If all you want to do is compile and run c code in the browser you could run tcc in the blink x86_64 emulator, running in wasm. It would take ~300Kb, less than

If all you want to do is compile and run c code in the browser you could run tcc in the blink x86_64 emulator, running in wasm. It would take ~300Kb, less than the js & css used in the average webpage