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.
-o dac -d ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; nchnls = 1 ; ksmps = 32 0dbfs = 1 instr 1 ;will fail because of wrong code ires compilestr {{ instr 2 a1 oscilb p4, p5, 0 out a1 endin }} print ires ; returns -1 because not successfull ;will compile ... ires compilestr {{ instr 2 a1 oscils p4, p5, 0 out a1 endin }} print ires ; ... and returns 0 ;call the new instrument ;(note that the overall performance is extended) scoreline_i "i 2 0 3 .2 415" endin i1 0 1