JavaScript Add Item na lista

<!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">
    <style>
        ul li{
            list-style: none;
            border-style:groove;
            border-radius: 40px;
            }
        ul li:hover{
            background-color: red;
            }
        </style>
</head>
<body> 
<div class="container">
        <div class="box">
            <h3>villes:</h3>
            <textarea id="text"></textarea>
            <br/>
            <button id="submit" onclick="submit()">Submit</button>
        </div>
        <div class="guestList">
            <div id="list"></div>
        </div>
    </div>
    <script>
    function submit(){
        var guestName=document.getElementById('text');
        var listData=guestName.value.split('\n');

        var listContainer=document.getElementById('list'),
        listElement=document.createElement("ul");
        listContainer.appendChild(listElement);

        var numberOfListItems=listData.length;
        var listItem;
        for(var i=0; i<numberOfListItems; ++i){
            listItem=document.createElement("li");
            listItem.innerHTML=listData[i];
            listElement.appendChild(listItem);
        }
    }
</script>
</body>
</html>
rd