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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 15 - Try It</title>
</head>
<body>
  <h1>Mirror bowtie (console)</h1>
  <p>Edit <code>A</code>, <code>top</code>, or loops, then click Run.</p>

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

  <script>
    (() => {
      const A = "A".charCodeAt(0);
      const top = "E".charCodeAt(0);

      let result = "";
      for (let i = top; i >= A; i--) {
        let line = "";
        for (let j = A; j <= i; j++) line += String.fromCharCode(j);
        for (let k = i; k < top; k++) line += "**";
        for (let m = i; m >= A; m--) line += String.fromCharCode(m);
        result += line + "\n";
      }

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

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JavaScript Alphabet Pattern 15 (Try It)