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> --nosound </CsOptions> <CsInstruments> ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; This is the example file for ftexists /* ftexists Returns 1 if a given table index refers to an existing ftable iexists ftexists ifn kexists ftexists kfn Args: ifn / kfn: the table index to query Returns: iexists / kexists: 1 if a table with index ifn exists, 0 otherwise */ gifn1 ftgen 0, 0, 8, 2, 0 instr 1 iexists1 ftexists gifn1 print iexists1 iexists2 ftexists 2 print iexists2 kexists ftexists 3 printf "table 3 exists at time %f", kexists, timeinsts() endin </CsInstruments> <CsScore> f 2 0 8 2 0 f 3 1.5 8 2 0 i 1 0 2 </CsScore> </CsoundSynthesizer>