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.
; Select audio/midi flags here according to platform -M0 -Q1 ;;;midi in and midi out ; Required settings for WebAudio: sr = 48000 ksmps = 128 nchnls = 2 nchnls_i = 1 ; sr = 44100 ; ksmps = 32 ; nchnls = 2 0dbfs = 1 instr 1 kcps line 3, p3, .1 klf lfo 1, kcps, 3 ;use a unipolar square to trigger ktr trigger klf, 1, 1 ;from 3 times to .1 time per sec. midion2 1, 60, 100, ktr endin i 1 0 20 e