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<!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>
</head>
<style>
    *{
        margin:0;
        padding:0;
    }
    #container{
        width:100vw;
        height:100vh;
        background-color: bisque;
        display: flex;
        justify-content: start;
        gap:5px;
        flex-wrap: wrap;
    }
    .box{
        height:100px;
        width:100px;
        background-color: blue;
        font-size: 2rem;
        font-weight: bold;
        display: flex;
        align-items: center;
        justify-content: center;
    }
</style>
<body>
    <button onclick="tambahKotak()">TAMBAH KOTAK</button>
    <div id="container">
    </div>
</body>
<script>
    let container = document.querySelector("#container");
    //on the fly, nambahno element secara runtime
    let arr = [];
    // arr.splice -> buat ngilangin array index ke ... sebanyak ...
    function tambahKotak(){
        let kotak = document.createElement("div");
        kotak.className = "box";
        kotak.innerText = arr.length+1;
        arr.push(kotak);
        container.append(kotak); 
    }
</script>
</html>