During February 2026, Tomas Hernandez enhanced the HTML Linter in the biomejs/biome repository by adding support for the 'closedby' attribute on <dialog> elements. He updated the linter’s validation logic and associated tests using JavaScript and Rust, ensuring the new attribute was correctly recognized and validated according to evolving web standards. Tomas also refined the noUnknownAttribute rule to prevent false positives, which reduced unnecessary lint noise in continuous integration workflows. His work focused on improving standards compliance and the developer experience for front end teams, demonstrating a solid understanding of both JavaScript-based tooling and robust test-driven development practices.