micromark is a modular, security-focused, and highly extensible CommonMark-compliant markdown parser and HTML renderer. Designed for speed and robustness, it breaks down the complexities of markdown into smaller, manageable modules, allowing developers to selectively enable or disable features. The flexible extension mechanism enables customization with support for GFM. micromark prioritizes security by providing a safe and predictable environment and is known for its comprehensive test suite and focus on standards adherence.