Worked on the w3c/webdriver-bidi repository to deliver User Context Propagation for Protocol Events, introducing a userContext property to protocol events to reliably associate them with their originating user context. This enhancement improved the ergonomics of event parameters and enabled more robust event subscriptions for downstream consumers. Addressed build errors resulting from these changes by refining patch scripts and stabilizing the build process. Extended userContext support to additional protocol outputs, such as browsingContext.create results and input.fileDialogOpened events, ensuring consistent propagation. Utilized JavaScript and full stack development skills to align the implementation with updated WebDriver BiDi specifications and integration requirements.