# Changelog All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html). Note: - Web developers are advised to use [`~` (tilde range)](https://github.com/npm/node-semver?tab=readme-ov-file#tilde-ranges-123-12-1) to select minor versions, which contains new features and/or fixes. Use [`^` (caret range)](https://github.com/npm/node-semver?tab=readme-ov-file#caret-ranges-123-025-004) to select major versions, which may contains breaking changes Legends: - ๐Ÿ’ฅ are breaking changes - ๐Ÿ› are known issues - ๐Ÿงช are experimental changes - ๐Ÿซ are samples - ๐Ÿ‘ท๐Ÿป are development environment changes ## [Unreleased] ## [4.19.2] - 2026-10-08 ### Added - Added `styleOptions.richCardTitleOmitHeadingRole` (default `false`) to opt out of `style: 'heading'` on rich card titles, in PR [#5839](https://github.com/microsoft/BotFramework-WebChat/pull/5839), by [@cjennison](https://github.com/cjennison) - ~~Added support of Adaptive Cards `Action.Submit` action with `msteams/signin` sub-action to open sign-in link in a popup window, in PR [#5860](https://github.com/microsoft/BotFramework-WebChat/pull/5860), by [@compulim](https://github.com/compulim)~~ - ~~Added `styleOptions.adaptiveCardSignInActionPopupWindowHeight/Width` for sizing the sign-in popup window~~ - ~~Link to [Adaptive Cards spec](https://adaptivecards.microsoft.com/?topic=SigninSubmitActionData)~~ - ~~Refer to [this test](./__tests__/html2/adaptiveCard/signInAction.html) for the reference payload~~ - ~~Note: this implementation is based on observation of how Microsoft Teams behave and could deviate from their official implementation~~ - Obsoleted in favor of PR [#5862](https://github.com/microsoft/BotFramework-WebChat/pull/5862) - Added card action `webchat:callURL` and [Adaptive Card action `Action.OpenUrlDialog`](https://adaptivecards.microsoft.com/?topic=Action.OpenUrlDialog) - The card action is designed to host popup for authentication and authorization (call-and-return pattern), it can optionally send a postback message to the bot - Open in popup, in PR [#5862](https://github.com/microsoft/BotFramework-WebChat/pull/5862), by [@compulim](https://github.com/compulim) - Added `styleOptions.callURLActionPopupWindowHeight/Width` for sizing the popup window - URL must be absolute with scheme of either http:// or https:// - Reference payload for Direct Line `webchat:callURL` card action can be found in [this test](./__tests__/html2/adaptiveCard/openUrlDialog/heroCard.html) - Reference payload for Adaptive Card `Action.OpenUrlDialog` can be found in [this test](./__tests__/html2/adaptiveCard/openUrlDialog/simple.html) - Note: the Adaptive Card implementation is based on observation of how other apps behave and could deviate from their official implementation - Adaptive Card: `dialogHeight`, `dialogTitle`, and `dialogWidth` are ignored, use `styleOptions.callURLActionPopupWindowHeight/Width` for dialog sizing instead - Trusted popup can send postback message, in PR [#5863](https://github.com/microsoft/BotFramework-WebChat/pull/5863), by [@compulim](https://github.com/compulim) - Popup window can be opened as trusted or untrusted based on their origin - Trusted popup will have access to `window.opener` and can send postback value - Untrusted popup will be opened with `noopener noreferrer` and they cannot send postback value - Same origin is always trusted, multiple cross origins can be trusted via the new `styleOptions.callURLActionTrustedOrigin` style option - Content in trusted popup could potentially access data and manipulate the page in the origin where Web Chat is hosted. Content must be well-maintained and frequently audited. In a trusted popup, never redirect to an untrusted cross origin - To send a postback value, call `window.opener.postMessage({ type: 'postback', value: {} | string }, '...')