JavaScript - add transition between display:none and display:block

Question

I am using JavaScript to toggle notification like below. How can I add transition between display: block and display: none;

I don\'

Answer 1

see my example below:

var btn = document.querySelector('button');
var hint = document.getElementById('hint');
var height = hint.clientHeight;
var width = hint.clientWidth;
console.log(width + 'x' + height);
// initialize them (within hint.style)
hint.style.height = height + 'px';
hint.style.width = width + 'px';

btn.addEventListener('click', function(){
  if(hint.style.visibility == 'hidden'){
    hint.style.visibility = 'visible';
    //hint.style.opacity = '1';
    hint.style.height = height + 'px';
    hint.style.width = width + 'px';
    hint.style.padding = '.5em';
  }
  else{
    hint.style.visibility = 'hidden';
    //hint.style.opacity = '0';
    hint.style.height = '0';
    hint.style.width = '0';
    hint.style.padding = '0';
  }

});

div#hint{
  background: gold;
  color: orangered;
  padding: .5em;
  box-sizing: border-box;
  overflow: hidden;

  font-weight: bold;
  transition: height 1s, width 1s, padding 1s, visibility 1s, opacity 0.5s ease-out;
}

  
  
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