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.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out and realtime midi in </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 giengine fluidEngine isfnum fluidLoad "sf_GMbank.sf2", giengine, 1 instr 1 iCnt init 0 SSoundFontPrograms[] fluidInfo giengine iNumberOfPrograms lenarray SSoundFontPrograms until iCnt>=iNumberOfPrograms do printf_i "%s\n", 1, SSoundFontPrograms[iCnt] iCnt = iCnt+1 od endin </CsInstruments> <CsScore> i1 0 1 </CsScore> </CsoundSynthesizer>