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## [0.13.1](https://github.com/KaTeX/KaTeX/compare/v0.13.0...v0.13.1) (2021-04-05) ### Bug Fixes * Protect fraction bars from CSS border-color ([#2870](https://github.com/KaTeX/KaTeX/issues/2870)) ([2f62c0d](2f62c0d8ee))
24 lines
1.4 KiB
Markdown
24 lines
1.4 KiB
Markdown
# mhchem extension
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This extension adds to KaTeX the `\ce` and `\pu` functions from the [mhchem](https://mhchem.github.io/MathJax-mhchem/) package.
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### Usage
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This extension isn't part of core KaTeX, so the script should be separately included. Write the following line into the HTML page's `<head>`. Place it *after* the line that calls `katex.js`, and if you make use of the [auto-render](https://katex.org/docs/autorender.html) extension, place it *before* the line that calls `auto-render.js`.
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```html
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<script defer src="https://cdn.jsdelivr.net/npm/katex@0.13.1/dist/contrib/mhchem.min.js" integrity="sha384-LIgAiYlGSAdpNC9+YDjDPF6JeS/RRIumtNo0CmyQERZ/+g0h9MbuYQwf/5pQ4Y4M" crossorigin="anonymous"></script>
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```
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If you remove the `defer` attribute from this tag, then you must also remove the `defer` attribute from the `<script src="https://../katex.min.js">` tag.
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### Syntax
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See the [mhchem Manual](https://mhchem.github.io/MathJax-mhchem/) for a full explanation of the input syntax, with working examples. The manual also includes a demonstration box.
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Note that old versions of `mhchem.sty` used `\cf` for chemical formula and `\ce` for chemical equations, but `\cf` has been deprecated in place of `\ce`. This extension supports only `\ce`. You can define a macro mapping `\cf` to `\ce` if needed.
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### Browser Support
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This extension has been tested on Chrome, Firefox, Opera, and Edge.
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