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<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 34 - Try It (Browser)</title>
</head>
<body>
  <h1>0-Based Sum Triangle (document.write)</h1>
  <p>Edit <code>maxRow</code>, then click Run.</p>

  <script>
    var maxRow = 5;
    for (var i = 0; i <= maxRow; i++) {
      for (var j = 0; j <= i; j++)
        document.write(i + j + " ");
      document.write("<br>");
    }
  </script>
</body>
</html>

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JavaScript Number Pattern 34 (Try It — Browser)