Windows 10 SDK Preview Build 18999 available now! – Windows Developer Blog

Today, we released a new Windows 10 Preview Build of the SDK to be used in conjunction with Windows 10 Insider Preview (Build 18999 or greater). The Preview SDK Build 18999 contains bug fixes and under development changes to the API surface area.The Preview SDK can be downloaded from developer section on Windows Insider.
For feedback and updates to the known issues, please see the developer forum. For new developer feature requests, head over to our Windows Platform UserVoice.

This build works in conjunction with previously released SDKs and Visual Studio 2017 and 2019. You can install this SDK and still also continue to submit your apps that target Windows 10 build 1903 or earlier to the Microsoft Store.
The Windows SDK will now formally only be supported by Visual Studio 2017 and greater. You can download the Visual Studio 2019 here.
This build of the Windows SDK will install on only on Windows 10 Insider Preview builds.
In order to assist with script access to the SDK, the ISO will also be able to be accessed through the following static URL:

Message Compiler (mc.exe)
Now detects the Unicode byte order mark (BOM) in .mc files. If the If the .mc file starts with a UTF-8 BOM, it will be read as a UTF-8 file. Otherwise, if it starts with a UTF-16LE BOM, it will be read as a UTF-16LE file. If the -u parameter was specified, it will be read as a UTF-16LE file. Otherwise, it will be read using the current code page (CP_ACP).
Now avoids one-definition-rule (ODR) problems in MC-generated C/C++ ETW helpers caused by conflicting configuration macros (e.g. when two .cpp files with conflicting definitions of MCGEN_EVENTWRITETRANSFER are linked into the same binary, the MC-generated ETW helpers will now respect the definition of MCGEN_EVENTWRITETRANSFER in each .cpp file instead of arbitrarily picking one or the other).
Windows Trace Preprocessor (tracewpp.exe)
Now supports Unicode input (.ini, .tpl, and source code) files. Input files starting with a UTF-8 or UTF-16 byte order mark (BOM) will be read as Unicode. Input files that do not start with a BOM will be read using the current code page (CP_ACP). For backwards-compatibility, if the -UnicodeIgnore command-line parameter is specified, files starting with a UTF-16 BOM will be treated as empty.
Now supports Unicode output (.tmh) files. By default, output files will be encoded using the current code page (CP_ACP). Use command-line parameters -cp:UTF-8 or -cp:UTF-16 to generate Unicode output files.
Behavior change: tracewpp now converts all input text to Unicode, performs processing in Unicode, and converts output text to the specified output encoding. Earlier versions of tracewpp avoided Unicode conversions and performed text processing assuming a single-byte character set. This may lead to behavior changes in cases where the input files do not conform to the current code page. In cases where this is a problem, consider converting the input files to UTF-8 (with BOM) and/or using the -cp:UTF-8 command-line parameter to avoid encoding ambiguity.
Now avoids one-definition-rule (ODR) problems caused by conflicting configuration macros (e.g. when two .cpp files with conflicting definitions of TLG_EVENT_WRITE_TRANSFER are linked into the same binary, the TraceLoggingProvider.h helpers will now respect the definition of TLG_EVENT_WRITE_TRANSFER in each .cpp file instead of arbitrarily picking one or the other).
In C++ code, the TraceLoggingWrite macro has been updated to enable better code sharing between similar events using variadic templates.
Signing your apps with Device Guard Signing
We are making it easier for you to sign your app. Device Guard signing is a Device Guard feature that is available in Microsoft Store for Business and Education. Signing allows enterprises to guarantee every app comes from a trusted source. Our goal is to make signing your MSIX package easier. Documentation on Device Guard Signing can be found here:
Windows SDK Flight NuGet Feed
We have stood up a NuGet feed for the flighted builds of the SDK. You can now test preliminary builds of the Windows 10 WinRT API Pack, as well as a NuGet package.
There are 2 NuGets that can be consumed:
Microsoft.Windows.SDK.Contracts which can be used with to add the latest Windows Runtime APIs support to your .NET Framework 4.5+ and .NET Core 3.0+ libraries and apps.
The Windows 10 WinRT API Pack enables you to add the latest Windows Runtime APIs support to your .NET Framework 4.5+ and .NET Core 3.0+ libraries and apps.
Microsoft.Windows.SDK.Headless.Contracts provides a set of Windows Runtime APIs for console apps which exclude the APIs associated with a graphical user interface. This NuGet is used in conjunction with
Windows ML container development. Check out the Getting Started guide for more information.

