HTML Code

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 15 - Try It (Browser)</title>
  <style>
    div.cell {
      display: inline-block;
      text-align: center;
      width: 13px;
    }
  </style>
</head>
<body>
  <h1>Mirror bowtie (document.write)</h1>
  <p>Edit the loops, then click Run.</p>

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

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JavaScript Alphabet Pattern 15 (Try It — Browser)