Web Speech API

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window.addEventListener('load', () => {
    let synth, voice;

    const speak = text => {
        if (!synth || synth.speaking) return;
        const utterance = new SpeechSynthesisUtterance(text);
        utterance.addEventListener('error', error => console.error(error));
        utterance.voice = voice;
        synth.speak(utterance);
    };

    if ('speechSynthesis' in window) {
        synth = window.speechSynthesis;
        const voices = synth.getVoices();
        voice = voices.find(v => v.name === 'Alex');
    }

    const button = document.getElementById('speakButton');
    const demo = () => speak('Hello world');
    button.addEventListener('click', demo);
});