<script>
  window.addEventListener('load', init);

  function init(){
    let b = document.querySelector('button');
    b.addEventListener('click', readIntro);
  }

  function readIntro(event){
    let paragraphs = document.querySelectorAll('p');
    for(let p of paragraphs){
      let msg = new SpeechSynthesisUtterance(p.innerText);
      window.speechSynthesis.speak(msg);
    }
  }
</script>
<button>Read</button>