Removal of api-ms-win-net-isolation-l1-1-0.lib
In this release api-ms-win-net-isolation-l1-1-0.lib has been removed from the Windows SDK. Apps that were linking against api-ms-win-net-isolation-l1-1-0.lib can switch to OneCoreUAP.lib as a replacement.
Removal of IRPROPS.LIB
In this release irprops.lib has been removed from the Windows SDK. Apps that were linking against irprops.lib can switch to bthprops.lib as a drop-in replacement.
Removal of WUAPICommon.H and WUAPICommon.IDL
In this release we have moved ENUM tagServerSelection from WUAPICommon.H to wupai.h and removed the header. If you would like to use the ENUM tagServerSelection, you will need to include wuapi.h or wuapi.idl.

The following APIs have been added to the platform since the release of Windows 10 SDK, version 1903, build 18362.

namespace Windows.AI.MachineLearning {
public sealed class LearningModelSessionOptions {
bool CloseModelOnSessionCreation { get; set; }
namespace Windows.ApplicationModel {
public sealed class AppInfo {
public static AppInfo Current { get; }
Package Package { get; }
public static AppInfo GetFromAppUserModelId(string appUserModelId);
public static AppInfo GetFromAppUserModelIdForUser(User user, string appUserModelId);
public interface IAppInfoStatics
public sealed class Package {
StorageFolder EffectiveExternalLocation { get; }
string EffectiveExternalPath { get; }
string EffectivePath { get; }
string InstalledPath { get; }
bool IsStub { get; }
StorageFolder MachineExternalLocation { get; }
string MachineExternalPath { get; }
string MutablePath { get; }
StorageFolder UserExternalLocation { get; }
string UserExternalPath { get; }
IVectorView GetAppListEntries();
RandomAccessStreamReference GetLogoAsRandomAccessStreamReference(Size size);
namespace Windows.ApplicationModel.AppService {
public enum AppServiceConnectionStatus {
AuthenticationError = 8,
DisabledByPolicy = 10,
NetworkNotAvailable = 9,
WebServiceUnavailable = 11,
public enum AppServiceResponseStatus {
AppUnavailable = 6,
AuthenticationError = 7,
DisabledByPolicy = 9,
NetworkNotAvailable = 8,
WebServiceUnavailable = 10,
public enum StatelessAppServiceResponseStatus {
AuthenticationError = 11,
DisabledByPolicy = 13,
NetworkNotAvailable = 12,
WebServiceUnavailable = 14,
namespace Windows.ApplicationModel.Background {
public sealed class BackgroundTaskBuilder {
void SetTaskEntryPointClsid(Guid TaskEntryPoint);
public sealed class BluetoothLEAdvertisementPublisherTrigger : IBackgroundTrigger {
bool IncludeTransmitPowerLevel { get; set; }
bool IsAnonymous { get; set; }
IReference PreferredTransmitPowerLevelInDBm { get; set; }
bool UseExtendedFormat { get; set; }
public sealed class BluetoothLEAdvertisementWatcherTrigger : IBackgroundTrigger {
bool AllowExtendedAdvertisements { get; set; }
namespace Windows.ApplicationModel.ConversationalAgent {
public sealed class ActivationSignalDetectionConfiguration
public enum ActivationSignalDetectionTrainingDataFormat
public sealed class ActivationSignalDetector
public enum ActivationSignalDetectorKind
public enum ActivationSignalDetectorPowerState
public sealed class ConversationalAgentDetectorManager
public sealed class DetectionConfigurationAvailabilityChangedEventArgs
public enum DetectionConfigurationAvailabilityChangeKind
public sealed class DetectionConfigurationAvailabilityInfo
public enum DetectionConfigurationTrainingStatus
namespace Windows.ApplicationModel.DataTransfer {
public sealed class DataPackage {
event TypedEventHandler ShareCanceled;
namespace Windows.Devices.Bluetooth {
public sealed class BluetoothAdapter {
bool IsExtendedAdvertisingSupported { get; }
uint MaxAdvertisementDataLength { get; }
namespace Windows.Devices.Bluetooth.Advertisement {
public sealed class BluetoothLEAdvertisementPublisher {
bool IncludeTransmitPowerLevel { get; set; }
bool IsAnonymous { get; set; }
IReference PreferredTransmitPowerLevelInDBm { get; set; }
bool UseExtendedAdvertisement { get; set; }
public sealed class BluetoothLEAdvertisementPublisherStatusChangedEventArgs {
IReference SelectedTransmitPowerLevelInDBm { get; }
public sealed class BluetoothLEAdvertisementReceivedEventArgs {
BluetoothAddressType BluetoothAddressType { get; }
bool IsAnonymous { get; }
bool IsConnectable { get; }
bool IsDirected { get; }
bool IsScannable { get; }
bool IsScanResponse { get; }
IReference TransmitPowerLevelInDBm { get; }
