Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

JavaScript

let audioCtx = new AudioContext();

let osc1 = audioCtx.createOscillator();
let osc2 = audioCtx.createOscillator();
let osc3 = audioCtx.createOscillator();

let masterGain = audioCtx.createGain();

osc1.frequency.value = 440;
osc2.frequency.value = 550;
osc3.frequency.value = 660;
masterGain.gain.value = 0.3;

osc1.connect(masterGain);
osc2.connect(masterGain);
osc3.connect(masterGain);
masterGain.connect(audioCtx.destination);

osc1.start();
osc2.start();
osc3.start();

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JSFiddle - React, Tailwind, and code Playground

JavaScript

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Use pre-released features

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