For AI agents: the complete documentation index is available at https://a3s-lab.github.io/Office/docs/0.303.0/en/llms.txt, the full documentation bundle is available at https://a3s-lab.github.io/Office/docs/0.303.0/en/llms-full.txt, and this page is available as Markdown at https://a3s-lab.github.io/Office/docs/0.303.0/en/index.md.
A3S Office
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  • 0.303.0

      • A3S Office 0.303.0 documentation

      This is the frozen documentation index for A3S Office 0.303.0. Use it to find integration guides, API references, and engineering notes.

      Start here

      GoalDocumentation
      Mount the first controlled editorGetting started
      Choose React, Vue, or Web ComponentComponent integration
      Configure an editor and its content modelEditor APIs
      Add host actions or TipTap extensionsExtension model
      Let people and agents edit one file liveReal-time collaboration
      Deploy an authenticated, persistent backendA3S Boot collaboration server
      Process Office files from a coding agentCLI and Skill
      See what changed in recent releasesWhat's new

      Editor components

      File typePublic componentContent model and implementation
      DocumentDocumentEditorDocumentContent; TipTap / ProseMirror and the A3S Office layout kernel
      MarkdownMarkdownEditorMarkdownContent; visual editing with a controlled source
      SpreadsheetSpreadsheetEditorSpreadsheetContent; sparse workbook and calculation kernel
      PresentationPresentationEditorPresentationContent; scene graph with on-demand text editing
      PDFPdfViewerBlob input/output; PDFium WebAssembly and annotation controllers

      All framework bindings share the controlled-component contract. The host owns content, persistence, permissions, and lifecycle; editors report state changes through typed properties and events.

      Real-time collaboration

      The collaboration protocol covers all five editors and all three framework bindings. Browsers use Yjs and native agents use Yrs. The host owns rooms, identity, authorization, providers, offline buffering, and persistence.

      What's new on main (0.303.0)

      Keep Markdown replacement on the find-hit offset:

      • markdown-replace-text accepts optional indexUtf16 from collab find.
      • A drifted offset fails closed even when the match count is unchanged.
      • Omit indexUtf16 to keep the existing match-count contract.

      Explore by surface

      Curated entry points for durable capabilities. Prefer these over scanning every historical release note.

      SurfaceStart with
      DocumentWhole-paragraph mark revisions · Move revisions · Compare moves · Numbering revisions · OpenType typography · Content controls · Live fields · Text boxes and connectors · Picture properties · Selection toolbar
      SpreadsheetDependent dropdowns · Formula conditional formatting · Custom formulas · Error-alert branches · 1900/1904 date systems
      PresentationEntrance and exit animations
      PDFPage organization
      AutomationA3S Test gates, template discovery, and operator workflows
      ReleasesVersion-aware What's new

      Engineering references

      TopicReference
      Browser components, Workers, and WebAssembly boundariesBrowser editor architecture
      Rust core, CLI, MCP, and local filesNative Office engine
      Quality gates, performance metrics, and compatibilityEditor quality roadmap
      Commands, selectors, and JSON protocolCLI reference

      Languages and versions

      Use the language and version controls in the page header to switch between Simplified Chinese, English, and frozen releases. Search remains scoped to the active language and version so API results from different releases are never mixed.