public enum BluetoothLEAdvertisementType {
Extended = 5,
public sealed class BluetoothLEAdvertisementWatcher {
bool AllowExtendedAdvertisements { get; set; }
public enum BluetoothLEScanningMode {
None = 2,
namespace Windows.Devices.Bluetooth.Background {
public sealed class BluetoothLEAdvertisementPublisherTriggerDetails {
IReference SelectedTransmitPowerLevelInDBm { get; }
namespace Windows.Devices.Display {
public sealed class DisplayMonitor {
bool IsDolbyVisionSupportedInHdrMode { get; }
namespace Windows.Devices.Input {
public sealed class PenButtonListener
public sealed class PenDockedEventArgs
public sealed class PenDockListener
public sealed class PenTailButtonClickedEventArgs
public sealed class PenTailButtonDoubleClickedEventArgs
public sealed class PenTailButtonLongPressedEventArgs
public sealed class PenUndockedEventArgs
namespace Windows.Devices.Sensors {
public sealed class Accelerometer {
AccelerometerDataThreshold ReportThreshold { get; }
public sealed class AccelerometerDataThreshold
public sealed class Barometer {
BarometerDataThreshold ReportThreshold { get; }
public sealed class BarometerDataThreshold
public sealed class Compass {
CompassDataThreshold ReportThreshold { get; }
public sealed class CompassDataThreshold
public sealed class Gyrometer {
GyrometerDataThreshold ReportThreshold { get; }
public sealed class GyrometerDataThreshold
public sealed class Inclinometer {
InclinometerDataThreshold ReportThreshold { get; }
public sealed class InclinometerDataThreshold
public sealed class LightSensor {
LightSensorDataThreshold ReportThreshold { get; }
public sealed class LightSensorDataThreshold
public sealed class Magnetometer {
MagnetometerDataThreshold ReportThreshold { get; }
public sealed class MagnetometerDataThreshold
namespace Windows.Foundation.Metadata {
public sealed class AttributeNameAttribute : Attribute
public sealed class FastAbiAttribute : Attribute
public sealed class NoExceptionAttribute : Attribute
namespace Windows.Globalization {
public sealed class Language {
string AbbreviatedName { get; }
public static IVector GetMuiCompatibleLanguageListFromLanguageTags(IIterable languageTags);
namespace Windows.Graphics.Capture {
public sealed class GraphicsCaptureSession : IClosable {
bool IsCursorCaptureEnabled { get; set; }
namespace Windows.Graphics.DirectX {
public enum DirectXPixelFormat {
SamplerFeedbackMinMipOpaque = 189,
SamplerFeedbackMipRegionUsedOpaque = 190,
namespace Windows.Graphics.Holographic {
public sealed class HolographicFrame {
HolographicFrameId Id { get; }
public struct HolographicFrameId
public sealed class HolographicFrameRenderingReport
public sealed class HolographicFrameScanoutMonitor : IClosable
public sealed class HolographicFrameScanoutReport
public sealed class HolographicSpace {
HolographicFrameScanoutMonitor CreateFrameScanoutMonitor(uint maxQueuedReports);
namespace Windows.Management.Deployment {
public sealed class AddPackageOptions
public enum DeploymentOptions : uint {
StageInPlace = (uint)4194304,
public sealed class PackageManager {
IAsyncOperationWithProgress AddPackageByUriAsync(Uri packageUri, AddPackageOptions options);
IVector FindProvisionedPackages();
PackageStubPreference GetPackageStubPreference(string packageFamilyName);
IAsyncOperationWithProgress RegisterPackageByUriAsync(Uri manifestUri, RegisterPackageOptions options);
IAsyncOperationWithProgress RegisterPackagesByFullNameAsync(IIterable packageFullNames, RegisterPackageOptions options);
void SetPackageStubPreference(string packageFamilyName, PackageStubPreference useStub);
IAsyncOperationWithProgress StagePackageByUriAsync(Uri packageUri, StagePackageOptions options);
public enum PackageStubPreference
public enum PackageTypes : uint {
All = (uint)4294967295,
public sealed class RegisterPackageOptions
public enum RemovalOptions : uint {
PreserveRoamableApplicationData = (uint)128,
public sealed class StagePackageOptions
public enum StubPackageOption
namespace Windows.Media.Audio {
public sealed class AudioPlaybackConnection : IClosable
public sealed class AudioPlaybackConnectionOpenResult
public enum AudioPlaybackConnectionOpenResultStatus
public enum AudioPlaybackConnectionState
namespace Windows.Media.Capture {
public sealed class MediaCapture : IClosable {
MediaCaptureRelativePanelWatcher CreateRelativePanelWatcher(StreamingCaptureMode captureMode, DisplayRegion displayRegion);
