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class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#描述">描述</a></li><li class="document-toc-item "><a class="document-toc-link" href="#值">值</a></li><li class="document-toc-item "><a class="document-toc-link" href="#关联角色">关联角色</a></li><li class="document-toc-item "><a class="document-toc-link" href="#规范">规范</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/zh-CN/docs/Web/Accessibility">无障碍</a></li><li><details><summary>指南</summary><ol><li><a href="/zh-CN/docs/Web/Accessibility/Information_for_Web_authors">Web 作者的无障碍信息</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Accessibility:_What_users_can_to_to_browse_safely">无障碍：用户如何更安全地浏览网页</a></li><li><a href="/zh-CN/docs/Web/Accessibility/An_overview_of_accessible_web_applications_and_widgets">无障碍 Web 应用和微件概述</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Keyboard-navigable_JavaScript_widgets">键盘导航的 JavaScript 微件</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Mobile_accessibility_checklist">移动无障碍清单</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG">理解 Web 内容无障碍指南</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Cognitive_accessibility">认知无障碍</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Accessibility_and_Spacial_Patterns">无障碍和空间模式</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_Colors_and_Luminance">Web 无障碍：理解颜色和亮度</a></li><li><a class="only-in-en-us" title="此页面目前仅提供英文版本" href="/en-US/docs/Web/Accessibility/Seizure_disorders">Web accessibility for seizures and physical reactions</a></li></ol></details></li><li><details><summary>学习无障碍</summary><ol><li><a href="/zh-CN/docs/Learn/Accessibility">无障碍</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/What_is_accessibility">什么是无障碍？</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/HTML">HTML：无障碍的良好基础</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/CSS_and_JavaScript">CSS 和 JavaScript 无障碍最佳实践</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/WAI-ARIA_basics">WAI-ARIA 基础</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/Multimedia">多媒体无障碍</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/Mobile">移动端无障碍</a></li><li><a href="/zh-CN/docs/Learn/Accessibility/Accessibility_troubleshooting">测验：无障碍疑难解答</a></li></ol></details></li><li><details><summary>WCAG</summary><ol><ol><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG">理解 Web 内容无障碍指南</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Keyboard">Keyboard</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Operable">Operable</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Perceivable">Perceivable</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Robust">Robust</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Text_labels_and_names">Text labels and names</a></li><li><a href="/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Understandable">Understandable</a></li></ol></ol></details></li><li class="section"><a href="/zh-CN/docs/Web/Accessibility/ARIA">ARIA</a></li><li><details><summary>ARIA 指南</summary><ol><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Guides">ARIA 指南</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Live_Regions">ARIA 实时区域</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Screen_Reader_Implementors_Guide">ARIA 屏幕阅读器实现指南</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Techniques">使用 ARIA：角色、状态和属性</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Multipart_labels">多部分标签：使用嵌入字段的标签的 ARIA</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/How_to_file_ARIA-related_bugs">如何提交与 ARIA 相关的错误</a></li></ol></details></li><li><details open=""><summary>ARIA 状态及属性</summary><ol><ol><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes">ARIA 状态及属性</a></li><li><em><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-activedescendant" aria-current="page">aria-activedescendant</a></em></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-atomic">aria-atomic</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-autocomplete">aria-autocomplete</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-braillelabel">aria-braillelabel</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-brailleroledescription">aria-brailleroledescription</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-busy">aria-busy</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-checked">aria-checked</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colcount">aria-colcount</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colindex">aria-colindex</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colindextext">aria-colindextext</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colspan">aria-colspan</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-controls">aria-controls</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-current">aria-current</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-describedby">aria-describedby</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-description">aria-description</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-details">aria-details</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-disabled">aria-disabled</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-dropeffect">aria-dropeffect</a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-errormessage">aria-errormessage</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-expanded">aria-expanded</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-flowto">aria-flowto</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-grabbed">aria-grabbed</a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-haspopup">aria-haspopup</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-hidden">aria-hidden</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-invalid">aria-invalid</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-keyshortcuts">aria-keyshortcuts</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-label">aria-label</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-labelledby">aria-labelledby</