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 ; Audio out Audio in Silent MIDI in -odac -d </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 64 ; nchnls = 2 0dbfs = 1 instr 1 aenv linsegr 0, 0.1, 1, 0.1, 0 asig = oscili(0.1, 1000) asig += oscili(0.1, 1012) asig *= aenv if lastcycle() == 1 then schedulek p1, 0, p3 endif outs asig, asig endin </CsInstruments> <CsScore> i 1 0 0.5 f 0 3600 </CsScore> </CsoundSynthesizer>