Having same problem as below where the workspace is returning undefined variables. I have not tried other workspaces.

//Problem: user interaction doesn't provide desired results.
//Solution: Add interactivity so the user can manager daily tasks.
var taskInput = document.getElementById("new-task"); = //new-task
var addButton = document.getElementByTagName("button") [0]; = //first button
var incompleteTaskholder = document.getElementById("incomplete-tasks"); //incomplete-tasks
var completedTaskholder  = document.getElementById("completed-tasks"); //completed-tasks

//Add a new task
var addTask = function() {
  //When button is pressed, 
  //Create a new list item with the text from #new-task
    //input (checkbox)
    //Label
    //input (text)
    //button.edit
    //button.delete
    //each element needs to be modified and appended
}

//Edit an existing task
var editTask = function() {
  //If the parent has the class .editMode
    //switch from .editMode
    //Make lable text become input value
  //else
    //Switch to .editMode
    //input value becomes the label's text

  //Toggle .editMode
}

//Delete an existing task
var deleteTask = function() {
    //When delete button is pressed
    //Remove parent list item from the ul
}

//Mark a task as complete
var taskCompleted = function() {
    //When the checkbox is checked
      //Append the task list item to the #completed-tasks
}

//Mark a task as incomplete
var taskIncomplete = function() {
    //When the checkbox is unchecked
      //Append the task list item to the #incompleted-tasks