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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.


              <div class="mask">Chargement en cours…</div>
  <div class="ui">
    Quelle est la réponse à La grande question sur la vie, l'univers et le reste ?
  <div class="reponse"></div>
  <div class="logger"></div>


              *{box-sizing: border-box;}

html, body, main {
  width : 100%;
  height: 100%;
  background-color: #222222;
  color: #FFFFFF;
  margin: 0;
  padding: 0;

main {
    background-image: url(;

.mask {
  position: absolute;
  left: 0px;
  top: 0px;
  right: 0px;
  bottom: 0px;
  background-color: #000;
  opacity: 0.9;
  visibility: hidden;
  display: flex;
  justify-content: center;
  align-self: center;
  text-align: center;
  flex-direction: column;
  font-size: 24px;

main {
  display: flex;
  justify-content: center;

.ui {
  width: 50%;
  max-width: 50%;
  display: flex;
  align-items: center;
  padding-top: 0.5rem;
  flex-direction: column;
  flex-grow: 1;

.ui button {
  flex-grow: 0;
  max-width: 300px;
  font-size: 20px;
  padding: 1em;
  color: white;
  margin-top: 0.5rem;

button {
      background: #3498db;
  background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
  background-image: -moz-linear-gradient(top, #3498db, #2980b9);
  background-image: -ms-linear-gradient(top, #3498db, #2980b9);
  background-image: -o-linear-gradient(top, #3498db, #2980b9);
  background-image: linear-gradient(to bottom, #3498db, #2980b9);
  border-radius: 4px;
  text-decoration: none;

button[disabled] {
    opacity: 0.5;

.reponse {
  margin: 0.5rem 0.5rem 0 0.5rem;
  font-size: 2.5rem;
  display: flex;
  width: 90%;
  height: 200px;
  border: 4px solid  #693900;
  flex-direction: column;
  text-align: center;
  justify-content: center;
  background-color: #F5CFA2;
  color : #693900;

.error {
  background-color: #FF4949;
  font-weight: bold;
  color: #6F0000;

.logger {
  flex-grow: 1;
  font-family: sans;
  font-weight: bold;
  width: 50%;
  max-width: 50%;

.logger span {
  display: block;
  margin: 0.5rem;
  background-color: rgba(0,0,0,0.9);
  border: 1px solid rgba(255,255,255,0.5);
  padding: 0.5rem;


              var logger = document.querySelector('.logger');
function log(message){
  var span = document.createElement('span');
  var date = new Date()
  var dateStr = date.getHours()+":"+date.getMinutes()+":"+date.getSeconds()+" "+date.getMilliseconds();
  span.innerHTML = dateStr + " - " + message;

//Définition de la fonction asynchrone
//Définition de la fonction asynchrone
function get_reponse(callback, failureCallback) {
  //On simule un appel ajax qui prend au plus 2 secondes
  setTimeout(function () {
      log("réponse récuperée");
  }, Math.random() * 2000);

var button = document.querySelector('button');
var reponseDiv = document.querySelector('.reponse');

//Lors du clic sur le bouton
button.addEventListener('click', function(){
  //On indique à l'utilisateur que le calcul est en cours
  reponseDiv.innerHTML = 'Calcul en cours…';
  //On désactive le bouton pour empecher de lancer N traitements
  button.disabled = true;
    //Et on lance la fonction pour obtenir notre réponse en passant une fonction qui sera appelé avec la valeur de la réponse
  get_reponse(function (reponse) {
    log("affichage réponse");
    //On affiche alors notre réponse
    reponseDiv.innerHTML = reponse;
    //Et on réactive le bouton
    button.disabled = false;