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Won't support functionalities

  • \href
  • \includegraphics
  • \lap and other horizontal lapping command (This will probably be reconsidered in the future)
  • \mathchoice and dependent features
  • \smash
  • \overlinesegment, \underlinesegment
  • \pmb
  • \hspace*
  • Exotic composite symbols: \Coloneqq, \coloneq, \Coloneq, \Eqqcolon, \Eqcolon, \colonapprox, \Colonapprox, \colonsim, \Colonsim, \simcolon, \simcoloncolon, \approxcolon, \approxcoloncolon, and also their equivalent \coloncolonequals ...
  • \vcentcolon
  • \textcircle and related \copyright, \registered, etc.

Functionalities that will be supported later

  • gather environment
  • Vmatrix environment
  • \mathnormal

Known parsing differences to KaTeX

  • \not can only accept selected characters following it, because it is no longer backed by \rlap. (This will probably be revisited).
  • The parsing behavior of \overbrace and \underbase with sub-sup pairs will be in line with MathJax rather than KaTeX.
  • \u2258 will be investigated later

Known rendering differences to KaTeX

  • Math functions with limit-like subscript and superscript will not adapt to sub/sup under/over styles under different styles. This breaks TeX spec. This is due to the design of AST, and is in accordance with UnicodeMath designs.
  • Multiple \hlines and || column separators for matrices will not be supported, just as MathJax won't either.
  • aligned and alignedat will have column spacings more similar to an ordinary equation. This should be an improvement to KaTeX and MathJax.
  • \genfrac's delimiters will have a larger spacing with inner node. (This might be fixed in future)
  • \color commands inside a block will NOT be applied to right delimiters. This is in line with MathJax rather than KaTeX.
  • \colon's behavior will be in line with MathJax rather than KaTeX.
  • \mathop will no longer vertically center single characaters. MathJax doesn't do this either.
  • \cancel, \xcancel, \bcancel will render differently compared to KaTeX. The vertical padding will be more similar to MathJaX.
  • Due to the lack of \mathchoice, \pod, \pmod, \mod will have fixed spacing.
  • \dfrac, \tfrac ... will have slight size deviation from KaTeX and will be in line with MathJax's rendering behavior.
  • \sqrt will no longer underflow below the baseline when given a child whose height is too small (e.g. \sqrt{.}). This is also different from MathJaX.
  • The size of \sqrt symbol might be slightly different. Due to a different style choosing scheme.
  • There will be no automatic thinspace between \cdots and right delimiter, (which is odd. MathJax and Tex don't have them either)

Any other deviations from KaTeX will be considered as bug.