> ## Documentation Index > Fetch the complete documentation index at: https://docs.acondawayuno.com/llms.txt > Use this file to discover all available pages before exploring further. # Accessibility > Keyboard, semantic-index, dialog, reduced-motion, and WebGL-fallback behavior for built-in and custom assets. The accessibility model does not require a visitor to understand or operate a 3D canvas. Every **active interactive** asset must have an equivalent HTML chapter in the content index and detail dialog. 无障碍目标不是让读屏软件解释三维模型，而是保证访客不进入 3D 也能访问每一个当前启用的 交互章节。 ## Semantic parity / 语义等价 The active interactive set is: * enabled built-in assets; plus * custom assets whose behavior is `interactive`. Disabled built-ins and decorative custom assets are intentionally excluded from the interactive index and deep links. When adding a custom interactive asset, provide localized object labels, titles, introductions, and card content so the DOM experience is meaningful without the model. The starter ships with 12 built-in chapters, but 12 is not a runtime invariant. The accessible index follows the current scene configuration. ## Keyboard paths / 键盘路径 | Key | Action | | --------------------- | --------------------------------------- | | `Tab` / `Shift + Tab` | Move through controls and index entries | | `Enter` / `Space` | Activate a focused button or chapter | | `Esc` | Close the active overlay or panel | | Arrow keys | Orbit the focused room canvas | | `+` / `-` | Zoom the focused room canvas | | `R` | Reset the camera | The first keyboard path includes a skip link that opens the content index without requiring canvas interaction. When a detail dialog opens, focus moves to its close control; closing attempts to restore focus to the source element. ## Dialogs and names / 对话框与名称 Content, instant-photo, help, and modal Studio surfaces use semantic dialog roles and accessible labels. The canvas is a focusable region with instructions, while the index supplies ordinary HTML buttons and text for assistive technology. When extending the interface: * give every icon-only control an accessible name; * associate form labels, descriptions, validation, and live status text; * preserve the close-and-return focus behavior; * do not make color the only indication of loading, error, selection, or interactivity; * keep decorative scene objects out of the tab order. ## Reduced motion / 减少动态效果 The room checks `prefers-reduced-motion`. Camera focus transitions jump rather than tween when reduction is requested, and CSS disables or shortens non-essential interface motion. Test both settings after adding animation. A procedural decoration should either stop, become substantially calmer, or remain purely static when motion is not necessary to understand it. ## WebGL and JavaScript fallback / 降级体验 If WebGL initialization or the context fails, the application exposes the lightweight semantic index for active interactive content. A `