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4.36/4.37/4.38/4.39/4.40 release notes (#2582)
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‎scripts/release-updates.sh‎

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done
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OLD_BLOG="website_and_docs/content/blog/2025/selenium-4-$OLD_VERSION-released.md"
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NEW_BLOG="website_and_docs/content/blog/2025/selenium-4-$NEW_VERSION-released.md"
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NEW_BLOG="website_and_docs/content/blog/2026/selenium-4-$NEW_VERSION-released.md"
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cp "$OLD_BLOG" "$NEW_BLOG"
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git add "$NEW_BLOG"
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‎website_and_docs/content/blog/2025/selenium-4-36-released.md‎

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---
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title: "Selenium 4.36 Released!"
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linkTitle: "Selenium 4.36 Released!"
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date: 2025-09-18
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tags: [ "selenium" ]
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categories: [ "releases" ]
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author: Diego Molina [@diemol](https://www.diemol.com)
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images:
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- "/images/blog/2025/selenium_4.36.jpg"
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description: >
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Today we're happy to announce that Selenium 4.36 has been released!
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---
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We’re excited to announce the release of **Selenium 4.36** for JavaScript, Ruby, Python, .NET, Java
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and the Grid! 🎉
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Links to all assets can be found on our [downloads page][downloads].
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---
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# Selenium 4.36 Released
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Selenium 4.36 is out with updates across all language bindings and the Grid. This release focuses
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on expanding BiDi capabilities, improving developer experience through logging and debugging
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enhancements, and cleaning up deprecated code paths. It also includes dependency updates, new
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tests, and stability improvements.
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---
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## 🚩 Highlights
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- **Chrome DevTools support** is now: v140, v139, and v138.
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- **Expanded BiDi Support**:
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- New events and modules added across Python, Java, .NET, and Ruby (e.g. `downloadEnd`, navigation, cookies, network collectors, WebExtensions).
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- **Selenium Grid**:
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- Regression fix in request handling and better resource cleanup.
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- Light/Dark Mode toggle added to Grid UI.
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- **Developer Experience**:
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- Improved error messages and type annotations in Python.
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- Better logging options across bindings, including Chrome and Safari support.
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- Cleaner structure for BiDi internals in .NET.
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---
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## 🔧 Language-specific Updates
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### Java
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- Extended BiDi support:
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- Added `DownloadInfo`, `onNavigationFailed`, and related test hooks.
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- Screenshot hooks added to `WebDriverListener`.
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- Unified and refactored `Select` class methods.
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- Fixed concurrency issue in Selenium Manager.
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- Improved resource handling and extended `HttpCommandExecutor` scope.
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- Added `@JSpecify` annotations to exception classes and drivers.
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- Fixed broken documentation links.
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### Python
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- BiDi:
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- Added support for `historyUpdated`, `navigate`, and `downloadEnd` events.
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- Added test for BiDi Data URL handling.
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- Logging:
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- Enabled `--enable-chrome-logs` for Chrome to inherit browser I/O streams.
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- Better error handling:
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- Clearer messages on selector issues (e.g. `InvalidSelectorException` for compound class names).
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- Refactors:
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- Converted all relative imports to absolute.
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- Updated example for `DesiredCapabilities` to use modern `Options`.
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- Fixed:
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- Type annotations across multiple files.
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- Proxy port handling in IPv6 environments.
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- Cleanups:
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- Removed unused `driver_instance` from `conftest.py`.
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### .NET
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- BiDi:
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- Support for `network collectors`, `response body`, and `WebExtensions`.
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- Improved internal type safety, serialization, and navigation tracking.
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- Introduced `BaseNavigationInfo` and removed obsolete logic.
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- Logging:
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- Added SafariDriver logging toggle.
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- Conditionally redirect browser output streams.
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- Suppressed unwanted messages from drivers.
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- Infrastructure:
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- Better support for older .NET Framework copying Selenium Manager.
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- Fixed port discovery in IPv4-only environments.
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- Documentation:
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- Fixed broken links in code and website.
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### Ruby
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- BiDi:
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- Implemented `browser` module with user context methods.
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- Support for getting client windows.
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- Removed Chrome FedCM test guards (now fixed in Chrome).
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- Other:
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- Updated `unhandled_prompt_behavior` to support hash syntax.
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- Fixed unit tests and exception doc links.
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### JavaScript
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- Updated several dependencies:
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- `react`, `react-router-dom`, `material-ui`, `ws`, and more.
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- BiDi-related fixes:
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- Text transformation issue in atoms corrected (`text-transform: capitalize`).
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### Rust (Selenium Manager)
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- Now honors full browser version, even when only major version is installed.
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- Logs browser path even in offline mode.
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- Updated to Rust edition 2024 and bumped dependencies (`rules_cc`, `rulest_rust`, etc.).
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---
