Not to disagree, but WebAssembly intentionally does contain two equivalent descriptions (prose vs. mathematical) and two different formats (binary vs. text), plus a completely independent redefinition of IEEE 754 (!). The true size would be more like around 100 pages, where the instruction definitions would take about a half of them if my prediction from the table of contents is close enough. Maybe highly desugarable "WebAssembly Zero" might be defined and would be a good fit once SpecTec can produce a working modular interpreter.

I think Bedrock's choice of not having floating point at all is a good example of the divergence in design goals.

That said, I don't see a completely independent redefinition of IEEE 754 in the 226-page https://webassembly.github.io/spec/core/_download/WebAssembl.... In §4.3.3 it does restrict IEEE 754, for example requiring a particular rounding mode, and it defines NaN propagation details that the IEEE 754 spec leaves open-ended IIRC, and it does define some things redundantly to IEEE 754, such as addition and square roots and so on. But it doesn't, for example, describe the binary representation of floating-point numbers at all, even though they can be stored in linear memory and in modules (it just refers you to the IEEE spec), nor permit decimal floating point. §4.3.3 only runs from p. 74 to p. 87, so it would be hard for it to independently define all of IEEE 754.