` - Postback is only accepted within 5 minutes after the popup window is opened and from a trusted origin - Each popup window can only send at most one postback, subsequent postbacks are ignored - `replyToId` will be automatically filled in by the ID of the originating activity ### Fixed - Fixed an error when a failed activity is present when Web Chat mounts, resolving [#5812](https://github.com/microsoft/BotFramework-WebChat/issues/5812), in PR [#5848](https://github.com/microsoft/BotFramework-WebChat/pull/5848), by [@OEvgeny](https://github.com/OEvgeny) ## [4.19.1] - 2026-06-09 ### Changed - Removed `markdown-it` and completed migration to `micromark`, in PR [#5825](https://github.com/microsoft/BotFramework-WebChat/pull/5825), by [@compulim](https://github.com/compulim) - Bumped dependencies, by [@compulim](https://github.com/compulim) in PR [#5836](https://github.com/microsoft/BotFramework-WebChat/pull/5836) - Production dependencies - [`@babel/runtime@7.29.7`](https://npmjs.com/package/@babel/runtime/v/7.29.7) - [`html-react-parser@6.1.2`](https://npmjs.com/package/html-react-parser/v/6.1.2) - [`katex@0.17.0`](https://npmjs.com/package/katex/v/0.17.0) - [`microsoft-cognitiveservices-speech-sdk@1.50.0`](https://npmjs.com/package/microsoft-cognitiveservices-speech-sdk/v/1.50.0) - [`redux-saga@1.5.0`](https://npmjs.com/package/redux-saga/v/1.5.0) - [`uuid@14.0.0`](https://npmjs.com/package/uuid/v/14.0.0) - [`valibot@1.4.1`](https://npmjs.com/package/valibot/v/1.4.1) - Development dependencies - [`@ast-grep/napi@0.43.0`](https://npmjs.com/package/@ast-grep/napi/v/0.43.0) - [`@babel/cli@7.29.7`](https://npmjs.com/package/@babel/cli/v/7.29.7) - [`@babel/core@7.29.7`](https://npmjs.com/package/@babel/core/v/7.29.7) - [`@babel/plugin-transform-runtime@7.29.7`](https://npmjs.com/package/@babel/plugin-transform-runtime/v/7.29.7) - [`@babel/plugin-transform-typescript@7.29.7`](https://npmjs.com/package/@babel/plugin-transform-typescript/v/7.29.7) - [`@babel/preset-env@7.29.7`](https://npmjs.com/package/@babel/preset-env/v/7.29.7) - [`@babel/preset-react@7.29.7`](https://npmjs.com/package/@babel/preset-react/v/7.29.7) - [`@babel/preset-typescript@7.29.7`](https://npmjs.com/package/@babel/preset-typescript/v/7.29.7) - [`@babel/runtime@7.29.7`](https://npmjs.com/package/@babel/runtime/v/7.29.7) - [`@biomejs/biome@2.4.16`](https://npmjs.com/package/@biomejs/biome/v/2.4.16) - [`@fluentui/react-provider@9.22.17`](https://npmjs.com/package/@fluentui/react-provider/v/9.22.17) - [`@types/dom-speech-recognition@0.0.11`](https://npmjs.com/package/@types/dom-speech-recognition/v/0.0.11) - [`@types/node@25.9.1`](https://npmjs.com/package/@types/node/v/25.9.1) - [`@types/react@16.14.70`](https://npmjs.com/package/@types/react/v/16.14.70) - [`@typescript-eslint/eslint-plugin@8.60.0`](https://npmjs.com/package/@typescript-eslint/eslint-plugin/v/8.60.0) - [`@typescript-eslint/parser@8.60.0`](https://npmjs.com/package/@typescript-eslint/parser/v/8.60.0) - [`axe-core@4.11.4`](https://npmjs.com/package/axe-core/v/4.11.4) - [`concurrently@10.0.0`](https://npmjs.com/package/concurrently/v/10.0.0) - [`dtsroll@1.8.2`](https://npmjs.com/package