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<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 19 - Try It</title>
</head>
<body>
  <h1>Mirrored halves with spaces</h1>
  <p>Edit the loops or change <code>top</code>, then click Run.</p>

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

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

      let result = "";
      for (let i = A; i <= top; i++) {
        let left = "";
        for (let j = A; j <= top; j++) left += j <= i ? String.fromCharCode(j) : " ";

        let right = "";
        for (let k = top; k >= A; k--) right += k > i ? " " : String.fromCharCode(k);

        result += left + right + "\n";
      }

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

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JavaScript Alphabet Pattern 19 (Try It)