HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>auxclick defaults</title>
  <style>
    button {
      border: 0;
      background: #fff;
      font-size: 1.4rem;
      padding: 1.5rem 2rem;
      letter-spacing: 0.08em;
    }
  </style>
</head>
<body>
  <button id="btn" type="button">Click me!</button>
  <pre id="out">Left = background, middle/right = text color</pre>
  <script>
    var button = document.getElementById("btn");
    var out = document.getElementById("out");
    function random(number) {
      return Math.floor(Math.random() * number);
    }
    function randomColor() {
      return "rgb(" + random(255) + " " + random(255) + " " + random(255) + ")";
    }
    button.onclick = function () {
      button.style.backgroundColor = randomColor();
      out.textContent = "Left-click: background color changes";
    };
    button.onauxclick = function (e) {
      e.preventDefault();
      button.style.color = randomColor();
      out.textContent = "Non-primary click: text color changes (menu suppressed)";
    };
    button.oncontextmenu = function (e) {
      e.preventDefault();
    };
  </script>
</body>
</html>

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Element auxclick — preventDefault (Try It)