/dtsroll/v/1.8.2) - [`eslint-plugin-prettier@5.5.6`](https://npmjs.com/package/eslint-plugin-prettier/v/5.5.6) - [`keep-a-changelog@3.0.4`](https://npmjs.com/package/keep-a-changelog/v/3.0.4) - [`lint-staged@17.0.5`](https://npmjs.com/package/lint-staged/v/17.0.5) - [`nopt@10.0.0`](https://npmjs.com/package/nopt/v/10.0.0) - [`selenium-webdriver@4.44.0`](https://npmjs.com/package/selenium-webdriver/v/4.44.0) - [`webpack-cli@7.0.3`](https://npmjs.com/package/webpack-cli/v/7.0.3) - [`webpack@5.107.2`](https://npmjs.com/package/webpack/v/5.107.2) - [`yaml@2.9.0`](https://npmjs.com/package/yaml/v/2.9.0) ### Fixed - Fixed the "Retry" button to resend the message after it fails to send, instead of showing "Render error", by [@compulim](https://github.com/compulim) in PR [#5838](https://github.com/microsoft/BotFramework-WebChat/pull/5838) ## [4.19.0] - 2026-05-25 Breaking changes in this release: - ๐Ÿ’ฅ `styleOptions.bubbleImageHeight` is being deprecated in favor of `styleOptions.bubbleImageMaxHeight` and `styleOptions.bubbleImageMinHeight`. The option will be removed on or after 2026-07-05 - ๐Ÿ’ฅ `styleOptions.bubbleMaxWidth`/`bubbleMinWidth` is being deprecated in favor of `styleOptions.bubbleAttachmentMaxWidth`/`bubbleAttachmentMinWidth` and `styleOptions.bubbleMessageMaxWidth`/`bubbleMessageMinWidth`. The option will be removed on or after 2026-10-08 - ๐Ÿ’ฅ Moved to `micromark` for rendering Markdown, instead of `markdown-it` - Please refer to PR [#5330](https://github.com/microsoft/BotFramework-WebChat/pull/5330) for details - ๐Ÿ’ฅ HTML sanitizer is moved from `renderMarkdown` to HTML content transformer middleware, please refer to PR [#5338](https://github.com/microsoft/BotFramework-WebChat/pull/5338) - If you customized `renderMarkdown` with a custom HTML sanitizer, please move the HTML sanitizer to the new HTML content transformer middleware - ๐Ÿ’ฅ `useGroupActivities` hook is being deprecated in favor of the `useGroupActivitiesByName` hook. The hook will be removed on or after 2027-05-04 - ๐Ÿ’ฅ `useSuggestedActions()` hook is being deprecated in favor of the `useSuggestedActionsHooks().useSuggestedActions()` hook. The hook will be removed on or after 2027-05-30 - ๐Ÿ’ฅ The following middleware should be created using their respective factory function: - `activityBorderDecoratorMiddleware`, related to PR [#5504](https://github.com/microsoft/BotFramework-WebChat/pull/5504), [#5510](https://github.com/microsoft/BotFramework-WebChat/pull/5510) - `activityGroupingDecoratorMiddleware`, related to PR [#5504](https://github.com/microsoft/BotFramework-WebChat/pull/5504) - `sendBoxMiddleware`, related to PR [#5504](https://github.com/microsoft/BotFramework-WebChat/pull/5504) - `sendBoxToolbarMiddleware`, related to PR [#5504](https://github.com/microsoft/BotFramework-WebChat/pull/5504) - ๐Ÿ’ฅ `styleOptions.hideUploadButton` is being deprecated in favor of `styleOptions.disableFileUpload`. The option will be removed on or after 2027-07-14 - ๐Ÿ’ฅ `botframework-directlinespeech-sdk` no longer ponyfill `AbortController`, it is supported by modern browsers, in PR [#5530](https://github.com/microsoft/BotFramework-WebChat/pull/5530) - ๐Ÿ’ฅ `activityMiddleware` is being deprecated in favor of [`polymiddleware`](./docs/MIDDLEWARE.md). It will be removed on or after 2027-08-16, related to PR [#5515](https://github.com/microsoft/BotFramework-WebChat/pull/5515) - ๐Ÿ’ฅ Root-level (unconnected) `Claim` entity is being deprecated, in PR [#5564](https://github.com/microsoft/BotFramework-WebChat/pull/5564), by [@compulim](https://github.com/compulim). It will be removed on or after 2027-08-29 - Use `entities[@id=""][@type="Message"].citation[@type="Claim"]` instead - ๐Ÿ’ฅ `activityStatusMiddleware.nextVisibleActivity` and `activityStatusMiddleware.sameTimestampGroup` is removed after deprecation, in PR [#5565](https://github.com/microsoft/BotFramework-WebChat/issues/5565), by [@compulim](https://github.com/compulim) - ๐Ÿ’ฅ `avatarMiddleware` is being deprecated in favor of [`polymiddleware`](./docs/MIDDLEWARE.md). It will be removed on or after 2028-03-16, related to PR [#5779](https://github.com/microsoft/BotFramework-WebChat/pull/5779) ### Added - (Experimental) Added pre-chat message with starter prompts in Fluent UI, in PR [#5255](https://github.com/microsoft/BotFramework-WebChat/issues/5255) and [#5263](https://github.com/microsoft/BotFramework-WebChat/issues/5263), by [@compulim](https://github.com/compulim) - (Experimental) Added `isPrimary` props to Fluent UI send box. When set, will wire up with `useSendBoxValue` and works with starter prompts in pre-chat message, in PR [#5257](https://github.com/microsoft/BotFramework-WebChat/issues/5257), by [@compulim](https://github.com/compulim) - (Experimental) Expand Fluent theme support to activities and transcript, in PR [#5258](https://github.com/microsoft/BotFramework-WebChat/pull/5258), by [@OEvgeny](https://github.com/OEvgeny) - Added new Fluent UI theme variant "copilot" with updated styling and components, in PR [#5258](https://github.com/microsoft/BotFramework-WebChat/pull/5258), by [@OEvgeny](https://github.com/OEvgeny) - Introduced `ActivityDecorator` component for enhanced message styling and layout, in PR [#5258](https://github.com/microsoft/BotFramework-WebChat/pull/5258), by [@OEvgeny](https://github.com/OEvgeny) - Added `CopilotMessageHeader` component for displaying bot information in the "copilot" variant, in PR [#5258](https://github.com/microsoft/BotFramework-WebChat/pull/5258), by [@OEvgeny](https://github.com/OEvgeny) - Updated Fluent theme styling to improve accessibility and visual consistency, in PR [#5258](https://github.com/microsoft/BotFramework-WebChat/pull/5258), by [@OEvgeny](https://github.com/OEvgeny) - Fixed header font in copilot variant, in PR [#5261](https://github.com/microsoft/BotFramework-WebChat/pull/5261), by [@OEvgeny](https://github.com/OEvgeny) - Added "Copy" button to bot messages in Fluent UI if it contains keyword `AllowCopy`, in PR [#5259](https://github.com/microsoft/BotFramework-WebChat/pull/5259), [#5262](https://github.com/microsoft/BotFramework-WebChat/pull/5262), and [#5285](https://github.com/microsoft/BotFramework-WebChat/pull/5285), by [@compulim](https://github.com/compulim) - Resolves [#4876](https://github.com/microsoft/BotFramework-WebChat/issues/4876) and [#4939](https://github.com/microsoft/BotFramework-WebChat/issues/4939). Added support of informative message in livestreaming, by [@compulim](https://github.com/compulim), in PR [#5265](https://github.com/microsoft/BotFramework-WebChat/pull/5265) - Introduced centralized announcements approach via the new `usePushToLiveRegion` hook, in PR [#5251](https://github.com/microsoft/BotFramework-WebChat/pull/5251), by [@OEvgeny](https://github.com/OEvgeny) - Added keyboard shortcut for the "New Messages" button, in PR [#5251](https://github.com/microsoft/BotFramework-WebChat/pull/5251), by [@OEvgeny](https://github.com/OEvgeny) - Added