This should play if your Web browser has WebAssembly enabled (most do). Most examples will play unless they need to load files. The first time you click Play, Csound will spend a few seconds loading, then play. You can edit this code and replay it.
; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 instr 1 a1 diskin "fox.wav",1,0,1 k1 randh 80, 2.5 a2 vco2 8, 220+k1 fsig pvsanal a1,1024,256,1024,1 fsig2 pvsanal a2,1024,256,1024,1 keps[] pvsceps fsig,30 kenv[] cepsinv keps fenv tab2pvs r2c(kenv) fvoc pvsfilter fsig2, fenv, 1 asig pvsynth fvoc out asig endin i1 0 60