WinAppSDK 1.8Exp3 Release Notes (MicrosoftDocs#5511)

Author: RDMacLachlan

hub/apps/windows-app-sdk/downloads.md

@@ -41,6 +41,7 @@ For all the latest Windows App SDK downloads, refer to the tables and links belo
 
 | Version                                                                                                                                                                                                                                                                                                                                                                                                | Runtime downloads                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
 | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| [1.8 Experimental3 (1.8.250610002-experimental3) ](/windows/apps/windows-app-sdk/experimental-channel#version-18-experimental-180-experimental3) <br/> 06/12/2025 <br/> [Release notes](/windows/apps/windows-app-sdk/experimental-channel#version-18-experimental-180-experimental3) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.8-experimental3) | [Installer (x64)](https://aka.ms/windowsappsdk/1.8/1.8.250610002-experimental3/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.8/1.8.250610002-experimental3/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.8/1.8.250610002-experimental3/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.8/1.8.250610002-experimental3/Microsoft.WindowsAppRuntime.Redist.1.8.zip) |
 | [1.8 Experimental2 (1.8.250515001-experimental2) ](/windows/apps/windows-app-sdk/experimental-channel#version-18-experimental-180-experimental2) <br/> 05/19/2025 <br/> [Release notes](/windows/apps/windows-app-sdk/experimental-channel#version-18-experimental-180-experimental2) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.8-experimental2) | [Installer (x64)](https://aka.ms/windowsappsdk/1.8/1.8.250515001-experimental2/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.8/1.8.250515001-experimental2/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.8/1.8.250515001-experimental2/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.8/1.8.250515001-experimental2/Microsoft.WindowsAppRuntime.Redist.1.8.zip) |
 | [1.8 Experimental1 (1.8.250410001-experimental1) ](/windows/apps/windows-app-sdk/experimental-channel#version-18-experimental-180-experimental1) <br/> 04/15/2025 <br/> [Release notes](/windows/apps/windows-app-sdk/experimental-channel#version-18-experimental-180-experimental1) <br/> [Source](https://github.com/microsoft/microsoft-ui-xaml/releases/tag/winui3%2Frelease%2F1.8-experimental1) | [Installer (x64)](https://aka.ms/windowsappsdk/1.8/1.8.250410001-experimental1/windowsappruntimeinstall-x64.exe) <br/> [Installer (x86)](https://aka.ms/windowsappsdk/1.8/1.8.250410001-experimental1/windowsappruntimeinstall-x86.exe) <br/> [Installer (arm64)](https://aka.ms/windowsappsdk/1.8/1.8.250410001-experimental1/windowsappruntimeinstall-arm64.exe) <br/> [Redistributable](https://aka.ms/windowsappsdk/1.8/1.8.250410001-experimental1/Microsoft.WindowsAppRuntime.Redist.1.8.zip) |
 

hub/apps/windows-app-sdk/experimental-channel.md

@@ -30,6 +30,362 @@ The experimental channel includes releases of the Windows App SDK with [experime
 - [Experimental channel release notes for the Windows App SDK 1.0](release-notes-archive/experimental-channel-1.0.md)
 - [Experimental channel release notes for the Windows App SDK 0.8](release-notes-archive/experimental-channel-0.8.md)
 
