Nothing works at ALL on my js. Firefox, Google, Edge

//Problem: User interaction doesn't provide desired results.
//Solution: Add interactivity so the user can manage daily tasks.

var taskInput = document.getElementById("new-task"); //new-task
var addButton = document.getElementsByTagName("button")[0]; //first button
var incompleteTasksHolder = document.getElementById("incomplete-tasks"); //inocmplete-tasks ul
var completedTasksHolder = document.getElementById("completed-tasks"); //Completedtasks

//New Task List Item
var createNewTaskElement = function(taskString) {
  var listItem = document.createElement("li");

  //input (checkbox)
  var checkBox = document.createElement("input"); //Checkbox
  //label
  var label = document.createElement("label");
  //input (text)
  var editInput = document.createElement("input"); //text
  //button.edit
  var editButton = document.createElement("button");
  //button.delete
  var deleteButton = document.createElement("button");

  //Each elements needs modifying
  checkBox.type = "checkbox";
  editInput.type = "text";

  editButton.innerHTML = "Edit";
  editButton.className = "edit";
  deleteButton.innerText= "Delete";
  deleteButton.className = "delete";

  label.innerText = taskString;

  //Each element needs appending
  listItem.appendChild(checkBox);
  listItem.appendChild(label);
  listItem.appendChild(editInput);
  listItem.appendChild(editButton);
  listItem.appendChild(deleteButton);

   return listItem;
}

//Add a new task
var addTask = function() {
  console.log("Add task...");
  //Create a a new list item with the text from #new-task:
  var listItem = createNewTaskElement(taskInput.value);

  //Append listItem to incompleteTasksHolder
  incompleteTasksHolder.appendChild(listItem);
   bindTaskEvents(listItem, taskCompleted);
}

//Edit an existing task
var editTask = function() {
  console.log("Edit task...");
  //When the Edit button is pressed

  var listItem = this.parentNode;

  //Error: bad querySelector.  "input(type=text)" should be "input[type=text]" ********************
  var editInput = listItem.querySelector("input[type=text]");
  var label = listItem.querySelector("label");

  //Toggle .editMode on the parent
  listItem.classList.toggle("editMode"); 
  var containsClass = listItem.classList.contains("editMode");

  //if the class of the parent is in .editMode
  if(containsClass) {
    //Switch from .editMode
    //label text become the input's value
    label.innerText = editInput.value;
  } 
  else {
    //Switch to .editMode
    //input value becomes the label's text
    editInput.value = label.innerText;
  }//missing closing bracket *****************

}

//Delete an existing task
var deleteTask = function() { 
  console.log("Delete task...");
  var listItem = this.parentNode;
  var ul = listItem.parentNode;

  //Remove the parent list item from the ul
  ul.removeChild(listItem);
}

//Mark a task as complete
var taskCompleted = function() {
    console.log("Task complete...");
    //Append the task list item to the #completed-tasks
    var listItem = this.parentNode;
    completedTasksHolder.appendChild(listItem);
    //typo. taskInComplete should be taskIncomplete *******************
    bindTaskEvents(listItem, taskIncomplete);
}

//Mark a task as incomplete
var taskIncomplete = function() {
  console.log("Task incomplete...");
  //Append the task list item to the #incompleted-tasks
  var listItem = this.parentNode;
  incompleteTasksHolder.appendChild(listItem);
  bindTaskEvents(listItem, taskCompleted);
}

var bindTaskEvents = function(taskListItem, checkBoxEventHandler) {
  console.log("Bind list item events");//missing semicolon *************
  //select taskListItem's children
  var checkBox = taskListItem.querySelector("input[type='checkbox']");
  var editButton = taskListItem.querySelector("button.edit");
  var deleteButton = taskListItem.querySelector("button.delete");

  //bind the editTask to edit button
  editButton.onclick = editTask;

  //bind deleteTask to delete button
  deleteButton.onclick = deleteTask;

  //bind taskCompleted to checkbox
  checkBox.onchange = checkBoxEventHandler; 
}

//Set the click handler to the addTask Function
addButton.onclick = addTask;

//cycle over incompleteTasksHolder ul list items
for(var i = 0; i < incompleteTasksHolder.children.length; i +=1) {

  //bind events to list items's childeren (taskCompleted)
  bindTaskEvents(incompleteTasksHolder.children[i], taskCompleted);

}

//cycle over completeTasksHolder ul list items
//missing D. Typo. completeTasksHolder should be completedTasksHolder *********************
for(var i = 0; i < completedTasksHolder.children.length; i +=1) {
  //bind events to list items's childeren (taskIncomplete)
  bindTaskEvents(completedTasksHolder.children[i], taskIncomplete);
}