A pre-expanded LaTeX + amsmath + unicode-math format and the Latin Modern Math font are packaged and loaded into a WebAssembly build of a portable TeX engine. No server, no kpathsea — type math below and it is typeset locally.
→ Try the structural WYSIWYG editor built on the same engine.
Hover a glyph, fraction bar, radical or delimiter in the rendered math to highlight the exact TeX it came from.