+## Version 1.8 Experimental (1.8.0-experimental3)
+
+### Use on-device AI with Windows AI APIs
+
+> [!IMPORTANT]
+> The underlying ML models required for these APIs currently require your device to be running the latest Windows 11 Insider Preview Build on the Dev Channel. Additionally, these APIs require your device to be a Copilot+ PC. See [Copilot+ PCs Developer Guide](/windows/ai/npu-devices) to learn more about these devices. APIs will throw an exception when called on devices lacking the necessary support.
+
+The Windows App SDK incorporates advanced Windows AI capabilities, enabling developers to seamlessly integrate intelligent features into their applications. These enhancements include local AI functionalities such as responding to incoming prompts, recognizing text within images, describing image contents, extract objects from pictures, and more.
+
+For information on responsible development practices utilized during the creation of the Windows AI APIs, which can also be applied when creating AI-assisted features, consult the [Developing Responsible Generative AI Applications and Features on Windows](/windows/ai/rai) guidance.
+
+### New APIs for 1.8-experimental3
+
+This release includes the following new and modified experimental APIs:
+
+```
+Microsoft.UI.Composition
+
+    CompositionNotificationDeferral
+    CompositionProjectedShadow
+        MaxOpacity
+        MinOpacity
+        OpacityFalloff
+
+    CompositionProjectedShadowCaster
+        AncestorClip
+        Mask
+
+    CompositionProjectedShadowDrawOrder
+    CompositionProjectedShadowReceiver
+        DrawOrder
+        Mask
+```
+```
+Microsoft.UI.Composition.Experimental
+
+    ExpCompositionVisualSurface
+    ExpExpressionNotificationProperty
+    IExpCompositionPropertyChanged
+    IExpCompositionPropertyChangedListener
+    IExpCompositor
+    IExpVisual
+```
+```
+Microsoft.UI.Content
+
+    ContentAppWindowBridge
+    ContentDisplayOrientations
+    ContentExternalBackdropLink
+    ContentExternalOutputLink
+    ContentIsland
+        Connected
+        ConnectionInfo
+        ConnectRemoteEndpoint
+        Disconnected
+        IsRemoteEndpointConnected
+        Root
+
+    ContentIslandEnvironment
+        CurrentOrientation
+        NativeOrientation
+        ThemeChanged
+
+    ContentSite
+        TryGetAutomationProvider
+
+    ContentSiteEnvironment
+        CurrentOrientation
+        NativeOrientation
+        NotifyThemeChanged
+
+    CoreWindowSiteBridge
+    CoreWindowTopLevelWindowBridge
+    DesktopChildSiteBridge
+        AcceptRemoteEndpoint
+        ConnectionInfo
+        IsRemoteEndpointConnected
+        RemoteEndpointConnecting
+        RemoteEndpointDisconnected
+        RemoteEndpointRequestedStateChanged
+
+    DesktopSiteBridge
+        TryCreatePopupSiteBridge
+
+    EndpointConnectionEventArgs
+    EndpointRequestedStateChangedEventArgs
+    IContentIslandEndpointConnectionPrivate
+    IContentNodeOwner
+    IContentSiteBridgeEndpointConnectionPrivate
+    PopupWindowSiteBridge
+    ProcessStarter
+    SystemVisualSiteBridge
+```
+```
+Microsoft.UI.Designer
+
+    DesignerOutputHost
+```
+```
+Microsoft.UI.Input
+
+    InputKeyboardSource
+        GetForWindowId
+
+    InputLayoutPolicy
+    InputLightDismissAction
+        GetForIsland
+
+    InputLightDismissEventArgs
+    InputPointerActivationBehavior
+    InputPointerSource
+        ActivationBehavior
+        DirectManipulationHitTest
+        GetForVisual
+        GetForWindowId
+        RemoveForVisual
+        TouchHitTesting
+        TrySetDeviceKinds
+
+    InputPopupController
+    LightDismissReason
+    PopupPointerMode
+    ProximityEvaluation
+    TouchHitTestingEventArgs
+```
+```
+Microsoft.UI.Input.Experimental
+
+    ExpInputSite
+    ExpPointerPoint
+```
+```
+Microsoft.UI.Windowing
+
+    AppWindow
+        GetCurrentPlacement
+        PersistedStateId
+        PlacementRestorationBehavior
+        SaveCurrentPlacement
+        SaveCurrentPlacementForAllPersistedStateIds
+        SetCurrentPlacement
+
+    AppWindowPlacementDetails
+    DisplayArea
+        GetMetricsFromWindowId
+
+    PlacementInfo
+    PlacementRestorationBehavior
+```
+```
+Microsoft.UI.Xaml
+
+    XamlIsland
+        ShouldConstrainPopupsToWorkArea
+```
+```
+Microsoft.UI.Xaml.Automation.Peers
+
+    AutomationEvents
+        Notification
+
+    InkCanvasAutomationPeer
+    PagerControlAutomationPeer
+
+Microsoft.UI.Xaml.Controls
+
+    ContentDialogPlacement
+        UnconstrainedPopup
+
+    DoInkPresenterWork
+    ElementFactory
+    FlowLayout
+    FlowLayoutAnchorInfo
+    FlowLayoutLineAlignment
+    FlowLayoutState
+    IApplicationViewSpanningRects
+    IndexPath
+    InfoBar
+        Opened
+
+    InfoBarOpenedEventArgs
+    InkCanvas
+    ISelfPlayingAnimatedVisual
+    ItemContainer
+        CanUserInvoke
+        CanUserInvokeProperty
+        CanUserSelect
+        CanUserSelectProperty
+        ItemInvoked
+        MultiSelectMode
+        MultiSelectModeProperty
+
+    ItemContainerInteractionTrigger
+    ItemContainerInvokedEventArgs
+    ItemContainerMultiSelectMode
+    ItemContainerUserInvokeMode
+    ItemContainerUserSelectMode
+    LayoutPanel
+    NumberBox
+        InputScope
+        InputScopeProperty
+        TextAlignment
+        TextAlignmentProperty
+
+    PagerControl
+    PagerControlButtonVisibility
+    PagerControlDisplayMode
+    PagerControlSelectedIndexChangedEventArgs
+    PagerControlTemplateSettings
+    ProgressRing
+        DeterminateSource
+        DeterminateSourceProperty
+        IndeterminateSource
+        IndeterminateSourceProperty
+
+    RecyclePool
+    RecyclingElementFactory
+    ScrollingScrollStartingEventArgs
+    ScrollingZoomStartingEventArgs
+    ScrollView
+        ScrollStarting
+        ZoomStarting
+
+    SelectionModel
+    SelectionModelChildrenRequestedEventArgs
+    SelectionModelSelectionChangedEventArgs
+    SelectTemplateEventArgs
+    StackLayout
+        IsVirtualizationEnabled
+        IsVirtualizationEnabledProperty
+
+    StackLayoutState
+    TeachingTip
+        Opened
+
+    TeachingTipOpenedEventArgs
+    UniformGridLayoutState
+```
+```
+Microsoft.UI.Xaml.Controls.Primitives
+
+    ScrollPresenter
+        ScrollStarting
+        ZoomStarting
+```
+```
+Microsoft.Windows.AI.Foundation
+
+    AIFoundationContract
+    EmbeddingVector
+```
+```
+Microsoft.Windows.AI.Imaging
+
+    ImageObjectRemover
+    ImageObjectRemoverContract
+```
+```
+Microsoft.Windows.AI.Text
+
+    ConversationItem
+    ConversationSummaryOptions
+    InputKind
+    LanguageModel
+        CreateContext
+        CreateContext
+        CreateContext
+        GenerateEmbeddingVectors
+        GenerateEmbeddingVectors
+        GenerateResponseAsync
+        GenerateResponseAsync
+        GenerateResponseAsync
+        GenerateResponseFromEmbeddingsAsync
+        GenerateResponseFromEmbeddingsAsync
+        GenerateResponseFromEmbeddingsAsync
+        GetUsablePromptLength
+        GetUsablePromptLength
+        GetVectorSpaceId
+
+    LanguageModelEmbeddingVectorResult
+    TextSummarizer
+        SummarizeConversationAsync
+```
+```
+Microsoft.Windows.ApplicationModel.Background.UniversalBGTask
+
+    Task
+        Run
+```
+```
+Microsoft.Windows.ApplicationModel.WindowsAppRuntime
+
+    DeploymentManager
+        Repair
+
+    DeploymentStatus
+        PackageRepairFailed
+```
+```
+Microsoft.Windows.AppNotifications
+
+    AppNotification
+        ConferencingConfig
+
+    AppNotificationConferencingConfig
+```
+```
+Microsoft.Windows.AppNotifications.Builder
+
+    AppNotificationBuilder
+        AddCameraPreview
+
+    AppNotificationButton
+        SetSettingStyle
+
+    AppNotificationButtonSettingStyle
+```
+```
+Microsoft.Windows.SemanticSearch
+
+    EmbeddingVector
+    SemanticSearchContract
+```
+```
+Microsoft.Windows.Storage
+
+    ApplicationData
+        GetForUnpackaged
+```
+```
+Microsoft.Windows.Storage.Pickers
+
+    FileOpenPicker
+    FileSavePicker
+    FolderPicker
+    PickerLocationId
+    PickerViewMode
+    PickFileResult
+    PickFolderResult
+```
+```
+Microsoft.Windows.Vision
+
+    ScreenRegionBoundingBox
+    ScreenRegionDetectionContract
+    ScreenRegionLabel
+```
+```
+Microsoft.Windows.Widgets.Feeds.Providers
+
+    FeedManager
+        TryRemoveAnnouncementById
+
+    IFeedManager3
+```
+
 ## Version 1.8 Experimental (1.8.0-experimental2)
 
