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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 26 - Try It (Browser)</title>
</head>
<body>
  <h1>Wrap pattern (document.write)</h1>
  <p>Edit the loops, then click Run.</p>

  <script>
    const A = 65;
    const top = 69;
    for (let i = A; i <= top; i++) {
      for (let j = i; j <= top; j++) document.write(String.fromCharCode(j));
      for (let k = i; k > A; k--) document.write(String.fromCharCode(k - 1));
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Alphabet Pattern 26 (Try It — Browser)