I started the article thinking "ohhh the horror, this will not go well." And I ended up being mildly impressed with the typesetting quality, especially for the relative simplicity of the approach. So kudos to the author for demonstrating the flexibility of CSS.

I am concerned that there are lots of edge cases, essentially ligatures for engraving, that might not compose so well. A triad, or the author's called-out relative head spacing of 8th and 16th notes, or letting the program align different parts across different grids - would this also work well? Lilypond has proven to be exceptionally flexible for these kinds of complexities.