public sealed class MediaCaptureInitializationSettings {
Uri DeviceUri { get; set; }
PasswordCredential DeviceUriPasswordCredential { get; set; }
public sealed class MediaCaptureRelativePanelWatcher : IClosable
namespace Windows.Media.Capture.Frames {
public sealed class MediaFrameSourceInfo {
Panel GetRelativePanel(DisplayRegion displayRegion);
namespace Windows.Media.Devices {
public sealed class PanelBasedOptimizationControl
namespace Windows.Media.MediaProperties {
public static class MediaEncodingSubtypes {
public static string Pgs { get; }
public static string Srt { get; }
public static string Ssa { get; }
public static string VobSub { get; }
public sealed class TimedMetadataEncodingProperties : IMediaEncodingProperties {
public static TimedMetadataEncodingProperties CreatePgs();
public static TimedMetadataEncodingProperties CreateSrt();
public static TimedMetadataEncodingProperties CreateSsa(byte[] formatUserData);
public static TimedMetadataEncodingProperties CreateVobSub(byte[] formatUserData);
namespace Windows.Networking.BackgroundTransfer {
public sealed class DownloadOperation : IBackgroundTransferOperation, IBackgroundTransferOperationPriority {
void RemoveRequestHeader(string headerName);
void SetRequestHeader(string headerName, string headerValue);
public sealed class UploadOperation : IBackgroundTransferOperation, IBackgroundTransferOperationPriority {
void RemoveRequestHeader(string headerName);
void SetRequestHeader(string headerName, string headerValue);
namespace Windows.Networking.Connectivity {
public enum NetworkAuthenticationType {
Owe = 12,
namespace Windows.Networking.NetworkOperators {
public sealed class NetworkOperatorTetheringAccessPointConfiguration {
TetheringWiFiBand Band { get; set; }
bool IsBandSupported(TetheringWiFiBand band);
IAsyncOperation IsBandSupportedAsync(TetheringWiFiBand band);
public sealed class NetworkOperatorTetheringManager {
public static void DisableNoConnectionsTimeout();
public static IAsyncAction DisableNoConnectionsTimeoutAsync();
public static void EnableNoConnectionsTimeout();
public static IAsyncAction EnableNoConnectionsTimeoutAsync();
public static bool IsNoConnectionsTimeoutEnabled();
public enum TetheringWiFiBand
namespace Windows.Networking.PushNotifications {
public static class PushNotificationChannelManager {
public static event EventHandler ChannelsRevoked;
public sealed class PushNotificationChannelsRevokedEventArgs
public sealed class RawNotification {
IBuffer ContentBytes { get; }
namespace Windows.Security.Authentication.Web.Core {
public sealed class WebAccountMonitor {
event TypedEventHandler AccountPictureUpdated;
namespace Windows.Security.Isolation {
public sealed class IsolatedWindowsEnvironment
public enum IsolatedWindowsEnvironmentActivator
public enum IsolatedWindowsEnvironmentAllowedClipboardFormats : uint
public enum IsolatedWindowsEnvironmentAvailablePrinters : uint
public enum IsolatedWindowsEnvironmentClipboardCopyPasteDirections : uint
public struct IsolatedWindowsEnvironmentContract
public struct IsolatedWindowsEnvironmentCreateProgress
public sealed class IsolatedWindowsEnvironmentCreateResult
public enum IsolatedWindowsEnvironmentCreateStatus
public sealed class IsolatedWindowsEnvironmentFile
public static class IsolatedWindowsEnvironmentHost
public enum IsolatedWindowsEnvironmentHostError
public sealed class IsolatedWindowsEnvironmentLaunchFileResult
public enum IsolatedWindowsEnvironmentLaunchFileStatus
public sealed class IsolatedWindowsEnvironmentOptions
public static class IsolatedWindowsEnvironmentOwnerRegistration
public sealed class IsolatedWindowsEnvironmentOwnerRegistrationData
public sealed class IsolatedWindowsEnvironmentOwnerRegistrationResult
public enum IsolatedWindowsEnvironmentOwnerRegistrationStatus
public sealed class IsolatedWindowsEnvironmentProcess
public enum IsolatedWindowsEnvironmentProcessState
public enum IsolatedWindowsEnvironmentProgressState
public sealed class IsolatedWindowsEnvironmentShareFolderRequestOptions
public sealed class IsolatedWindowsEnvironmentShareFolderResult
public enum IsolatedWindowsEnvironmentShareFolderStatus
public sealed class IsolatedWindowsEnvironmentStartProcessResult
public enum IsolatedWindowsEnvironmentStartProcessStatus
public sealed class IsolatedWindowsEnvironmentTelemetryParameters
