Slack developers building apps with Block Kit can now leverage five new supported markdown types for creating rich text content:

New Markdown Types:

• Syntax-highlighted code blocks — Language-specific code formatting with proper syntax highlighting
• Tables — Structured tabular data presentation
• Task lists — Checklist-style content with checkbox support
• Dividers — Visual separators for content organization
• Variable-sized headers — Flexible heading hierarchy for better content structure

What developers need to know: These new markdown types work within Block Kit's rich text block and markdown block elements, allowing developers to create more visually organized and readable messages in Slack apps. This enhancement makes it possible to present complex information, code samples, and structured data more effectively within Slack's interface.

Next steps: Developers using Block Kit should refer to the updated rich text block and markdown block reference documentation to explore the new markdown types and integrate them into their apps.