It seems TeX/LaTeX is a major inspiration in this, though there can be seen some room for improvement for details like hyphenation, expansion/protusion and microtypography. Not sure if/how a web engine can reach to those points but still it seems this has a potential niche and market outcome, so congrats.

Though personally I wish stuff like ConTeXt was more popular and approachable - to my humble knowledge their Lua backend seems to have huge potential, I am doing my invoices with ConTeXt/Lua.