decorators for loading and completion states to the Fluent theme, in PR [#5269](https://github.com/microsoft/BotFramework-WebChat/pull/5269), by [@OEvgeny](https://github.com/OEvgeny) - Added blueprint of starter prompts in the Fluent theme, in PR [#5270](https://github.com/microsoft/BotFramework-WebChat/pull/5270), [#5276](https://github.com/microsoft/BotFramework-WebChat/pull/5276), [#5279](https://github.com/microsoft/BotFramework-WebChat/pull/5279), and [#5284](https://github.com/microsoft/BotFramework-WebChat/pull/5284), by [@OEvgeny](https://github.com/OEvgeny) and [@compulim](https://github.com/compulim) - Added support for liner message activities in the Fluent theme, in PR [#5272](https://github.com/microsoft/BotFramework-WebChat/pull/5272), by [@OEvgeny](https://github.com/OEvgeny) - Added new `uiState` props and `useUIState` hook, in PR [#5276](https://github.com/microsoft/BotFramework-WebChat/pull/5276), by [@compulim](https://github.com/compulim) - (Experimental) Added support for using Web Chat inside a shadow DOM, in PR [#5196](https://github.com/microsoft/BotFramework-WebChat/pull/5196), by [@OEvgeny](https://github.com/OEvgeny) - Added `styleOptions.stylesRoot` property allowing users to specify the root node where Web Chat styles should be placed, in PR [#5196](https://github.com/microsoft/BotFramework-WebChat/pull/5196), by [@OEvgeny](https://github.com/OEvgeny) - Added the `ThemeProvider.styles` property, allowing theme packages to place styles into the same root node as Web Chat, in PR [#5196](https://github.com/microsoft/BotFramework-WebChat/pull/5196), by [@OEvgeny](https://github.com/OEvgeny) - Added `nonce` for Fluent and `react-scroll-to-bottom` injected styles, in PR [#5196](https://github.com/microsoft/BotFramework-WebChat/pull/5196), by [@OEvgeny](https://github.com/OEvgeny) - Updated `react-scroll-to-bottom` to version `4.2.1-main.53844f5`, in PR [#5196](https://github.com/microsoft/BotFramework-WebChat/pull/5196), by [@OEvgeny](https://github.com/OEvgeny) - Updated `react-film` to version `3.1.1-main.f623bf6`, in PR [#5196](https://github.com/microsoft/BotFramework-WebChat/pull/5196), by [@OEvgeny](https://github.com/OEvgeny) - (Experimental) Added CSS decorator support into Web Chat white-label experience, in PR [#5312](https://github.com/microsoft/BotFramework-WebChat/pull/5312), by [@OEvgeny](https://github.com/OEvgeny) - Introduced `WebChatDecorator` component for adding animated borders to activities, in PR [#5312](https://github.com/microsoft/BotFramework-WebChat/pull/5312) - Added new style options `borderAnimationColor1`, `borderAnimationColor2`, and `borderAnimationColor3` for customizing decorator colors, in PR [#5312](https://github.com/microsoft/BotFramework-WebChat/pull/5312) - Added `styleOptions.bubbleAttachmentMaxWidth`/`bubbleAttachmentMinWidth` and `styleOptions.bubbleMessageMaxWidth`/`bubbleMessageMinWidth`, in PR [#5321](https://github.com/microsoft/BotFramework-WebChat/pull/5321), by [@compulim](https://github.com/compulim) - (Experimental) Added more CSS variables support, in PR [#5321](https://github.com/microsoft/BotFramework-WebChat/pull/5321), by [@compulim](https://github.com/compulim) - Added MathML/TeX block support in Markdown via [`micromark-extension-math`](https://npmjs.com/package/micromark-extension-math) and [`katex`](https://katex.org/), in PR [#5332](https://github.com/microsoft/BotFramework-WebChat/pull/5332), by [@compulim](https://github.com/compulim) - Added