gistfile1.js

document.getElementById("todo").addEventListener("keypress", function(event) {
  if (event.keyCode == 13) { 
    addToDo(); 
  }
});

function addToDo() {
  var newEl = document.createElement("li");
  var parentEl = document.getElementById("list");
  var firstEl = parentEl.firstChild;
  
  newEl.innerHTML = document.myform.todo.value;
  newEl.addEventListener("click", function() {
    removeToDo(parentEl, newEl); 
  });
  
  parentEl.insertBefore(newEl, firstEl);
};

function removeToDo(parentEl, newEl) {
  parentEl.removeChild(newEl);
};