public static class IsolatedWindowsHostMessenger
public delegate void MessageReceivedCallback(Guid receiverId, IVectorView message);
namespace Windows.Storage {
public static class KnownFolders {
public static IAsyncOperation GetFolderAsync(KnownFolderId folderId);
public static IAsyncOperation RequestAccessAsync(KnownFolderId folderId);
public static IAsyncOperation RequestAccessForUserAsync(User user, KnownFolderId folderId);
public enum KnownFoldersAccessStatus
public sealed class StorageFile : IInputStreamReference, IRandomAccessStreamReference, IStorageFile, IStorageFile2, IStorageFilePropertiesWithAvailability, IStorageItem, IStorageItem2, IStorageItemProperties, IStorageItemProperties2, IStorageItemPropertiesWithProvider {
public static IAsyncOperation GetFileFromPathForUserAsync(User user, string path);
public sealed class StorageFolder : IStorageFolder, IStorageFolder2, IStorageFolderQueryOperations, IStorageItem, IStorageItem2, IStorageItemProperties, IStorageItemProperties2, IStorageItemPropertiesWithProvider {
public static IAsyncOperation GetFolderFromPathForUserAsync(User user, string path);
namespace Windows.Storage.Provider {
public sealed class StorageProviderFileTypeInfo
public sealed class StorageProviderSyncRootInfo {
IVector FallbackFileTypeInfo { get; }
public static class StorageProviderSyncRootManager {
public static bool IsSupported();
namespace Windows.System {
public sealed class UserChangedEventArgs {
IVectorView ChangedPropertyKinds { get; }
public enum UserWatcherUpdateKind
namespace Windows.UI.Composition.Interactions {
public sealed class InteractionTracker : CompositionObject {
int TryUpdatePosition(Vector3 value, InteractionTrackerClampingOption option, InteractionTrackerPositionUpdateOption posUpdateOption);
public enum InteractionTrackerPositionUpdateOption
namespace Windows.UI.Input {
public sealed class CrossSlidingEventArgs {
uint ContactCount { get; }
public sealed class DraggingEventArgs {
uint ContactCount { get; }
public sealed class GestureRecognizer {
uint HoldMaxContactCount { get; set; }
uint HoldMinContactCount { get; set; }
float HoldRadius { get; set; }
TimeSpan HoldStartDelay { get; set; }
uint TapMaxContactCount { get; set; }
uint TapMinContactCount { get; set; }
uint TranslationMaxContactCount { get; set; }
uint TranslationMinContactCount { get; set; }
public sealed class HoldingEventArgs {
uint ContactCount { get; }
uint CurrentContactCount { get; }
public sealed class ManipulationCompletedEventArgs {
uint ContactCount { get; }
uint CurrentContactCount { get; }
public sealed class ManipulationInertiaStartingEventArgs {
uint ContactCount { get; }
public sealed class ManipulationStartedEventArgs {
uint ContactCount { get; }
public sealed class ManipulationUpdatedEventArgs {
uint ContactCount { get; }
uint CurrentContactCount { get; }
public sealed class RightTappedEventArgs {
uint ContactCount { get; }
public sealed class SystemButtonEventController : AttachableInputObject
public sealed class SystemFunctionButtonEventArgs
public sealed class SystemFunctionLockChangedEventArgs
public sealed class SystemFunctionLockIndicatorChangedEventArgs
public sealed class TappedEventArgs {
uint ContactCount { get; }
namespace Windows.UI.Input.Inking {
public sealed class InkModelerAttributes {
bool UseVelocityBasedPressure { get; set; }
namespace Windows.UI.Text {
public enum RichEditMathMode
public sealed class RichEditTextDocument : ITextDocument {
void GetMath(out string value);
void SetMath(string value);
void SetMathMode(RichEditMathMode mode);
namespace Windows.UI.ViewManagement {
public sealed class ApplicationView {
bool CriticalInputMismatch { get; set; }
bool TemporaryInputMismatch { get; set; }
void ApplyApplicationUserModelID(string value);
public sealed class UISettings {
event TypedEventHandler AnimationsEnabledChanged;
event TypedEventHandler MessageDurationChanged;
public sealed class UISettingsAnimationsEnabledChangedEventArgs
public sealed class UISettingsMessageDurationChangedEventArgs
namespace Windows.UI.ViewManagement.Core {
public sealed class CoreInputView {
event TypedEventHandler PrimaryViewHiding;
event TypedEventHandler PrimaryViewShowing;
public sealed class CoreInputViewHidingEventArgs
public enum CoreInputViewKind {
Symbols = 4,
public sealed class CoreInputViewShowingEventArgs
public sealed class UISettingsController

