Math Engine KaTeX
This math engine was built-in until kramdown 2.0 and since then is available through the
kramdown-math-katex gem.
The engine uses KaTeX via the katex rubygem to convert TeX math formulas into KaTeX HTML, using ExecJS under the hood. This eliminates the need for client-side math-rendering Javascript. This engine is somewhat similar to the SsKaTeX math engine, but easier to use and suitable for kramdown input from untrusted users.
See https://github.com/kramdown/math-katex for the documentation.