HTML Code

<!DOCTYPE html>
<html>
<body>
<script>
const rows = 5;
let out = "";

for (let i = 1; i <= rows; i++) {
  let line = "";
  for (let j = rows; j >= 1; j--) {
    if (j > i) {
      line += " ";
    } else {
      line += j;
    }
  }
  out += line + "\n";
}

document.write("<pre>" + out + "</pre>");
</script>
</body>
</html>

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JavaScript Number Pattern 30 (Try It)