New Rich Text Features in Block Kit

Slack is expanding the markdown capabilities available to developers building Block Kit applications. The platform now supports five new markdown types for rich text rendering:

• Syntax-highlighted code blocks with language-specific formatting
• Tables for structured data display
• Task lists for checklist-style content
• Dividers for visual separation
• Variable-sized headers for content organization

What Developers Need to Know

These new features are available in both the Rich Text Block and Markdown Block references. Developers can immediately start using these elements to create more sophisticated and visually organized messages within their Slack applications.

The expanded markdown support enables richer formatting options without requiring custom UI implementations, making it easier to display complex information like code snippets, data tables, and structured task items directly in Slack channels and messages.

Getting Started

Refer to the official Block Kit documentation for implementation details on each new markdown type. These features are being rolled out gradually across the Slack platform.