javascript-demo/EventListennerDemo1.html at master · SaiSriRohit143/javascript-demo · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
            .wrapper{
  position: relative;
  top: 40vh;
}
#button{
  border: 5px solid #FFAB33;
  width: 200px;
  text-align: center;
  padding: 10px;
  font-size: 30px;
  cursor: pointer;
  margin: auto;
  background: #FF5733;
}

#button:hover{
  background: #DFF30B;
}

#message{
  font-size: 26px;
  margin-bottom: 30px;
  text-align: center;
}

.hide{
  visibility: hidden;
}

.reveal{
  visibility: visible;
}

    </style>
</head>
<body>

 <div class="wrapper">
    <div id="message" class="hide">
      You won't see this message until after you clicked the button. Click again to hide me!
    </div>
    <div id="button">
      Click me!
    </div>
  </div>

  <script>
    let button = document.querySelector('#button'); //query selector method can work with any css selector , it is more flexible then getelementbyId method
    let msg = document.querySelector('#message');

    button.addEventListener('click', ()=>{
    msg.classList.toggle('reveal');})

</script>
</body>
</html>