Seeing what ran

With --| echo: true the cell shows the Lua it ran, fragments rewritten into pandoc constructor calls, above its result:

return pandoc.Blocks({pandoc.Para({pandoc.Str("A"), pandoc.Space(), pandoc.Str("paragraph"), pandoc.Space(), pandoc.Str("with"), pandoc.Space(), pandoc.Emph({pandoc.Str("emphasis")}), pandoc.Str(","), pandoc.Space(), pandoc.Str("built"), pandoc.Space(), pandoc.Str("from"), pandoc.Space(), pandoc.Str("a"), pandoc.Space(), pandoc.Str("fragment.")})})

A paragraph with emphasis, built from a fragment.