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SDK 1.0.4022.49, for Runtime 149 (Jun. 11, 2026)

Release notes for Microsoft Edge WebView2 SDK, release date: Jun. 11, 2026.

NuGet package for WebView2 SDK 1.0.4022.49

For full API compatibility, this Release version of the WebView2 SDK requires WebView2 Runtime 149.0.4022.49 (Jun. 11, 2026) or later.

Promotions to Phase 3 (Stable in Release)

The following APIs have been promoted from Phase 2: Stable in Prerelease, to Phase 3: Stable in Release, and are now included in this Release SDK.

Enable background processing and offline support (WebView2 Worker APIs)

The WebView2 Worker APIs allow host applications to interact with Web Workers to offload tasks from the main thread, improve responsiveness, and support background operations. These Web Workers include Dedicated Workers, Shared Workers, and Service Workers.

These APIs provide:

  • Lifecycle Events: Monitor creation and destruction of workers.
  • Messaging Interfaces: Communicate with workers using PostMessage and WebMessageReceived; specifically:
    • CoreWebView2ServiceWorker.PostWebMessageAsJson
    • CoreWebView2ServiceWorker.PostWebMessageAsString
    • CoreWebView2DedicatedWorker.PostWebMessageAsJson
    • CoreWebView2DedicatedWorker.PostWebMessageAsString
    • CoreWebView2ServiceWorker.WebMessageReceived
    • CoreWebView2DedicatedWorker.WebMessageReceived
    • chrome.webview.postMessage
    • Not: chrome.webview.postMessageWithAdditionalObjects
  • Worker Management: Query and retrieve worker registrations and instances.

Previous phase: Enable background processing and offline support (WebView2 Worker APIs) in SDK 1.0.4015-prerelease, for Runtime 149 (May 11, 2026).

Bug fixes

  • Fixed container safety issues in WebView2 frame and listener code.

See also

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