 ### Use on-device AI with Windows AI APIs

hub/apps/windows-app-sdk/release-channels.md

@@ -18,7 +18,7 @@ The latest version of the Windows App SDK ships via three release channels: Expe
 | --------- | ------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------- | ---------- | ----------------------------------------------------------------------------------------------------- |
 | **✅**    | Stable ([release notes](stable-channel.md))             | This channel is supported for use by apps in production environments. It includes only stable APIs.                                                                        | No more frequent than every six months<br>(+ servicing)                            | Yes        | [1.7.3 (1.7.250606001)](stable-channel.md#version-173-17250606001) (06/10/2025)                       |
 | **❇️**  | Preview ([release notes](preview-channel.md))           | This channel provides a preview of the next stable release. There may be breaking API changes between a given preview channel release and the next stable release.         | At least one preview per stable version                                            | No         | [1.7.0-preview1](preview-channel.md#version-17-preview-1-17-preview1) (02/11/2025)                    |
-| **🔄️** | Experimental ([release notes](experimental-channel.md)) | This channel includes experimental features that are in early stages of development. Experimental features may be removed from the next release, or may never be released. | As needed when requiring feedback for features in early design or prototype stages | No         | [1.8.0-experimental2](experimental-channel.md#version-18-experimental-180-experimental2) (05/19/2025) |
+| **🔄️** | Experimental ([release notes](experimental-channel.md)) | This channel includes experimental features that are in early stages of development. Experimental features may be removed from the next release, or may never be released. | As needed when requiring feedback for features in early design or prototype stages | No         | [1.8.0-experimental3](experimental-channel.md#version-18-experimental-180-experimental3) (06/12/2025) |
 
 For a comprehensive list of all current and previous releases of the Windows App SDK, including download locations, see [Downloads for the Windows App SDK](downloads.md).