1@README.md
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3- **No host vocabulary.** Nothing here may name a product, a character, a picture format or a runtime. A host's
4  characters are its own `MouthSpec` values; the tests use specs of their own for that reason.
5- **Rectangles in the host's grid units, nothing drawn.** No I/O, no clock, no dependencies: it must build for wasm
6  and be readable from any shell.
7- **A new style is a variant of `Style`** with its shapes for all four levels in `rects`, an exhaustive match: a
8  style cannot be added without drawing every level.
9- **The syllable timing is a pure function over what the host has read** (the vowel, whether a hop to the next
10  syllable is under way, how far through the gap it is). Reading the text is the host's.