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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>substring vs slice</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var text = "Mozilla";
    document.getElementById("out").textContent = [
      text.substring(5, 2),
      JSON.stringify(text.slice(5, 2)),
      text.substring(-5, 2),
      JSON.stringify(text.substring(-5, -2)),
      text.slice(-5, -2)
    ].join("\n");
  </script>
</body>
</html>

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String.substring() — vs slice (Try It)