Improving form controls in Microsoft Edge and Chromium – Microsoft Edge Blog

Since we began work on the next version of Microsoft Edge based on Chromium, we’ve been investigating ways to modernize form controls to provide a modern appearance as well as the touch friendliness and accessibility that our users expect from Microsoft Edge today.Over the past few months, we’ve been collaborating closely with the Google Chrome team on this project, and are excited to share the refreshed controls that will be coming to Microsoft Edge Insider builds, or other Chromium browsers near you.

This change brings an improved polish to the form controls and helps bring continuity of design and user experience with the rest of the browser. We have been collaborating closely with the Google Chrome design team to strike a balance between our design languages with a modern look and feel that feels at home in a variety of Chromium browsers. Below is a comparison of the default controls in Chromium today, compared to the updated controls we’re rolling out:

Windows devices come in a rich array of form factors and input modalities, including traditional desktop and laptop PCs, 2-in-1 devices, and other tablets and pen devices. We heard your feedback looking for a better touch input experience in our early Chromium preview builds, and set out to take an inventory of the controls to identify opportunities to improve the touch experience.

A good example of the touch improvements is the time input; currently, Chromium provides a text input, a clear button and a spinner. Our research found that with the large surface area of the fingertip, small controls that are too close together can be difficult to target precisely, recommending a control size of 23×23 pixels (13×13 DLUs) is a good minimum interactive control size for any input device. By contrast, the spin controls at 15×11 pixels are much too small to be used effectively with touch. The new time input we’re introducing includes a flyout with expected touch affordances, like inertia when scrolling and larger touch targets. Other inputs such as date, color, range received subtle size increases to  important touch targets as well.

Another area we examined is the focus rectangle that wraps a control when a user focuses the control. This is an important accessibility feature, as it allows the user to track where they’re actively focused, especially while navigating via keyboard.
Our team identified three different potential focus indicators that aligned with Microsoft’s design language, guaranteed high contrast on any background content, and provided a clean and aesthetically pleasing appearance.
We then ran interactive user studies to identify the best option, compared against Chromium’s current default focus rectangle as a baseline. We found that, while preferences were split for aesthetics, one option was the clear leader for accessibility. We’ve chosen that option as the new focus rectangle in Microsoft Edge, which you can see below:

Additionally, all these controls now support Windows High Contrast, which allows the user to define specific colors to improve the visual experience. All sites that utilize the built-in controls will benefit from these updated controls whenever the user is in High Contrast mode, without web developers doing any extra work. However, webdevelopers can adjust these styles if they want by utilizing the new CSS forced-color-adjust property and the prefers-contrastmedia query that are actively being standardized.

We’ve also updated our implementation to ensure great keyboard support across each control. For example, in the new color input, you can either navigate a single value using the arrow keys with the color well selected; if you hold the Ctrl key on Windows (Cmd key on Mac), it will move by 10 values allowing for quick traversal of the color well.
Finally, we updated the mappings for the controls to map to the HTML Accessibility API Mappings specification, to ensure a great experience for users who use assistive technologies (such as screen readers).

These updated controls are now available in Canary and Dev channel builds of Microsoft Edge, and will be coming upstream to other Chromium browsers in the near future. We’re excited as this work begins to ship out to users, and as the controls continue to evolve, we greatly appreciate any feedback that you may have in how we can improve the experience. Just click the smiley face in the top-right to Send Feedback, and let us know what you think!
— Greg Whitworth, Senior Program Manager, Microsoft Edge