<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>do-while</title>
</head>
<body>
<script>
function star(row = 5) {
let start = 0;
do {
let n = 0;
do {
document.write("*");
} while (++n <= start);
document.write(`<br>`);
} while (++start <= row);
}
star(20)
</script>
</body>
</html>