1@README.md
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3- A font file is replaced only by another subset of the same face with the same name; the
4  stylesheet's `@font-face` and `asset::FONTS` name the paths, and a test holds them together.
5- The stylesheet may not contain a `://` address or an `@import` (tested).
6- Datastar is not here: a site serves `aldebaran_datastar::SCRIPT` at `shell::DATASTAR_PATH`.
7- `pixel-emoji.woff2` holds exactly the codepoints of `components::PixelEmoji` and of the `unicode-range` in `ui.css`; add one in `build-pixel-emoji.py`, the enum and the range together (a test holds the last two).