code viewer dialog with syntax highlighting, in PR [#5335](https://github.com/microsoft/BotFramework-WebChat/pull/5335), by [@OEvgeny](https://github.com/OEvgeny) - Added copy button to code blocks, in PR [#5334](https://github.com/microsoft/BotFramework-WebChat/pull/5334), by [@compulim](https://github.com/compulim) - Added copy button to view code dialog, in PR [#5336](https://github.com/microsoft/BotFramework-WebChat/pull/5336), by [@compulim](https://github.com/compulim) - Added HTML content transformer middleware, in PR [#5338](https://github.com/microsoft/BotFramework-WebChat/pull/5338) and [#5347](https://github.com/microsoft/BotFramework-WebChat/pull/5347), by [@compulim](https://github.com/compulim) - HTML content transformer is used by `useRenderMarkdown` to transform the result from `renderMarkdown` - HTML sanitizer is moved from `renderMarkdown` into HTML content transformer for better coverage - Copy button is added to fenced code blocks (`
`)
   - Configure HTML sanitizer via `request.allowedTags`
- Added support for math blocks using `$$` delimiter alongside existing `\[...\]` and `\(...\)` notations, in PR [#5381](https://github.com/microsoft/BotFramework-WebChat/pull/5381), by [@OEvgeny](https://github.com/OEvgeny)
- Added support for speech recognition initial silence timeout when using Azure Speech, in PR [#5400](https://github.com/microsoft/BotFramework/WebChat/pull/5400), by [@compulim](https://github.com/compulim)
- Introduced syntax highlighting for markdown code blocks, in PR [#5389](https://github.com/microsoft/BotFramework-WebChat/pull/5389), by [@OEvgeny](https://github.com/OEvgeny)
- (Experimental) Added `feedbackActionsPlacement` style option to control feedback button placement, in PR [#5407](https://github.com/microsoft/BotFramework-WebChat/pull/5407), by [@OEvgeny](https://github.com/OEvgeny)
   - New style option supports two values: `'activity-actions'` and `'activity-status'` (default)
   - When set to `'activity-actions'`, feedback buttons are displayed in the activity actions toolbar
   - When set to `'activity-status'`, feedback buttons appear in the activity status area (default behavior)
- Added support for including activity ID and key into form data indicated by `data-webchat-include-activity-id` and `data-webchat-include-activity-key` attributes, in PR [#5418](https://github.com/microsoft/BotFramework-WebChat/pull/5418), by [@OEvgeny](https://github.com/OEvgeny)
- Added dedicated loading animation for messages in preparing state for Fluent theme, in PR [#5423](https://github.com/microsoft/BotFramework-WebChat/pull/5423), by [@OEvgeny](https://github.com/OEvgeny)
- Resolved [#2661](https://github.com/microsoft/BotFramework-WebChat/issues/2661) and [#5352](https://github.com/microsoft/BotFramework-WebChat/issues/5352). Added speech recognition continuous mode with barge-in support, in PR [#5426](https://github.com/microsoft/BotFramework-WebChat/pull/5426), by [@RushikeshGavali](https://github.com/RushikeshGavali) and [@compulim](https://github.com/compulim)
   - Set `styleOptions.speechRecognitionContinuous` to `true` with a Web Speech API provider with continuous mode support
- Added support of [contentless activity in livestream](https://github.com/microsoft/BotFramework-WebChat/blob/main/docs/LIVESTREAMING.md#scenario-3-interim-activities-with-no-content), in PR [#5430](https://github.com/microsoft/BotFramework-WebChat/pull/5430), by [@compulim](https://github.com/compulim)
