Merge branch 'staging' of https://github.com/AgoraIO/Doc-Source-Private…

… into staging

shared/video-sdk/reference/release-notes/web.mdx

@@ -11,6 +11,43 @@ See [Supported platforms](../reference/supported-platforms).
 
 See [Known issues](known-issues).
 
+### v4.20.0
+
+v4.20.0 was released on December 8, 2023.
+
+#### Compatibility changes
+
+Prior to v4.20.0, the `IRemoteAudioTrack.setPlaybackDevice` method could be invoked on Firefox, but an echo issue would occur due to a Firefox [bug](https://bugzilla.mozilla.org/show_bug.cgi?id=1849108). To improve the user experience, starting from v4.20.0, the SDK throws a `NOT_SUPPORTED` error when this method is called.
+
+If you are using the `IRemoteAudioTrack.setPlaybackDevice` method, you need to make code modifications after upgrading to v4.20.0.
+
+#### New features
+
+On certain versions of iOS devices, the app call might not automatically resume after being interrupted by a WeChat call or system phone call. To address this issue, this release introduces the `"audio-context-state-changed"` event to monitor whether the app call has been interrupted, and the `resumeAudioContext` method to restore the app call.
+
+<ProductWrapper notAllowed="voice-calling">
+For usage details, refer to the [API documentation](https://api-ref.agora.io/en/video-sdk/web/4.x/interfaces/iagorartc.html#resumeaudiocontext).
+</ProductWrapper>
+
+<ProductWrapper product="voice-calling">
+For usage details, refer to the [API documentation](https://api-ref.agora.io/en/voice-sdk/web/4.x/interfaces/iagorartc.html#resumeaudiocontext).
+</ProductWrapper>
+
+#### Improvements
+
+This release includes the following improvements:
+
+- Reduces the time it takes to join a channel when the user ID is a string.
+- Supports audio sharing on the ChromeOS platform when sharing the entire screen or a Chrome tab.
+
+#### API changes
+
+**Added**
+
+- `resumeAudioContext`
+- `AgoraRTC.on("audio-context-state-changed")`
+
+
 ### v4.19.3
 
 v4.19.3 was released on November 2, 2023.