istos
fbb3446009
Committing the woff2 files is redistribution, and OFL 1.1 asks that its text and copyright notice travel with the font. IBMPlex.LICENSE.txt from IBM/plex, ZillaSlab.LICENSE.txt from mozilla/zilla-slab; both ship in dist/static/fonts/ with the faces they cover.
The site's fonts live here
Reading bench's documentation must not require a request to anyone else,
so the site links no font CDN. site/static/site.css declares its faces
against files in this directory, and everything the built pages fetch is
same-origin.
Seven files, exactly these names — they are what the @font-face rules
in site.css ask for:
| File | Family | Weight | Style |
|---|---|---|---|
IBMPlexSans-Regular.woff2 |
IBM Plex Sans | 400 | normal |
IBMPlexSans-Italic.woff2 |
IBM Plex Sans | 400 | italic |
IBMPlexSans-Medium.woff2 |
IBM Plex Sans | 500 | normal |
IBMPlexSans-SemiBold.woff2 |
IBM Plex Sans | 600 | normal |
IBMPlexMono-Regular.woff2 |
IBM Plex Mono | 400 | normal |
IBMPlexMono-Medium.woff2 |
IBM Plex Mono | 500 | normal |
ZillaSlab-SemiBold.woff2 |
Zilla Slab | 600 | normal |
Where they come from
The seven files are committed, so a clean checkout builds the real typography with no network and a deploy is the same bytes from any machine. Run the script only to refresh them or to add a face:
python3 site/fetch-fonts.py
It asks Google Fonts for the CSS these faces would need, reads the
woff2 URLs out of the reply, and writes the files here under the names
above. What it downloads is already the latin subset Google serves —
the site's copy of the font, not a link to Google's. That request
happens once, on the machine that refreshes a face; nothing the site
serves ever makes it.
Both families are licensed for this: IBM Plex under the SIL Open Font License 1.1, Zilla Slab likewise. The licence's one obligation is that its text and copyright notice travel with the font, and committing the woff2 files here is redistribution — so they do:
| File | Covers | From |
|---|---|---|
IBMPlex.LICENSE.txt |
the six Plex faces | IBM/plex |
ZillaSlab.LICENSE.txt |
ZillaSlab-SemiBold |
mozilla/zilla-slab |
fetch-fonts.py does not fetch these — it asks the Google Fonts CSS
API, which serves the woff2 and nothing else. Adding a family means
adding its licence here by hand.
If they are absent
site/build.py prints a warning: line naming every file the
stylesheet wants and the build does not have, and carries on. The pages
render on the fallback stack (system-ui, ui-monospace, Georgia)
and still make no third-party request — the typography is wrong, the
privacy promise is not.