>>amai+AJ1
TrueType fonts have had a Turing complete virtual machine (almost?) since the beginning. It is used for "hinting" to allow partially colored pixels at low resolutions to remain legible. It's basically a program that decides whether to color a pixel or not to allow fine tuning of low resolution rasterization.
This isn't used as much today with modern large resolutions where we can get decent image quality from just rasterizing the font outline with anti aliasing.
This example, however, is using wasm embedded to ttf fonts which is not the same as ttf hinting byte code.