What’s new in RichTextBox

Dictation New

New plugins/dictation.js adds a toolbar microphone button that converts speech to text via the Web Speech API. Interim transcripts render live under the cursor; auto-punctuation, BCP-47 language setting, continuous vs one-shot modes.

Enable: <richtextbox enable-dictation="true" dictation-lang="en-US" /> · Live demo

Mobile toolbar mode New

Opt-in stylesheet rte_mobile.css + Tag Helper attribute that lights up the editor’s built-in mobile toolbar: 44×44 tap targets (WCAG 2.5.5), horizontally-scrolling toolbar strip, sticky header above the virtual keyboard, bottom-sheet mounting for dropdowns / dialogs / review drawer, 16px content font to suppress iOS auto-zoom.

Enable: enable-mobile-toolbar="true" · Live demo

Paste from Word — improved list fidelity Fixed

Rewrote the _ConvertWordLists routine. Previously all Word lists became <ul> at level 1; now ordered vs unordered is detected from the marker span, nesting depth is parsed from mso-list: l{N} level{M}, and bullet glyphs are stripped correctly (·, •, ◦, §, etc. plus HTML entities).

Tag Helper: enable-mobile-toolbar now wires config.toolbarMobile

The attribute now configures the editor’s built-in auto-switch (set toolbarMobile="mobile", provide a compact toolbar_mobile item list, bump maxWidthForMobile to 720px). Desktop viewers see the full toolbar you configured; narrow viewports automatically swap in.

DOCX export New

Server-side HTML → .docx converter built on MIT-licensed DocumentFormat.OpenXml. MapRichTextBoxUploads() automatically maps POST /richtextbox/export/docx. Supports paragraphs, h1–h6, blockquote, pre, lists (nested), tables, inline formatting, hyperlinks, data-URI images, text-alignment / color / background-color style attrs.

Client: editor.aiToolkit.exportDocx({ url, fileName, title }) helper triggers a browser download via Blob + anchor · Live demo

Migration note. The package now has a transitive dependency on DocumentFormat.OpenXml 3.1.0. If you pin dependencies, add it to your csproj explicitly.

Revision history: named versions + diff API New

Three new JS methods on editor.revisionHistory:

• promptAndSnapshot(defaultLabel?) — native prompt + snapshot.
• rename(id, label) — rename an existing snapshot.
• listNamed() — only user-labeled snapshots (“Draft sent to legal”, “v1 final”).
• diff(idA, idB) — { oldEntry, newEntry, oldText, newText, lines[] } so callers can build side-by-side diff UI.

Each entry carries a new isNamed boolean that round-trips through localStorage and the optional server endpoint.

Streaming AI responses New

The OpenAI and Anthropic resolvers now implement IStreamingRichTextBoxAiResolver. MapRichTextBoxUploads() also maps POST /richtextbox/ai/stream which relays provider text deltas as Server-Sent Events. Non-streaming providers fall back to a single frame transparently.

Client: editor.aiToolkit.streamRequest({ url, body, onDelta, onResponse, onDone, onError }) consumes the SSE via fetch + ReadableStream, with XHR fallback. Returns { promise, abort() }. · Demo

Yjs concurrent typing (preview) Preview

editor.collab.attach({ doc, provider, textSync: true }) now binds the editor’s full HTML to a shared Y.Text. Concurrent inserts / deletes merge via CRDT — two users typing in different parts of the document both see their edits survive.

Known tradeoff: remote updates re-set the body (caret snaps to start) and HTML character offsets don’t align with rendered caret offsets. Per-node binding (y-xml-fragment style) is planned. This preview closes the “two users typing” RFP checkbox today. · Demo

Accessibility Statement New

Published our WCAG 2.2 AA self-assessment — what works, known gaps called out honestly, supported AT combinations (NVDA, JAWS, VoiceOver, TalkBack), and a reporting channel at [email protected]. A third-party audit + VPAT 2.5 is on the 2026 roadmap.

First-party AI provider resolvers New

Three drop-in IRichTextBoxAiResolver implementations so the AI Toolkit lights up without writing HTTP client boilerplate:

• AddRichTextBoxOpenAiResolver(...) — also works with OpenAI-compatible endpoints (Groq, Together, local Ollama) via BaseUrl.
• AddRichTextBoxAnthropicResolver(...) — Claude. Handles the content-block response array automatically.
• AddRichTextBoxAzureOpenAiResolver(...) — deployment-scoped with separate Endpoint + DeploymentName.

Shared AiResolverOptions: ApiKey, Model, BaseUrl, MaxTokens, Temperature, SystemSuffix, Timeout. Mode-specific system prompts centralized in AiResolverPromptTemplates. All three use HttpClientFactory, support cancellation, log failures via ILogger<T> (API key never logged).

Live demo

v2.0 Collaboration & Review plugins New

Six plugins ship together, all toggleable via Tag Helper attributes — the full review stack that TinyMCE 7 and CKEditor 5 gate behind their premium tiers:

• Slash commands (enable-slash-commands) — type / to insert headings, lists, tables, code blocks, AI actions.
• @Mentions (enable-mentions) — trigger-character framework for @, #, [[wiki]]; async data sources with debounce.
• Track Changes (enable-tracked-changes) — Word-style human suggesting mode, per-author accept / reject.
• Threaded comments (enable-comments) — anchored to selection ranges, with replies, resolve, delete.
• Revision history (enable-revision-history) — snapshot browser with LCS line diff.
• Yjs presence (enable-collab) — live cursors + shared review ledger via a peer-dependency Yjs provider.

All six share a single editor.reviewLedger store so AI suggestions, human tracked-change suggestions, and comments show up interleaved in the same Review drawer.