Template, SlotKey, and RenderContext in Real Projects

The template model compiles stable page structure once and injects request-specific values at render time.

Build Static Structure Once

Create reusable templates for repeated shells and avoid mutating module build structure per request.

Keep Dynamic Values in Context

Put runtime values in RenderContext using typed SlotKey instances for safer composition.

Practical Benefit

This reduces accidental cross-request mutation and keeps dynamic behavior explicit.

Good Fit for HTMX Fragments

Template-based fragments are straightforward to return from controller endpoints.