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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 28 - Try It (Browser)</title>
</head>
<body>
  <h1>Symmetric Number Pattern (document.write)</h1>
  <p>Edit the loop limits, then click Run.</p>

  <script>
    var i, j, k;
    for (i = 10; i >= 1; i--) {
      for (j = i; j < 10; j++)
        document.write(j);
      document.write("0");
      for (k = 9; k >= i; k--)
        document.write(k);
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 28 (Try It — Browser)