- Add extensive W3C WebDriver support across bindings (new status, alert, executeScript, window handle, timeouts endpoints; updated capabilities handling and sendKeys behavior)
- Deprecate many legacy driver constructors (FirefoxDriver, ChromeDriver, RemoteWebDriver, IE driver) with warnings, encouraging use of modern Options classes
- Fix numerous bugs (basic auth header encoding, page‑load timeout handling, file uploads, network emulation for Chrome, test suite stability, documentation updates)
Selenium 3.4.0
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Added a new transport layer for generated BiDi modules and improved BiDi schema fidelity, including extensible types and validation of primitives.