SDK 1.0.3908-prerelease, for Runtime 147 (Mar. 16, 2026)

Release notes for Microsoft Edge WebView2 Prerelease SDK, release date: Mar. 16, 2026.

NuGet package for WebView2 SDK 1.0.3908-prerelease

For full API compatibility, this Prerelease version of the WebView2 SDK requires the WebView2 Runtime that ships with Microsoft Edge version 147.0.3908.0 or later; see Runtime 147.0.3912.50 (Apr. 13, 2026).

Promotions to Phase 2 (Stable in Prerelease)

The following APIs skipped Phase 1: Experimental in Prerelease, and have been directly added to Phase 2: Stable in Prerelease, and are included in this Prerelease SDK.

Manage persistent storage permissions for web content

The PersistentStorage permission allows a WebView2 app to handle requests from web content to persist data that's created by Storage APIs, service workers, and related technologies. The PersistentStorage permission is an enum member in the CoreWebView2PermissionKind enum.

When this permission is granted, the browser doesn't evict stored data during low-disk-space scenarios. This ensures reliable offline and caching behavior for the site.

.NET/C#

• CoreWebView2PermissionKind Enum
  • PersistentStorage

WinRT/C#

• CoreWebView2PermissionKind Enum
  • PersistentStorage

Win32/C++

• COREWEBVIEW2_PERMISSION_KIND enum
  • COREWEBVIEW2_PERMISSION_KIND_PERSISTENT_STORAGE

See also

• Runtime 147.0.3912.50 (Apr. 13, 2026)
• Release notes for WebView2
  • Release notes for the WebView2 Runtime
  • Release notes for WebView2 SDKs