In January 2026, Ignat Ternyev enhanced the tree-sitter/tree-sitter repository by developing a visual improvement for the Playground feature. He implemented a full-row highlight for nodes, making them more visually distinct and improving overall readability and accessibility. Using CSS and HTML, Ignat introduced theme-aware CSS variables to support both light and dark modes, ensuring consistent styling across different themes. This update aligned the Playground’s appearance with the broader design system and reduced cognitive load for users interacting with highlighted nodes. The work demonstrated a focused application of front end development and CSS styling skills, delivering a targeted, user-centric enhancement.