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-level">aria-level</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-live">aria-live</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-modal">aria-modal</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-multiline">aria-multiline</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-multiselectable">aria-multiselectable</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-orientation">aria-orientation</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-owns">aria-owns</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-placeholder">aria-placeholder</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-posinset">aria-posinset</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-pressed">aria-pressed</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-readonly">aria-readonly</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-relevant">aria-relevant</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-required">aria-required</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-roledescription">aria-roledescription</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowcount">aria-rowcount</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowindex">aria-rowindex</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowindextext">aria-rowindextext</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowspan">aria-rowspan</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-selected">aria-selected</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-setsize">aria-setsize</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-sort">aria-sort</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuemax">aria-valuemax</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuemin">aria-valuemin</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuenow">aria-valuenow</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuetext">aria-valuetext</a></li></ol></ol></details></li><li><details><summary>ARIA 角色</summary><ol><ol><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles">WAI-ARIA 角色</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/alert_role">ARIA: alert role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/alertdialog_role">ARIA: alertdialog role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/application_role">ARIA: application role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/article_role">ARIA: article role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/banner_role">ARIA: banner role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/button_role">ARIA：button 角色</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/cell_role">ARIA: cell role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/checkbox_role">ARIA: checkbox role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/columnheader_role">ARIA: columnheader role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/combobox_role">ARIA: combobox role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/command_role">ARIA: command role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/comment_role">ARIA: comment role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/complementary_role">ARIA: complementary role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/composite_role">ARIA: composite role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/contentinfo_role">ARIA: contentinfo role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/definition_role">ARIA: definition role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/dialog_role">ARIA: dialog role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/directory_role">ARIA: directory role</a><abbr class="icon icon-deprecated" title="已弃用。请不要在新的网站中使用。"> <span class="visually-hidden">已弃用</span> </abbr></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/document_role">ARIA: document role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/structural_roles">ARIA: document structural roles</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/feed_role">ARIA: feed role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/figure_role">ARIA: figure role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/form_role">ARIA: form role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/generic_role">ARIA: generic role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/grid_role">ARIA: grid role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/gridcell_role">ARIA: gridcell role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role">ARIA：group 角色</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/heading_role">ARIA: heading role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/img_role">ARIA: img role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/input_role">ARIA: input role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/landmark_role">ARIA: landmark role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/link_role">ARIA: link role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/list_role">ARIA：list 角色</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/listbox_role">ARIA：listbox 角色</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/listitem_role">ARIA：listitem 角色</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/log_role">ARIA: log role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/main_role">ARIA: main role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/mark_role">ARIA: mark role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/marquee_role">ARIA: marquee role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/math_role">ARIA: math role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/menu_role">ARIA: menu role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/menubar_role">ARIA: menubar role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/menuitem_role">ARIA: menuitem role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/menuitemcheckbox_role">ARIA: menuitemcheckbox role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/menuitemradio_role">ARIA: