During February 2025, Abesmon enhanced Markdown input handling for the toeverything/AFFiNE repository by developing a feature that broadens support for horizontal rule shortcuts. Leveraging TypeScript and JavaScript within a React-based editor, Abesmon introduced the isHorizontalRuleMarkdown validation, enabling users to insert horizontal rules using various combinations of hyphens, asterisks, and underscores. This update improved formatting reliability and reduced user friction by ensuring consistent rendering of dividers across documents. The work focused on robust Markdown parsing and input validation, addressing formatting errors and streamlining the editing experience. The depth of the solution reflects careful attention to user experience and maintainability.