title: ImplementationNotes

! CSS Handling

The [[original CSS from KaTeX|https://github.com/Khan/KaTeX/blob/master/static%2Ffonts.css]] includes a number of font definitions in this format:

```
@font-face {
    font-family: 'KaTeX_AMS';
    src: url('fonts/KaTeX_AMS-Regular.eot');
    src: url('fonts/KaTeX_AMS-Regular.eot?#iefix') format('embedded-opentype'),
         url('fonts/KaTeX_AMS-Regular.woff') format('woff'),
         url('fonts/KaTeX_AMS-Regular.ttf') format('truetype');
    font-weight: normal;
    font-style: normal;
}
```

These definitions are currently removed manually from [[$:/plugins/tiddlywiki/katex/katex.min.css]] so that they can be redefined as data URIs using TiddlyWiki's macro notation:

```
@font-face {
    font-family: 'KaTeX_AMS';
    src: url(<<datauri '$:/plugins/tiddlywiki/katex/fonts/KaTeX_AMS-Regular.woff'>>) format('woff');
    font-weight: normal;
    font-style: normal;
}
```

Note that the plugin currently only embeds the WOFF format fonts, which seems to be sufficient for most browsers.