 
 - {{HTMLElement("input")}} 元素和实现它的 {{domxref("HTMLInputElement")}} 接口。
 - [表单与按钮](/zh-CN/docs/Learn/Forms/Basic_native_form_controls#actual_buttons)
-- [表单无障碍](/zh-CN/docs/Web/Accessibility/ARIA/forms)
 - [HTML 表单](/zh-CN/docs/Learn/HTML/Forms)
 - {{HTMLElement("button")}} 元素
 - [CSS 属性兼容性列表](/zh-CN/docs/Learn/Forms/Property_compatibility_table_for_form_controls)

files/zh-cn/web/html/element/input/tel/index.md

@@ -501,7 +501,6 @@ input:valid + span::after {
 ## 参见
 
 - [HTML 表单指南](/zh-CN/docs/Learn/Forms)
-- [表单无障碍性](/zh-CN/docs/Web/Accessibility/ARIA/forms)
 - 相关的 {{HTMLElement("input")}} 元素
 
   - [`<input type="text">`](/zh-CN/docs/Web/HTML/Element/input/text)