Worked on enhancing HTML export rendering in the typst/typst repository by addressing issues with CSS relative value handling, particularly for percentage-based and mixed relative and absolute lengths. Focused on ensuring accurate formatting and correct image size rendering during HTML export, which improved the reliability of web workflows and downstream document generation. Utilized Rust, CSS, and HTML to implement a robust fix, expanding regression test coverage to include diverse image sizing scenarios and prevent future regressions. Validated outputs against the existing test suite, contributing to greater stability and user trust in exported documents. Demonstrated careful debugging and test-driven development throughout the process.