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              <body onload='document.getElementsByTagName("input")[0].focus()'>
  <h1>A VERY NICE TO DO LIST</h1>
  <div id=content>
    <div>
      <input type='text' placeholder='Click + or press Enter.' onkeydown='if (event.keyCode === 13) {addTask(undoneTasks)}'>
      <div id=buttons>
        <button title='Add the task to your To Do list.' class='change' type='button' onclick='addTask(undoneTasks)'>+</button>
        <button title='Remove the last task from your To Do list.' class='change' type='button' onclick='removeLastTask(undoneTasks)'>-</button>
        <button title='Delete all tasks from your To Do list.' id='clear' type='button' onclick='undoneTasks=[];doneTasks=[];refresh(undoneTasks,doneTasks)'>clear</button>
      </div>
    </div>
    <h2>Your things to do</h2> <output title='done/undone' id='out'> 0/0:</output>
    <ul id='tasks'></ul>
    <h4>v3.0</h4>
    <h3>created by <a href="http://balazsorban.com">balázs orbán</a></h3>
  </div>
  <script type='text/javascript' src='todo.js' async></script>
</body>
            
          
!
            
              body,
button {
  background: #333
}

.change,
button,
h1,
h3,
h3 a {
  color: gold
}

#content,
h1,
h3,
ul li {
  position: relative
}

h3 a,
ul li,
ul li span {
  transition: .3s ease-in-out
}

h1,
h3 {
  z-index: 1
}

body {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  width: 100vw
}

*,
h3,
h3 a {
  color: #333
}

* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  font-weight: bolder;
  font-size: 1em;
  border: none;
  outline: 0
}

#content {
  min-width: 200px;
  min-height: 114px;
  padding: 20px;
  border-radius: 10px;
  background-color: gold;
  border: 5px solid #daa520;
  border-bottom: 10px solid #daa520;
  box-shadow: 0 0 4px 4px rgba(0, 0, 0, .2)
}

h1 {
  font-size: 1.3em;
  margin: 5% 0 0 -2em
}

h2 {
  font-size: 1.1em;
  text-decoration: underline;
  display: inline
}

h2:after {
  font-size: .8em
}

h3,
h4 {
  font-size: .5em;
  bottom: -1.1em;
  position: absolute
}

h3 {
  padding: 0 5px;
  right: 0
}

h3 a {
  text-decoration: none
}

h3 a:hover {
  color: #fff
}

h4 {
  left: 0;
  padding: 0 8px
}

input[type=text] {
  padding: 10px;
  margin: 0 10px 20px 0;
  min-width: 240px;
  border-radius: 5px;
  border: 1px solid #333;
  box-shadow: inset 0 0 3px rgba(0, 0, 0, .3)
}

#buttons {
  position: absolute;
  top: 5px;
  right: -24px;
  display: flex;
  flex-direction: column;
  align-items: center
}

button {
  border-radius: 50%;
  padding: 15px;
  margin-top: 5px;
  border: 3px solid #daa520;
  width: 48px;
  height: 48px;
  cursor: pointer;
  font-size: 1.5em;
  line-height: 0;
  transition: .4s ease-in-out
}

button:hover {
  color: #daa520;
  background: #fff
}

.change {
  display: flex;
  justify-content: center;
  width: 24px;
  height: 24px;
  font-size: 1em;
  padding: 15px
}

#clear {
  font-size: .6em;
  line-height: normal;
  vertical-align: top;
  padding-left: 10px
}

#clear:hover {
  transform: none
}

ul {
  margin-top: 10px
}

ul li {
  max-width: 90%;
  list-style-type: none;
  padding: 5px;
  align-self: flex-start;
  border-bottom: 1px solid #daa520
}

ul li:hover {
  background-color: rgba(255, 255, 255, .3);
  cursor: pointer
}

ul li input {
  margin: 0 5px
}

ul li span {
  position: absolute;
  right: 0;
  padding-right: 5px
}

ul li span:hover {
  transform: scale(1.2);
  transform-origin: center
}

ul li span:after {
  content: '✕';
  color: #daa520
}

            
          
!
            
              undoneTasks = [];
doneTasks = [];
var inputArea = document.getElementsByTagName('input')[0];
var tasks = document.getElementById("tasks");

/*------------------------------------This function renders the done and undone undoneTasks.----------------------------------*/
function refresh(array1, array2) {