menuitemradio role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/meter_role">ARIA: meter role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/navigation_role">ARIA: navigation role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/none_role">ARIA: none role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/note_role">ARIA: note role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/option_role">ARIA: option role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/presentation_role">ARIA: presentation role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/progressbar_role">ARIA: progressbar role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/radio_role">ARIA: radio role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/radiogroup_role">ARIA: radiogroup role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/range_role">ARIA: range role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/region_role">ARIA: region role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/roletype_role">ARIA: roletype role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/row_role">ARIA: row role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/rowgroup_role">ARIA: rowgroup role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/rowheader_role">ARIA: rowheader role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/scrollbar_role">ARIA: scrollbar role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/search_role">ARIA: search role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/searchbox_role">ARIA: searchbox role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/section_role">ARIA: section role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/sectionhead_role">ARIA: sectionhead role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/select_role">ARIA: select role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/separator_role">ARIA: separator role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/slider_role">ARIA: slider role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/spinbutton_role">ARIA: spinbutton role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/status_role">ARIA: status role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/structure_role">ARIA: structure role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/suggestion_role">ARIA: suggestion role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/switch_role">ARIA: switch role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/tab_role">ARIA: tab role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/table_role">ARIA: table role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/tablist_role">ARIA: tablist role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/tabpanel_role">ARIA: tabpanel role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/term_role">ARIA: term role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/textbox_role">ARIA: textbox role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/timer_role">ARIA: timer role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/toolbar_role">ARIA: toolbar role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/tooltip_role">ARIA: tooltip role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/tree_role">ARIA: tree role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/treegrid_role">ARIA: treegrid role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/treeitem_role">ARIA: treeitem role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/widget_role">ARIA: widget role</a></li><li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/window_role">ARIA：window 角色</a></li></ol></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">在本文中</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#描述">描述</a></li><li class="document-toc-item "><a class="document-toc-link" href="#值">值</a></li><li class="document-toc-item "><a class="document-toc-link" href="#关联角色">关联角色</a></li><li class="document-toc-item "><a class="document-toc-link" href="#规范">规范</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="zh-CN"><header><h1>aria-activedescendant</h1></header><div class="section-content"><p><code>aria-activedescendant</code> 属性用于标识焦点位于 <a href="/en-US/docs/Web/Accessibility/ARIA/Roles/composite_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>composite</code></a> 微件、<a href="/en-US/docs/Web/Accessibility/ARIA/Roles/combobox_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>combobox</code></a>、<a href="/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>textbox</code></a>、<a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role"><code>group</code></a>或 <a href="/en-US/docs/Web/Accessibility/ARIA/Roles/application_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>application</code></a> 上时当前活动的元素。</p></div><section aria-labelledby="描述"><h2 id="描述"><a href="#描述">描述</a></h2><div class="section-content"><p><code>aria-activedescendant</code> 属性为辅助技术提供了一种在交互元素包含多个可聚焦后代时（例如菜单、网格和工具栏），进行焦点管理的方法。与屏幕阅读器在拥有的元素之间移动焦点不同，<code>aria-activedescendant</code> 可以在容器元素上使用，引用当前活动的元素，用于在聚焦时向辅助技术用户指示当前活动的元素。</p> <p>使用 <code>aria-activedescendant</code>，浏览器会将 DOM 焦点保持在容器元素或控制容器元素的输入元素上。但是，用户代理将桌面聚焦事件和状态发送给辅助技术，就好像 <code>aria-activedescendant</code> 引用的元素具有焦点一样。</p> <p>此属性仅适用于具有 <a href="/en-US/docs/Web/Accessibility/ARIA/Roles/composite_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>composite</code></a> 微件、<a href="/en-US/docs/Web/Accessibility/ARIA/Roles/combobox_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>combobox</code></a>、<a href="/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>textbox</code></a>、<a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role"><code>group</code></a> 或 <a href="/en-US/docs/Web/Accessibility/ARIA/Roles/application_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>application</code></a> 角色的元素，其 <code>id</code> 被引用为属性值。</p> <p>该属性用于为辅助技术提供有关焦点位于哪个元素的信息，但实际上不会创建焦点。使用 JavaScript 来更改焦点并管理属性值。除了管理该属性值之外，确保当前活动的后代在聚焦时可见并在视野内（或滚动到视野内）。