目前selenium的最新版本是v4.1.2（截止到2022年3月7日），看了一下v4.0.0到v4.1.2的升级变化，发现selenium4正式版与 rc版本相比，核心功能并没有发生变化，主要变化的内容总结出以下两点：
1. 对CDP协议高版本的不断支持,关于cdp协议，可以参考文章Selenium进阶——使用ChromeDevTools协议编写自己的ChromeDriver
2. Selenium Grid的bug修复 以及稳定性的提升
备注：关于v4.1.2中新增的功能Add new desktop cast command for Chromium，查了一下就是chrome的投屏功能，涉及的自动化测试场景应该非常有限。
如果大家想要了解Selenium4.0的重要功能变化情况，可以看一下我之前写的文章：
重磅！自动化测试工程师必看！selenium4 RC版本正式发布！
v4.0.0到v4.1.2的升级变化的详细信息如下：
v4.1.2
======
* Supported CDP versions: 85, 95, 96, 97
* Add new desktop cast command for Chromium
* BugFix: Update toJson() method creation for integer type in CdpClientGenerator
* Fix Javadocs FluentWait's sample usage wrt durations
* [grid] Throw ServerBindException when server cannot start due to network issues
* Add support for CDP Chrome 97
* Throw error when using custom client config with local driver
* Adding a builder() to all drivers to generate the correct default options instance
* Use class' class loader when looking up `HttpClient` factory
* Remove max duration value to allow retries during network connection failures
* allow setting a different keyboard or pointer for actions on input devices
* [grid] Guarding how the server reads parameters to keep it stable
* Remove connection timeout setter, a static 10s value is used
* [grid] Getting session requests from the queue faster
* [grid] Reworking how new session requests are processed, querying queue only
when Grid has availability
* [grid] Fix added missing quotation marks in examples (cli help)
* Replace deprecated OpenTelemetrySdk creation API
* [grid] Improving Node health check execution
* [grid] Adding back support for unix domain sockets
* Allow disabling tracing in RemoteWebDriver
* Replace dynamic proxy with ByteBuddy for WebDriverDecorator
* Log Timestamp flag added
v4.1.1
======
* Supported CDP versions: 85, 94, 95, 96
* Allow custom tracing to integrate with existing OpenTelemetry tracing
* Avoiding NoClassDefFoundError by waiting for completion of already started tasks
* use addon parameter with base64 encoding instead of path parameter
that requires using file detector and upload
* support installing temporary addon in Firefox
* Remove references to opera_blink in favour of opera
* BugFix: Handle null parameters in TracedCommandExecutor
* BugFix: Following redirects by default in HttpClient
* BugFix: Forwarding CDP/BiDi connections to the container in Dynamic Grid
* BugFix: Do not log screenshots payload in debug mode
* BugFix: Mapping Slot fields properly for json payloads
* BugFix: Configuring relay service via CLI
* BugFix: Adding a "bind-host" flag to start Grid properly when the
server cannot bind to the host, fixes this for environments like Docker
v4.1.0
======
* Supported CDP versions: 85, 94, 95, 96
* Removed USE_CHROMIUM from EdgeOptions as new Edge is the default
* [grid] Fixed command completion for ZSH when using the Selenium Server
* Pass WebDriver instead of Loggable to allow augmentation of HasLogEvents
* [grid] Using a random port when "-1" is set as port number for the Selenium Server
* Handle Json parsing error such that future messages are not blocked
* [grid] Fix host option
* Changing type of extraInfo from HashMap to ConcurrentHasMap to avoid
ConcurrentModificationException while reading exception message by parallel threads
* Add retry http request filter for transient errors.
* Fix Javadoc code block formatting
* [grid] Using non-loopback address when default config is used
* Fix classloading error in host identifier
* Split OpenTelemetry command in order to facilitate search by tags
v4.0.0
======
* Supported CDP versions: 85, 93, 94, 95
* Improved "relay" service description in help
* Switch to different JCIP annotations for Apache 2 license
* Deprecated USE_CHROMIUM so we can remove it after 4.0
* Add a --hub flag for the Node