---
title: Javascript-SDK - 4.10.0
slug: feature-experimentation/release-notes/javascript-sdk-4-10-0
docTags: 
createdAt: 2026-07-20T15:44:20.696Z
---

## [\[4.10.0\] - October 11, 2023](docId\:vZGKOV_FiHv_9yPJ5MEB_)

### [New Features](docId\:vZGKOV_FiHv_9yPJ5MEB_)

- Add support for configurable closing event dispatcher, and dispatching events using sendBeacon in the browser on instance close ([#876](https://github.com/optimizely/javascript-sdk/pull/876), [#874](https://github.com/optimizely/javascript-sdk/pull/874), [#873](https://github.com/optimizely/javascript-sdk/pull/873))

[https://github.com/optimizely/javascript-sdk/releases/tag/v4.10.0](https://github.com/optimizely/javascript-sdk/releases/tag/v4.10.0)