1@README.md
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3- **Stay on the 8 by 8 face.** A real font means a font engine and a font
4  file in the Worker, and a Worker on the free plan gets 10 ms of CPU.
5- **`WIDTH` and `HEIGHT` are also the `og:image` size the page declares.**
6- **A letter the face lacks is drawn as `?`.** It has ASCII and Latin-1.