  /*-----Sorting the undone undoneTasks.---*/
  array1.sort(function(a, b) {
    return parseFloat(parseFloat(b.timestamp) - a.timestamp);
  });

  /*-----Emptying the unordered tasks to avoid duplicates in the next step.---*/
  while (tasks.firstChild) {
    tasks.removeChild(tasks.firstChild);
  }

  /*------This loop puts the newly added undoneTasks to the unordered tasks.------------*/
  for (i = 0; i < array1.length; i += 1) {
    var task = document.createElement("li");
    task.setAttribute("onclick", "checkCheckBox()")
    task.setAttribute("title", "Click to check this task.");

    var checkBox = document.createElement("input");
    var removeTask = document.createElement("span");
    removeTask.setAttribute("title", "Remove this task from the list.");
    removeTask.setAttribute("onclick", "removeTask()")
    checkBox.setAttribute("type", "checkbox");
    task.appendChild(checkBox);
    task.appendChild(document.createTextNode(array1[i].task));
    task.appendChild(removeTask);
    task.id = array1[i].timestamp;
    tasks.appendChild(task);
  }
  /*-----This loop puts the checked undoneTasks at the bottom of the unordered tasks.---*/
  for (i = 0; i < array2.length; i += 1) {
    var task = document.createElement("li");
    task.setAttribute("onclick", "unCheckCheckBox()");
    task.setAttribute("title", "Click to uncheck this task.");
    var checkBox = document.createElement("input");
    checkBox.setAttribute("type", "checkBox");
    checkBox.checked = true;
    task.appendChild(checkBox);
    task.appendChild(document.createTextNode(array2[i].task));
    task.id = array2[i].timestamp;
    task.style.textDecoration = "line-through";
    tasks.appendChild(task);
  }

  /*-----------------------Writing out the done/all undoneTasks.------------------------*/
  document.getElementById("out").value = doneTasks.length + "/" + (undoneTasks.length + doneTasks.length) + ":"

  /*-----Revert to the main input field.---*/
  inputArea.value = "";

}

/*-----------------------Add a new task to the the undone array as an object. ------------------------*/
function addTask(array) {

  /*-----If statement to avoid empty undoneTasks.---*/
  if (inputArea.value != "") {
    undoneTasks.unshift({
      timestamp: new Date().getTime(),
      task: inputArea.value
    });

    /*-----Run tasks rendering.---*/
    refresh(array, doneTasks);
    inputArea.placeholder = "Click + or press Enter.";
  }

  /*-----Asks the user to do not make empty undoneTasks.---*/
  else {
    inputArea.placeholder = "Write something...";
  }
}

function removeLastTask(array) {
  array = array.splice(0, 1)
  refresh(undoneTasks, doneTasks);
}

function removeTask() {
  var task = event.target.parentNode
  for (i = 0; i < undoneTasks.length; i += 1) {
    if (task.id == undoneTasks[i].timestamp) {
      undoneTasks.splice(i, 1)
    }
  }

  /*-----Run tasks rendering.---*/
  refresh(undoneTasks, doneTasks)
}

/*-----------------------Move checked element into the done array.------------------------*/
function checkCheckBox() {
  if (event.target.tagName == "INPUT") {
    var task = event.target.parentNode
  } else if (event.target.tagName == "LI") {
    var task = event.target
  } else {
    return
  }
  doneTasks.unshift({
    timestamp: parseInt(task.id),
    task: task.innerText
  });
  for (i = 0; i < undoneTasks.length; i += 1) {
    if (task.id == undoneTasks[i].timestamp) {
      undoneTasks.splice(i, 1)
    }
  }

  /*-----Run tasks rendering.---*/
  refresh(undoneTasks, doneTasks)
}

/*-----------------------Move unchecked element back to the undone array.------------------------*/
function unCheckCheckBox() {
  if (event.target.tagName === "INPUT") {
    var task = event.target.parentNode
  } else {
    var task = event.target
  }
  undoneTasks.unshift({
    timestamp: parseInt(task.id),
    task: task.innerText
  });
  for (i = 0; i < doneTasks.length; i += 1) {
    if (task.id == doneTasks[i].timestamp) {
      doneTasks.splice(i, 1)
    }
  }

  /*-----Run tasks rendering.---*/
  refresh(undoneTasks, doneTasks)
}

            
          
!
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