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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 19 - Try It (Custom Fill)</title>
</head>
<body>
  <h1>Fill-with-n Triangle (Custom Fill)</h1>
  <p>Edit <code>n</code> and <code>fill</code>, then click Run.</p>
  <pre id="output"></pre>
  <script>
    const n = 5;
    const fill = 9;
    let result = "";
    for (let i = n; i >= 1; i--) {
      let line = "";
      for (let j = i; j <= n; j++) {
        line += j + " ";
      }
      for (let j = 1; j < i; j++) {
        line += fill + " ";
      }
      result += line + "\n";
    }
    document.getElementById("output").textContent = result;
  </script>
</body>
</html>

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JavaScript Number Pattern 19 (Try It — Custom Fill)