</p> <p>在具有 DOM 焦点的元素上设置 <code>aria-activedescendant</code> 的值时，确保该值引用所拥有的元素——即 DOM 焦点元素的后代或由 <a href="/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-owns" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>aria-owns</code></a> 属性指示的逻辑后代。</p> <p>当具有 DOM 焦点的元素是组合框、文本框或搜索框时，请包括 <a href="/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-controls" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>aria-controls</code></a> 以引用支持 <code>aria-activedescendant</code> 的元素。</p> <p><code>aria-activedescendant</code> 的值引用受控元素所拥有的元素。例如，在组合框中，焦点可能仍然位于组合框上，但组合框元素上的 <code>aria-activedescendant</code> 的值引用由组合框控制的弹出列表框的后代。</p> <div class="notecard note"> <p><strong>备注：</strong>该属性仅支持少数角色。例如，<code>dialog</code> 不支持 <code>aria-activedescendant</code>。当组合框打开对话框时，DOM 焦点从组合框移动到对话框，因为它不能通过此属性进行引用。</p> </div> <div class="notecard note"> <p><strong>备注：</strong>当焦点位于 <code>listbox</code>、<code>grid</code> 或 <code>tree</code> 弹出窗口的后代时，DOM 焦点保持在组合框上，并且组合框的 <code>aria-activedescendant</code> 设置为引用弹出窗口内的焦点元素的值。</p> </div></div></section><section aria-labelledby="值"><h2 id="值"><a href="#值">值</a></h2><div class="section-content"><dl> <dt id="id_引用"><a href="#id_引用">ID 引用</a></dt> <dd> <p>其值为当前具有焦点元素的 <code>id</code>。</p> </dd> </dl></div></section><section aria-labelledby="关联角色"><h2 id="关联角色"><a href="#关联角色">关联角色</a></h2><div class="section-content"><p>仅适用于具有以下角色的元素的属性：</p> <ul> <li><a href="/en-US/docs/Web/Accessibility/ARIA/Roles/application_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>application</code></a></li> <li><a href="/en-US/docs/Web/Accessibility/ARIA/Roles/combobox_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>combobox</code></a></li> <li><a href="/en-US/docs/Web/Accessibility/ARIA/Roles/composite_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>composite</code></a></li> <li><a href="/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role"><code>group</code></a></li> <li><a href="/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role" class="only-in-en-us" title="此页面目前仅提供英文版本"><code>textbox</code></a></li> </ul></div></section><h2 id="规范"><a href="#规范">规范</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://w3c.github.io/aria/#aria-activedescendant">Accessible Rich Internet Applications (WAI-ARIA) <br/><small># aria-activedescendant</small></a></td></tr><tr><td><a href="https://www.w3.org/TR/wai-aria-1.2/#aria-activedescendant">Accessible Rich Internet Applications (WAI-ARIA) <br/><small># aria-activedescendant</small></a></td></tr></tbody></table></article><aside class="article-footer"><div class="article-footer-inner"><div 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Content available under <a href="/zh-CN/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-activedescendant","doc":{"isMarkdown":true,"isTranslated":true,"isActive":true,"flaws":{},"title":"aria-activedescendant","mdn_url":"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-activedescendant","locale":"zh-CN","native":"中文 (简体)","sidebarHTML":"<ol><li class=\"section\"><a href=\"/zh-CN/docs/Web/Accessibility\">无障碍</a></li><li><details><summary>指南</summary><ol><li><a href=\"/zh-CN/docs/Web/Accessibility/Information_for_Web_authors\">Web 作者的无障碍信息</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Accessibility:_What_users_can_to_to_browse_safely\">无障碍：用户如何更安全地浏览网页</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/An_overview_of_accessible_web_applications_and_widgets\">无障碍 Web 应用和微件概述</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Keyboard-navigable_JavaScript_widgets\">键盘导航的 JavaScript 微件</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Mobile_accessibility_checklist\">移动无障碍清单</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG\">理解 Web 内容无障碍指南</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Cognitive_accessibility\">认知无障碍</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Accessibility_and_Spacial_Patterns\">无障碍和空间模式</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_Colors_and_Luminance\">Web 无障碍：理解颜色和亮度</a></li><li><a class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\" href=\"/en-US/docs/Web/Accessibility/Seizure_disorders\">Web accessibility for seizures and physical reactions</a></li></ol></details></li><li><details><summary>学习无障碍</summary><ol><li><a href=\"/zh-CN/docs/Learn/Accessibility\">无障碍</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/What_is_accessibility\">什么是无障碍？</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/HTML\">HTML：无障碍的良好基础</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/CSS_and_JavaScript\">CSS 和 JavaScript 无障碍最佳实践</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/WAI-ARIA_basics\">WAI-ARIA 基础</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/Multimedia\">多媒体无障碍</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/Mobile\">移动端无障碍</a></li><li><a href=\"/zh-CN/docs/Learn/Accessibility/Accessibility_troubleshooting\">测验：无障碍疑难解答</a></li></ol></details></li><li><details><summary>WCAG</summary><ol><ol><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG\">理解 Web 内容无障碍指南</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Keyboard\">Keyboard</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Operable\">Operable</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Perceivable\">Perceivable</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Robust\">Robust</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Text_labels_and_names\">Text labels and names</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/Understanding_WCAG/Understandable\">Understandable</a></li></ol></ol></details></li><li class=\"section\"><a href=\"/zh-CN/docs/Web/Accessibility/ARIA\">ARIA</a></li><li><details><summary>ARIA 指南</summary><ol><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Guides\">ARIA 指南</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Live_Regions\">ARIA 实时区域</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Screen_Reader_Implementors_Guide\">ARIA 屏幕阅读器实现指南</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/ARIA_Techniques\">使用 ARIA：角色、状态和属性</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Multipart_labels\">多部分标签：使用嵌入字段的标签的 