html

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="closer.js"></script>
</head>

<body>
  <input id="newtask" />
  <button id="addtask">ADD</button>
  <ul id="todolist"></ul>
</body>

</html>