- Added sliding dots typing indicator in Fluent theme, in PR [#5447](https://github.com/microsoft/BotFramework-WebChat/pull/5447) and PR [#5448](https://github.com/microsoft/BotFramework-WebChat/pull/5448), by [@compulim](https://github.com/compulim)
- (Experimental) Add an ability to pass `completion` prop into Fluent send box and expose the component, in PR [#5466](https://github.com/microsoft/BotFramework-WebChat/pull/5466), by [@OEvgeny](https://github.com/OEvgeny)
- Added feedback form for like/dislike button when `feedbackActionsPlacement` is `"activity-actions"`, in PR [#5460](https://github.com/microsoft/BotFramework-WebChat/pull/5460), PR [#5469](https://github.com/microsoft/BotFramework-WebChat/pull/5469), PR [5470](https://github.com/microsoft/BotFramework-WebChat/pull/5470), PR [#5501](https://github.com/microsoft/BotFramework-WebChat/pull/5501) by [@lexi-taylor](https://github.com/lexi-taylor), and [@OEvgeny](https://github.com/OEvgeny)
   - ESCAPE key should reset the feedback form, in PR [#5480](https://github.com/microsoft/BotFramework-WebChat/pull/5480), by [@compulim](https://github.com/compulim), in PR [#5493](https://github.com/microsoft/BotFramework-WebChat/pull/5493) by [@lexi-taylor](https://github.com/lexi-taylor)
- Added multi-dimensional grouping, `styleOptions.groupActivitiesBy`, and `useGroupActivitiesByName` hook, in PR [#5471](https://github.com/microsoft/BotFramework-WebChat/pull/5471), by [@compulim](https://github.com/compulim)
   - Existing behavior will be kept and activities will be grouped by `sender` followed by `status`
   - `useGroupActivitiesByName` is favored over the existing `useGroupActivities` hook for performance reason
   - Middleware which support the new grouping name init argument should only compute the grouping if they match the grouping name, or the grouping name is not specified, otherwise, should do nothing and call the downstream middleware
- Resolved [#5463](https://github.com/microsoft/BotFramework-WebChat/issues/5463). Added attachment preview for `sendAttachmentOn: "send"`, in PR [#5464](https://github.com/microsoft/BotFramework-WebChat/pull/5464), by [@compulim](https://github.com/compulim), in PR [#5492](https://github.com/microsoft/BotFramework-WebChat/pull/5492), by [@OEvgeny](https://github.com/OEvgeny)
   - Attaching files will no longer remove previously attached files
   - Updated Fluent theme to use the new attachment preview feature
- Added collapsible activity and activity with abstract handling, in PR [#5506](https://github.com/microsoft/BotFramework-WebChat/pull/5506), in PR [#5513](https://github.com/microsoft/BotFramework-WebChat/pull/5513), in PR [#5771](https://github.com/microsoft/BotFramework-WebChat/pull/5771), by [@OEvgeny](https://github.com/OEvgeny)
   - Added `styleOptions.partGroupDefaultOpen` to configure whether part groups are open by default, defaults to `true`
   - Added `styleOptions.referenceListDefaultOpen` to configure whether references are open by default, defaults to `true`
   - In the Fluent theme "copilot" variant, part groups and references now default to closed
- Added `disableFileUpload` flag to completelly disable file upload feature, in PR [#5508](https://github.com/microsoft/BotFramework-WebChat/pull/5508), by [@JamesNewbyAtMicrosoft](https://github.com/JamesNewbyAtMicrosoft)
   - Deprecated `hideUploadButton` in favor of `disableFileUpload`.
   - Updated `BasicSendBoxToolbar` to rely solely on `disableFileUpload`.