ARIA</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/How_to_file_ARIA-related_bugs\">如何提交与 ARIA 相关的错误</a></li></ol></details></li><li><details open=\"\"><summary>ARIA 状态及属性</summary><ol><ol><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes\">ARIA 状态及属性</a></li><li><em><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-activedescendant\" aria-current=\"page\">aria-activedescendant</a></em></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-atomic\">aria-atomic</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-autocomplete\">aria-autocomplete</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-braillelabel\">aria-braillelabel</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-brailleroledescription\">aria-brailleroledescription</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-busy\">aria-busy</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-checked\">aria-checked</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colcount\">aria-colcount</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colindex\">aria-colindex</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colindextext\">aria-colindextext</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-colspan\">aria-colspan</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-controls\">aria-controls</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-current\">aria-current</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-describedby\">aria-describedby</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-description\">aria-description</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-details\">aria-details</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-disabled\">aria-disabled</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-dropeffect\">aria-dropeffect</a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-errormessage\">aria-errormessage</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-expanded\">aria-expanded</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-flowto\">aria-flowto</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-grabbed\">aria-grabbed</a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-haspopup\">aria-haspopup</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-hidden\">aria-hidden</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-invalid\">aria-invalid</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-keyshortcuts\">aria-keyshortcuts</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-label\">aria-label</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-labelledby\">aria-labelledby</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-level\">aria-level</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-live\">aria-live</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-modal\">aria-modal</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-multiline\">aria-multiline</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-multiselectable\">aria-multiselectable</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-orientation\">aria-orientation</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-owns\">aria-owns</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-placeholder\">aria-placeholder</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-posinset\">aria-posinset</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-pressed\">aria-pressed</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-readonly\">aria-readonly</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-relevant\">aria-relevant</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-required\">aria-required</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-roledescription\">aria-roledescription</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowcount\">aria-rowcount</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowindex\">aria-rowindex</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowindextext\">aria-rowindextext</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-rowspan\">aria-rowspan</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-selected\">aria-selected</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-setsize\">aria-setsize</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-sort\">aria-sort</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuemax\">aria-valuemax</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuemin\">aria-valuemin</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuenow\">aria-valuenow</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-valuetext\">aria-valuetext</a></li></ol></ol></details></li><li><details><summary>ARIA 角色</summary><ol><ol><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles\">WAI-ARIA 角色</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/alert_role\">ARIA: alert role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/alertdialog_role\">ARIA: alertdialog role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/application_role\">ARIA: application role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/article_role\">ARIA: article role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/banner_role\">ARIA: banner role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/button_role\">ARIA：button 角色</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/cell_role\">ARIA: cell role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/checkbox_role\">ARIA: checkbox role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/columnheader_role\">ARIA: columnheader role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/combobox_role\">ARIA: combobox role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/command_role\">ARIA: command role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/comment_role\">ARIA: comment role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/complementary_role\">ARIA: complementary role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/composite_role\">ARIA: composite role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/contentinfo_role\">ARIA: contentinfo role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/definition_role\">ARIA: definition role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/dialog_role\">ARIA: dialog role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/directory_role\">ARIA: directory role</a><abbr class=\"icon icon-deprecated\" title=\"已弃用。