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KaTeX/docs/issues.md
ylemkimon 9917d1ce84 Add support for \expandafter, \noexpand, \edef, \let, and \long (#2122) 
* Add support for \expandafter

* Add support for \noexpand

* Add support for \edef

* Update comments

* Allow \long before macro definition

* Update documentation

* Update comments

* Fix defPrefix

* Add support for \let

* Update documentation

* Print error token

* Update documentation

* Check whether command is expandable

* Add tests

* Fix token order

* Make noexpand a Token property

* Throw error if control sequence is undefined when expanding

* Rename expandableOnly to expandOnly

* Make unexpandable macro property

* Move \expandafter to macros.js

* Add TODO

* Fix merge conflict

* Update a test case

* Remove unused functions in MacroContextInterface

* Update comments

* Refactor code

* Move \noexpand to macros

* Update MacroExpander.js

* Add a test case

* Separate control sequence check to a function

* Add support for \futurelet

* Separate RHS getter to a function

* Update documentation

* Move expandOnly logic to expandOnce

* Refactor code and update comments

Co-authored-by: Kevin Barabash <kevinb@khanacademy.org>
2020-03-11 12:14:34 +09:00

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id, title
id title
issues Common Issues
  • Be sure to include <!DOCTYPE html> at the top of your HTML file, as otherwise your browser will render in "quirks mode" which can cause KaTeX to sometimes render incorrectly. This header is needed even inside <iframe>s (which don't inherit the parent document's doctype).
  • Many Markdown preprocessors, such as the one that Jekyll and GitHub Pages use, have a "smart quotes" feature. This changes ' to ’ which is an issue for math containing primes, e.g. f'. This can be worked around by defining a single character macro which changes them back, e.g. {"’", "'"}.
  • KaTeX follows LaTeX's rendering of aligned and matrix environments unlike MathJax. When displaying fractions one above another in these vertical layouts there may not be enough space between rows for people who are used to MathJax's rendering. The distance between rows can be adjusted by using \\[0.1em] instead of the standard line separator distance.
  • KaTeX does not support the align environment because LaTeX doesn't support align in math mode. The aligned environment offers the same functionality but in math mode, so use that instead.
  • MathJax defines \color to be like \textcolor by default; set KaTeX's colorIsTextColor option to true for this behavior. KaTeX's default behavior matches MathJax with its color.js extension enabled.
  • Equivalents of MathJax \class, \cssId, and \style are \htmlClass, \htmlId, and \htmlStyle, respectively, to avoid ambiguity.
  • Some symbols are defined using macro instead of \DeclareMathSymbol or similar as in LaTeX. This may cause different behavior in expansion. They may expand into multiple tokens and be affected by \expandafter and \noexpand.

Troubleshooting

To check the stylesheet (katex.css) is properly loaded, add following code to anywhere in the document:

<style>
  .katex-version {display: none;}
  .katex-version::after {content:"0.10.2 or earlier";}
</style>
<span class="katex">
  <span class="katex-mathml">The KaTeX stylesheet is not loaded!</span>
  <span class="katex-version rule">KaTeX stylesheet version: </span>
</span>

If it is loaded properly, it'll show its version. Make sure its version matches the version of the JavaScript file (katex.js), which is defined in katex.version. If it is not loaded properly, it'll show:

The KaTeX stylesheet is not loaded!