GitHub renders more than just code.

The following are supported:

  • various image diff modes (side-by-side, swipe, blend)
  • *.stl 3D models, incl. webGL acceleration & inline
  • *.csv & *.tsv tables, incl. searching
  • *.geojson & *.topojson maps, incl. inline
  • *.ipynb Jupyter Notebooks
    • in my experience often need to refresh a few times to load properly)
  • *.mermaid & *.mmd flowcharts, incl. inline
  • *.pdf