请不要在新的网站中使用。\">\n <span class=\"visually-hidden\">已弃用</span>\n</abbr></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/document_role\">ARIA: document role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/structural_roles\">ARIA: document structural roles</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/feed_role\">ARIA: feed role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/figure_role\">ARIA: figure role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/form_role\">ARIA: form role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/generic_role\">ARIA: generic role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/grid_role\">ARIA: grid role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/gridcell_role\">ARIA: gridcell role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role\">ARIA：group 角色</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/heading_role\">ARIA: heading role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/img_role\">ARIA: img role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/input_role\">ARIA: input role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/landmark_role\">ARIA: landmark role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/link_role\">ARIA: link role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/list_role\">ARIA：list 角色</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/listbox_role\">ARIA：listbox 角色</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/listitem_role\">ARIA：listitem 角色</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/log_role\">ARIA: log role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/main_role\">ARIA: main role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/mark_role\">ARIA: mark role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/marquee_role\">ARIA: marquee role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/math_role\">ARIA: math role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/menu_role\">ARIA: menu role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/menubar_role\">ARIA: menubar role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/menuitem_role\">ARIA: menuitem role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/menuitemcheckbox_role\">ARIA: menuitemcheckbox role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/menuitemradio_role\">ARIA: menuitemradio role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/meter_role\">ARIA: meter role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/navigation_role\">ARIA: navigation role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/none_role\">ARIA: none role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/note_role\">ARIA: note role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/option_role\">ARIA: option role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/presentation_role\">ARIA: presentation role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/progressbar_role\">ARIA: progressbar role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/radio_role\">ARIA: radio role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/radiogroup_role\">ARIA: radiogroup role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/range_role\">ARIA: range role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/region_role\">ARIA: region role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/roletype_role\">ARIA: roletype role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/row_role\">ARIA: row role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/rowgroup_role\">ARIA: rowgroup role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/rowheader_role\">ARIA: rowheader role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/scrollbar_role\">ARIA: scrollbar role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/search_role\">ARIA: search role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/searchbox_role\">ARIA: searchbox role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/section_role\">ARIA: section role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/sectionhead_role\">ARIA: sectionhead role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/select_role\">ARIA: select role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/separator_role\">ARIA: separator role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/slider_role\">ARIA: slider role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/spinbutton_role\">ARIA: spinbutton role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/status_role\">ARIA: status role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/structure_role\">ARIA: structure role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/suggestion_role\">ARIA: suggestion role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/switch_role\">ARIA: switch role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/tab_role\">ARIA: tab role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/table_role\">ARIA: table role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/tablist_role\">ARIA: tablist role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/tabpanel_role\">ARIA: tabpanel role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/term_role\">ARIA: term role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/textbox_role\">ARIA: textbox role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/timer_role\">ARIA: timer role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/toolbar_role\">ARIA: toolbar role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/tooltip_role\">ARIA: tooltip role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/tree_role\">ARIA: tree role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/treegrid_role\">ARIA: