HTML Code

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 19 - Try It (Browser)</title>
  <style>
    div.cell {
      display: inline-block;
      text-align: center;
      width: 13px;
    }
  </style>
</head>
<body>
  <h1>Mirror halves (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 = A; j <= top; j++) {
        if (j <= i) document.write("<div class=\"cell\">" + String.fromCharCode(j) + "</div>");
        else document.write("<div class=\"cell\"></div>");
      }
      for (let k = top; k >= A; k--) {
        if (k > i) document.write("<div class=\"cell\"></div>");
        else document.write("<div class=\"cell\">" + String.fromCharCode(k) + "</div>");
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Alphabet Pattern 19 (Try It — Browser)