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<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 14 - Try It</title>
</head>
<body>
  <h1>Step-by-two alphabet rows</h1>
  <p>Open the HTML code, tweak <code>start</code>, <code>outerEnd</code>, or <code>step</code>, then click Run.</p>

  <pre id="output"></pre>

  <script>
    (() => {
      const start = "A".charCodeAt(0);
      const outerEnd = "I".charCodeAt(0);
      const step = 2;

      let result = "";
      for (let i = start; i <= outerEnd; i += step) {
        let line = "";
        for (let j = start; j <= i; j++) {
          line += String.fromCharCode(j);
        }
        result += line + "\n";
      }

      document.getElementById("output").textContent = result;
    })();
  </script>
</body>
</html>

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JavaScript Alphabet Pattern 14 (Try It)