HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>matches filter</title>
</head>
<body>
  <button>Save</button>
  <button disabled>Submit</button>
  <button>Cancel</button>
  <button type="button" id="btn">Filter enabled</button>
  <pre id="out">—</pre>
  <script>
    document.getElementById("btn").onclick = function () {
      var enabled = [];
      var buttons = document.querySelectorAll("button");
      for (var i = 0; i < buttons.length; i++) {
        var b = buttons[i];
        if (b.matches("button:not([disabled])") && b.id !== "btn") {
          enabled.push(b.textContent);
        }
      }
      document.getElementById("out").textContent = enabled.join(", ");
    };
  </script>
</body>
</html>

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Element.matches — filter buttons (Try It)