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https://github.com/Smaug123/KaTeX
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47 lines
2.6 KiB
Markdown
47 lines
2.6 KiB
Markdown
---
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id: font
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title: Font
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---
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By changing the variables in the `fonts.less` file at the [katex-fonts submodule](https://github.com/KaTeX/katex-fonts/),
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several properties of the way fonts are used can be changed.
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## Font size and lengths
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By default, KaTeX math is rendered in a 1.21× larger font than the surrounding
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context, which makes super- and subscripts easier to read. You can control
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this using CSS, for example, to set to 1.1×:
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```css
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.katex { font-size: 1.1em; }
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```
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KaTeX supports all TeX units, including absolute units like `cm` and `in`.
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Absolute units are currently scaled relative to the default TeX font size of
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10pt, so that `\kern1cm` produces the same results as `\kern2.845275em`.
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As a result, relative and absolute units are both uniformly scaled relative
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to LaTeX with a 10pt font; for example, the rectangle `\rule{1cm}{1em}` has
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the same aspect ratio in KaTeX as in LaTeX. However, because most browsers
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default to a larger font size, this typically means that a 1cm kern in KaTeX
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will appear larger than 1cm in browser units.
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## Kinds of fonts used
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KaTeX provides fonts in three different formats: `ttf`, `woff`, and `woff2`.
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- `ttf`s are included to support very old browsers and local installation. [Browser support](https://caniuse.com/#feat=ttf)
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- `woff` is the format that is most widely supported (all modern browsers support it), so it probably provides the most benefit to being included. [Browser support](https://caniuse.com/#feat=woff)
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- `woff2`s are included for modern browsers, because they are much smaller and faster to load. [Browser support](https://caniuse.com/#feat=woff2)
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KaTeX will automatically include only necessary fonts for target environments
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specified by [Browserslist config](https://github.com/browserslist/browserslist#queries).
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To force a font type to be included or excluded, set `USE_(FONT NAME)` environment
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variable to `"true"` or `"false"`, respectively.`
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## Location of font files
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The default build of KaTeX expects the KaTeX fonts to be located in a directory called `fonts` which is a sibling of the `katex.min.css` stylesheet. This can be changed as follows:
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1. At the top of the [fonts.less](https://github.com/KaTeX/katex-fonts/blob/master/fonts.less) file, set `@font-folder` to the location of your fonts. You can use relative or absolute paths, so setting it to `"/fonts"` would cause it to search for the fonts in a root `fonts` folder, while `"../fonts"` would search in a `fonts` directory one level above the `katex.min.css` file.
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2. Rebuild KaTeX by running `yarn build` from the top-level directory.
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3. Use the newly generated `dist/katex.min.css` file, and place the fonts where you indicated.
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