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Self-hosting subset fonts
Fonts are subset with the expectation that multiple font files will be used along with the CSS property unicode-range to specify unicodes present in each file. This enables a website browser to automatically download only the fonts needed to display text on a given site, and works in all modern browsers.
To support only "Latin Basic" characters, you can use just the latin_basic font file. To use "Latin Extended" characters, you should use both latin_basic and latin_ext font files (this makes sure basic punctuation isn’t left out). For Vietnamese, you must use latin_basic and vietnamese subsets at minimum, but may wish to also use latin_ext.
Files are provided along with example CSS to provide an example of how this works. Feel free to copy the fonts.css to jump-start your own projects!