Worked on the mdn/translated-content repository to enhance the accuracy of Chinese-language documentation for JavaScript task execution. Focused on improving localization quality, the developer identified and corrected a translation issue that clarified the distinction between main thread and Web Worker behavior. Using Markdown and leveraging skills in documentation and translation, the fix aligned the zh-cn content with the English source, reducing confusion for developers referencing performance-critical sections. The targeted update was reviewed and committed, reinforcing the reliability of localized resources. This contribution supported the ongoing workflow for translation traceability and ensured that technical guidance remained consistent across language versions.