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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 17 - Try It</title>
</head>
<body>
  <h1>Diagonal star grid</h1>
  <p>Edit the loops or swap <code>*</code> for another character, then 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 line = "";
        for (let j = top; j >= A; j--) {
          line += i === j ? "*" : String.fromCharCode(j);
        }
        result += line + "\n";
      }

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

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JavaScript Alphabet Pattern 17 (Try It)