Добрый день, или вечер!
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<input id="in">
<button id="but">add</button>
<hr>
<script src="todo.js"></script>
<link rel="stylesheet" type="text/css" href="todo.css">
<body>
</body>
</html>
var input=document.getElementById("in");
var button=document.getElementById("but");
button.onclick=()=>{
var s=document.body.append(input.value);
localStorage.setItem('input.value',input.value);
}
var storage=localStorage.getItem('input.value');
document.body.append(` ${storage}`);
