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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 49 - Try It (Browser)</title>
</head>
<body>
  <h1>Triangular Multiplication Pattern (aligned cells)</h1>
  <p>Edit n and click Run.</p>

  <script>
    var n = 10;
    for (var i = 1; i <= n; i++) {
      for (var j = 1; j <= i; j++) {
        document.write('<span style="display:inline-block;width:3em;text-align:right">' + (i * j) + '</span>');
      }
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 49 (Try It — Browser)