markdown-it

Fully adheres to the CommonMark specification, ensuring predictable and consistent parsing across platforms, as highlighted in the README's emphasis on following the spec.

Supports a rich ecosystem of community-written plugins for adding syntax like footnotes and emojis, enabling easy customization without modifying core code.

Optimized for speed with benchmarks showing competitive parsing rates, making it suitable for high-traffic applications, as demonstrated in the performance tests included.

Sanitizes HTML input to prevent XSS attacks, providing secure rendering out of the box without additional configuration, as noted in the safety documentation.