b4 = function(e, t, r) {
  if (r.throwOnError || !(e instanceof G))
    throw e;
  var a = R.makeSpan(["katex-error"], [new x0(t)]);
  return a.setAttribute("title", e.toString()), a.setAttribute("style", "color:" + r.errorColor), a;
}
Expose the dom tree node types, which can be useful for type checking nodes.

NOTE: This method is not currently recommended for public use.
The internal tree representation is unstable and is very likely
to change. Use at your own risk.