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HTML 

              
                <div class="microwave">
  <div class="door">
    <div class="glass"></div>
    <div class="handle"></div>
  </div>
  
  <div class="menu">
    <div class="screen">
      <span class="progress"></span>
    </div>
    <button class="start">Start</button>
    <button class="clear">Clear</button>
  </div>
  
  <div class="smoke">
    <span class="s0"></span>
    <span class="s1"></span>
    <span class="s2"></span>
    <span class="s3"></span>
    <span class="s4"></span>
    <span class="s5"></span>
    <span class="s6"></span>
    <span class="s7"></span>
    <span class="s8"></span>
    <span class="s9"></span>
  </div>
</div>
!

CSS 

              
                html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
}

body {
  background: linear-gradient(to right, #007991, #78ffd6); /* https://uigradients.com/#ChittyChittyBangBang */
}

.microwave {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  background: grey;
  width: 90vmin;
  height: 50vmin;
  transform: translate(-50%, -50%);
}

.microwave::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 4vmin;
  width: calc(100% - 8vmin);
  height: 75%;
  background: black;
  transform: translateY(-50%);
  border-radius: 2vmin;
}

.door {
  position: relative;
  flex: 0 0 75%;
  border-right: solid 3px white;
}

.handle {
  position: absolute;
  top: calc(5vmin - 1.5px);
  right: 3.5vmin;
  width: 4vmin;
  height: calc(100% - 10vmin);
  background: grey;
  border-radius: 2vmin;
  border: solid 3px white;
}

.glass {
  position: absolute;
  top: 50%;
  left: 8vmin;
  width: 70%;
  height: calc(70% - 5vmin);
  background-color: white;
  transform: translateY(-50%);
}

.running .glass {
  background-color: lightyellow;
}

.menu {
  flex: 0 0 25%;
  position: relative;
}

.start,
.clear {
  position: absolute;
  bottom: 17.5%;
  right: 4.5vmin;
  width: 80%;
  color: white;
  height: 5vmin;
  background: transparent;
  border: none;
  text-transform: uppercase;
  text-align: center;
  font-size: 3.5vmin;
}

.clear { 
  display: none; 
  color: red;
}

.running .start { display: none; }
.running .clear { display: block; }

.screen {
  position: absolute;
  top: 20%;
  right: 6.5vmin;
  width: 60%;
  height: 5vmin;
  background: white;
}

.progress {
  position: absolute;
  top: 3px;
  left: 3px;
  width: calc(100% - 6px);
  height: calc(100% - 6px);
  background: #78ffd6;
  transform-origin: 0 50%;
  transform: scaleX(0);
}

.running .progress {
  transform: scaleX(1);
  transition: transform 2s linear;
}

.smoke {
	position: absolute;
	width: 0; 
  height: 0;
	left: 37%; 
  top: 8.5vmin;
}

.smoke span { 
  display: block;
	position: absolute;
	bottom: -35px; left: 50%; margin-left:-20px;
	height: 0px; width: 0px;
	border: 35px solid #4b4b4b;
	border-radius: 35px;
	left: -14px; opacity: 0;
	transform: scale(0.2);
}

@keyframes fumeeG {
	0%   { transform: scale(0.2) translate(0, 0) }
	10%  { opacity: 1; transform: scale(0.2) translate(0, -5px) }
	100% { opacity: 0; transform: scale(1) translate(-20px, -130px) }
}

@keyframes fumeeD {
	0%   { transform: scale(0.2) translate(0, 0) }
	10%  { opacity: 1; transform: scale(0.2) translate(0, -5px) }
	100% { opacity: 0; transform: scale(1) translate(20px, -130px) }
}

.cancel .smoke .s0 { animation: fumeeG 10s 0s }
.cancel .smoke .s1 { animation: fumeeD 10s 1s }
.cancel .smoke .s2 { animation: fumeeG 10s 2s }
.cancel .smoke .s3 { animation: fumeeD 10s 3s }
.cancel .smoke .s4 { animation: fumeeG 10s 4s }
.cancel .smoke .s5 { animation: fumeeD 10s 5s }
.cancel .smoke .s6 { animation: fumeeG 10s 6s }
.cancel .smoke .s7 { animation: fumeeD 10s 7s }
.cancel .smoke .s8 { animation: fumeeG 10s 8s }
.cancel .smoke .s9 { animation: fumeeD 10s 9s }
!

JS 

              
                /*
Pour cet exercice, vous n'avez qu'à ajouter du JS (Nul besoin de modifier le HTML ou le CSS).

1. Lorsque la transition sur l'élément progrès débute, il faut déclencher le son 'marche'.
2. Lorsque la transition est terminée, retirer la classe 'en-marche' sur l'élément <body>, mettre le son 'marche' à pause et déclencher le son 'ding'.
3. Si l'usager appuie sur le bouton 'clear' pendant la transition, mettre le son 'marche à pause', retirer la classe 'en-marche' sur l'élément <body>. La transition sera ainsi cancellée. Écouter cet événement et si l'elapsedTime est inférieur à '2' (soit la durée de l'animation), ajouter la classe 'oups' au <body>.

Résultat attendu 👉 https://gph.is/g/apQVR2Q

Bonne chance
*/

const start = document.querySelector('.start');
var ding = new Audio('https://ex.smnarnold.com/animations-transitions/ding.mp3');
var marche = new Audio('https://ex.smnarnold.com/animations-transitions/mirco-onde.mp3');

start.addEventListener('click', function() {
  document.body.classList.add('running');
  document.body.classList.remove('cancel');
});
!
999px

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