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## 🖥️ Selenium Grid
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- **Fixed regression** where requests were incorrectly rejected when nodes had capabilities but no free slots.
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- **Improved resource handling**:
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- `HttpClient` is now closed properly after session teardown.
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- Improved timeout handling between Router and Node.
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- **Updated to Netty 4.2.4** for better network handling.
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- **New UI Feature**:
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- Added Light/Dark mode toggle to Grid interface.
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---
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## 📚 Documentation & Internal Tooling
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- Fixed and updated:
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- Broken API doc links
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- CONTRIBUTING.md guidelines
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- Linting and type annotations
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- Bumped:
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- Python dev dependencies
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- Setup scripts and GitHub Actions tooling
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---
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### 🐳 Docker Selenium
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- K8s: Switch image registry for Bitnami deps image in sub charts ([#2960](https://github.com/SeleniumHQ/docker-selenium/pull/2960))
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- Docker: Fix regression SE_NODE_STEREOTYPE_EXTRA could not merge stereotypes ([#2971](https://github.com/SeleniumHQ/docker-selenium/pull/2971))
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- Update ubuntu:noble Docker digest to 728785b ([#2972](https://github.com/SeleniumHQ/docker-selenium/pull/2972))
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- [See all changes](https://github.com/SeleniumHQ/docker-selenium/releases)
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<br>
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We thank all our contributors for their incredible efforts in making Selenium better with every
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release. ❤️
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For a detailed look at all changes, check out
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the [release notes](https://github.com/SeleniumHQ/selenium/releases/tag/selenium-4.36.0).
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<br>
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## Contributors
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**Special shout-out to everyone who helped the Selenium Team get this release out!**
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### [Selenium](https://github.com/SeleniumHQ/selenium)
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<div class="d-flex justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/NoStory-py" >}}
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{{< gh-user "https://api.github.com/users/Osseta" >}}
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{{< gh-user "https://api.github.com/users/Paresh-0007" >}}
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{{< gh-user "https://api.github.com/users/VbhvGupta" >}}
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{{< gh-user "https://api.github.com/users/giulong" >}}
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{{< gh-user "https://api.github.com/users/iampopovich" >}}
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{{< gh-user "https://api.github.com/users/lauromoura" >}}
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{{< gh-user "https://api.github.com/users/mtrea" >}}
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{{< gh-user "https://api.github.com/users/rpallavisharma" >}}
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{{< gh-user "https://api.github.com/users/vicky-iv" >}}
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</div>
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</div>
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</div>
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### [Selenium Docs & Website](https://github.com/SeleniumHQ/seleniumhq.github.io)
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/Anilkumar-Shrestha" >}}
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{{< gh-user "https://api.github.com/users/Tuscann" >}}
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{{< gh-user "https://api.github.com/users/beinghumantester" >}}
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{{< gh-user "https://api.github.com/users/noritaka1166" >}}
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{{< gh-user "https://api.github.com/users/olleolleolle" >}}
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{{< gh-user "https://api.github.com/users/rpallavisharma" >}}
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</div>
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</div>
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</div>
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### [Docker Selenium](https://github.com/SeleniumHQ/docker-selenium)
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/anwaramoon" >}}
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{{< gh-user "https://api.github.com/users/f-lopes" >}}
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{{< gh-user "https://api.github.com/users/pplulee" >}}
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</div>
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</div>
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</div>
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### [Selenium Team Members][team]
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**Thanks as well to all the team members who contributed to this release:**
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<div class="row justify-content-center">
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<div class="col-11 p-4 bg-transparent">
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<div class="row justify-content-center">
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{{< gh-user "https://api.github.com/users/aguspe" >}}
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{{< gh-user "https://api.github.com/users/asolntsev" >}}
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{{< gh-user "https://api.github.com/users/AutomatedTester" >}}
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{{< gh-user "https://api.github.com/users/bonigarcia" >}}
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{{< gh-user "https://api.github.com/users/cgoldberg" >}}
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{{< gh-user "https://api.github.com/users/diemol" >}}
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{{< gh-user "https://api.github.com/users/harsha509" >}}
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{{< gh-user "https://api.github.com/users/joerg1985" >}}
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{{< gh-user "https://api.github.com/users/nvborisenko" >}}
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{{< gh-user "https://api.github.com/users/p0deje" >}}
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{{< gh-user "https://api.github.com/users/pujagani" >}}
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{{< gh-user "https://api.github.com/users/RenderMichael" >}}
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{{< gh-user "https://api.github.com/users/shbenzer" >}}
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{{< gh-user "https://api.github.com/users/shs96c" >}}
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{{< gh-user "https://api.github.com/users/titusfortner" >}}
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{{< gh-user "https://api.github.com/users/VietND96" >}}
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</div>
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</div>
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</div>
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Stay tuned for updates by following SeleniumHQ on:
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- [Mastodon](https://mastodon.social/@seleniumHQ@fosstodon.org)
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- [BlueSky](https://bsky.app/profile/seleniumconf.bsky.social)
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- [LinkedIn](https://www.linkedin.com/company/selenium/)
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- [Selenium Community YouTube Channel](https://www.youtube.com/@SeleniumHQProject/streams)
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- [X (Formerly Twitter)](https://twitter.com/seleniumhq)
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Happy automating!
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[downloads]: /downloads
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[bindings]: /downloads#bindings
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[team]: /project/structure
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[BiDi]: https://github.com/w3c/webdriver-bidi

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