treegrid role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/treeitem_role\">ARIA: treeitem role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/widget_role\">ARIA: widget role</a></li><li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/window_role\">ARIA：window 角色</a></li></ol></ol></details></li></ol>","sidebarMacro":"AccessibilitySidebar","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<p><code>aria-activedescendant</code> 属性用于标识焦点位于 <a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/composite_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>composite</code></a> 微件、<a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/combobox_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>combobox</code></a>、<a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>textbox</code></a>、<a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role\"><code>group</code></a>或 <a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/application_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>application</code></a> 上时当前活动的元素。</p>"}},{"type":"prose","value":{"id":"描述","title":"描述","isH3":false,"content":"<p><code>aria-activedescendant</code> 属性为辅助技术提供了一种在交互元素包含多个可聚焦后代时（例如菜单、网格和工具栏），进行焦点管理的方法。与屏幕阅读器在拥有的元素之间移动焦点不同，<code>aria-activedescendant</code> 可以在容器元素上使用，引用当前活动的元素，用于在聚焦时向辅助技术用户指示当前活动的元素。</p>\n<p>使用 <code>aria-activedescendant</code>，浏览器会将 DOM 焦点保持在容器元素或控制容器元素的输入元素上。但是，用户代理将桌面聚焦事件和状态发送给辅助技术，就好像 <code>aria-activedescendant</code> 引用的元素具有焦点一样。</p>\n<p>此属性仅适用于具有 <a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/composite_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>composite</code></a> 微件、<a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/combobox_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>combobox</code></a>、<a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>textbox</code></a>、<a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role\"><code>group</code></a> 或 <a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/application_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>application</code></a> 角色的元素，其 <code>id</code> 被引用为属性值。</p>\n<p>该属性用于为辅助技术提供有关焦点位于哪个元素的信息，但实际上不会创建焦点。使用 JavaScript 来更改焦点并管理属性值。除了管理该属性值之外，确保当前活动的后代在聚焦时可见并在视野内（或滚动到视野内）。</p>\n<p>在具有 DOM 焦点的元素上设置 <code>aria-activedescendant</code> 的值时，确保该值引用所拥有的元素——即 DOM 焦点元素的后代或由 <a href=\"/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-owns\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>aria-owns</code></a> 属性指示的逻辑后代。</p>\n<p>当具有 DOM 焦点的元素是组合框、文本框或搜索框时，请包括 <a href=\"/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-controls\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>aria-controls</code></a> 以引用支持 <code>aria-activedescendant</code> 的元素。</p>\n<p><code>aria-activedescendant</code> 的值引用受控元素所拥有的元素。例如，在组合框中，焦点可能仍然位于组合框上，但组合框元素上的 <code>aria-activedescendant</code> 的值引用由组合框控制的弹出列表框的后代。</p>\n<div class=\"notecard note\">\n <p><strong>备注：</strong>该属性仅支持少数角色。例如，<code>dialog</code> 不支持 <code>aria-activedescendant</code>。当组合框打开对话框时，DOM 焦点从组合框移动到对话框，因为它不能通过此属性进行引用。</p>\n</div>\n<div class=\"notecard note\">\n <p><strong>备注：</strong>当焦点位于 <code>listbox</code>、<code>grid</code> 或 <code>tree</code> 弹出窗口的后代时，DOM 焦点保持在组合框上，并且组合框的 <code>aria-activedescendant</code> 设置为引用弹出窗口内的焦点元素的值。</p>\n</div>"}},{"type":"prose","value":{"id":"值","title":"值","isH3":false,"content":"<dl>\n <dt id=\"id_引用\"><a href=\"#id_引用\">ID 引用</a></dt>\n <dd>\n <p>其值为当前具有焦点元素的 <code>id</code>。</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"关联角色","title":"关联角色","isH3":false,"content":"<p>仅适用于具有以下角色的元素的属性：</p>\n<ul>\n <li><a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/application_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>application</code></a></li>\n <li><a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/combobox_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>combobox</code></a></li>\n <li><a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/composite_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>composite</code></a></li>\n <li><a href=\"/zh-CN/docs/Web/Accessibility/ARIA/Roles/group_role\"><code>group</code></a></li>\n <li><a href=\"/en-US/docs/Web/Accessibility/ARIA/Roles/textbox_role\" class=\"only-in-en-us\" title=\"此页面目前仅提供英文版本\"><code>textbox</code></a></li>\n</ul>"}},{"type":"specifications","value":{"title":"规范","id":"规范","isH3":false,"specifications":[{"bcdSpecificationURL":"https://w3c.github.io/aria/#aria-activedescendant","title":"Accessible Rich Internet Applications (WAI-ARIA)"},{"bcdSpecificationURL":"https://www.w3.org/TR/wai-aria-1.2/#aria-activedescendant","title":"Accessible Rich Internet Applications (WAI-ARIA)"}],"query":"undefined"}}],"toc":[{"text":"描述","id":"描述"},{"text":"值","id":"值"},{"text":"关联角色","id":"关联角色"},{"text":"规范","id":"规范"}],"summary":"aria-activedescendant 属性用于标识焦点位于 composite 微件、combobox、textbox、group或 application 上时当前活动的元素。","popularity":0,"modified":"2024-07-27T04:01:26.000Z","other_translations":[{"locale":"de","title":"aria-activedescendant","native":"Deutsch"},{"locale":"en-US","title":"aria-activedescendant","native":"English (US)"},{"locale":"ja","title":"aria-activedescendant","native":"日本語"}],"pageType":"unknown","source":{"folder":"zh-cn/web/accessibility/aria/attributes/aria-activedescendant","github_url":"https://github.com/mdn/translated-content/blob/main/files/zh-cn/web/accessibility/aria/attributes/aria-activedescendant/index.md","last_commit_url":"https://github.com/mdn/translated-content/commit/9615d161268fd8b09648f24d86441fb966c630d3","filename":"index.md"},"short_title":"aria-activedescendant","parents":[{"uri":"/zh-CN/docs/Web","title":"面向开发者的 Web 技术"},{"uri":"/zh-CN/docs/Web/Accessibility","title":"无障碍"},{"uri":"/zh-CN/docs/Web/Accessibility/ARIA","title":"ARIA"},{"uri":"/zh-CN/docs/Web/Accessibility/ARIA/Attributes","title":"ARIA 状态及属性"},{"uri":"/zh-CN/docs/Web/Accessibility/ARIA/Attributes/aria-activedescendant","title":"aria-activedescendant"}],"pageTitle":"aria-activedescendant - 无障碍 | MDN","noIndexing":false}}</script></body></html>