- Added support for livestreaming via `entities[type="streaminfo"]` in PR [#5517](https://github.com/microsoft/BotFramework-WebChat/pull/5517) by [@kylerohn](https://github.com/kylerohn) and [@compulim](https://github.com/compulim)
- Added `polymiddleware`, a new [universal middleware for every UIs](./docs/MIDDLEWARE.md), by [@compulim](https://github.com/compulim) in PR [#5515](https://github.com/microsoft/BotFramework-WebChat/pull/5515) and [#5566](https://github.com/microsoft/BotFramework-WebChat/pull/5566)
   - Legacy middleware is prioritized over polymiddleware
   - Added `polymiddleware` to ``
   - Currently supports activity middleware and the new error box middleware
   - Supports avatar middleware, by [@compulim](https://github.com/compulim) in PR [#5779](https://github.com/microsoft/BotFramework-WebChat/pull/5779)
- New internal packages, by [@compulim](https://github.com/compulim) in PR [#5515](https://github.com/microsoft/BotFramework-WebChat/pull/5515)
   - `@msinternal/botframework-webchat-api-middleware` for middleware branch of API package
   - `@msinternal/botframework-webchat-debug-theme` package for enabling debugging scenarios
   - `@msinternal/botframework-webchat-react-hooks` for helpers for React hooks
- Added link sanitization and ESLint rules, in PR [#5564](https://github.com/microsoft/BotFramework-WebChat/pull/5564), by [@compulim](https://github.com/compulim)
- Added blob URL sanitization and ESLint rules, in PR [#5568](https://github.com/microsoft/BotFramework-WebChat/pull/5568), by [@compulim](https://github.com/compulim)
- Added visual message grouping following the `isPartOf` property of the `Message` entity, in PR [#5553](https://github.com/microsoft/BotFramework-WebChat/pull/5553), in PR [#5585](https://github.com/microsoft/BotFramework-WebChat/pull/5585), in PR [#5590](https://github.com/microsoft/BotFramework-WebChat/pull/5590), in PR [#5608](https://github.com/microsoft/BotFramework-WebChat/pull/5608), in PR [#5773](https://github.com/microsoft/BotFramework-WebChat/pull/5773), by [@OEvgeny](https://github.com/OEvgeny)
   - The mode is suitable for providing chain-of-thought reasoning
   - Added visual indication of `creativeWorkStatus` property in `Message` entity:
      - `undefined` - no indicator is shown
      - `'Incomplete'` - show loader aside from the message
      - `'Published'` - show checkmark aside from the message
   - Added a `position` property support for the `Message` entity
      - The `position` property takes precedence over existing sequence ID
   - Added support for explicit group status via `isPartOf.creativeWorkStatus` and `isPartOf.abstract` on the HowTo entity
      - When the HowTo entity carries an explicit `creativeWorkStatus`, it takes precedence over status derived from individual messages
      - When the HowTo entity carries an `abstract`, it is used as the group header title
- Unified build info and injection of `` tag, in PR [#5571](https://github.com/microsoft/BotFramework-WebChat/pull/5571), by [@compulim](https://github.com/compulim)
- Added documentation for `isPartOf` property, in PR [#5573](https://github.com/microsoft/BotFramework-WebChat/pull/5573), by [@compulim](https://github.com/compulim)
- `fluent-theme`: Changed dependencies to import solely from the "bundle" package, in PR [#5584](https://github.com/microsoft/BotFramework-WebChat/pull/5584), by [@compulim](https://github.com/compulim)
- Improved bundling, in PR [#5588](https://github.com/microsoft/BotFramework-WebChat/pull/5588), by [@compulim](https://github.com/compulim)
   - New named exports
      - `api`: `botframework-webchat-api/hook`
      - `bundle`: `botframework-webchat/component`, `botframework-webchat/decorator` (internal-use), `botframework-webchat/hook`
      - `component`: `botframework-webchat-component/component`, `botframework-webchat-component/hook`
- (Experimental) Added support for importing via `