<header>
<h1>Multiply table</h1>
</header>
<body>
<script>
arr = [];
for (let i = 1; i <= 5; i++) {
arr[i] = [];
for (let j = 1; j <= 5; j++) {
arr[i][j] = i * j;
}
}
let str = "";
for (let i = 1; i <= 5; i++) {
for (let j = 1; j <= 5; j++) {
val = arr[i][j];
str += ' ' + val.toString().padStart(2, ' ');
}
str += '\n'
}
alert(str);
</script>
</body>