Worked on improving documentation quality and localization accuracy for the javascript-tutorial/uk.javascript.info repository, focusing on the JavaScript class inheritance article. Addressed a factual inaccuracy in the explanation of class inheritance and clarified the alert output behavior during object instantiation, ensuring the documentation aligns with actual JavaScript semantics. Used Markdown to update and refine the content, while also correcting Ukrainian grammar to enhance readability for local learners. Emphasized documentation quality assurance workflows to maintain consistency and reduce confusion for users. The work contributed to more reliable educational resources, supporting higher engagement and reducing the need for support queries from Ukrainian readers.