HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ctrlKey — branch</title>
</head>
<body>
  <button id="link" type="button">Click me (try Ctrl or ⌘)</button>
  <pre id="out"></pre>
  <script>
    document.getElementById("link").addEventListener("click", function (e) {
      document.getElementById("out").textContent =
        e.ctrlKey || e.metaKey
          ? "modifier+click — open related view"
          : "Normal click — default action";
    });
  </script>
</body>
</html>

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MouseEvent.ctrlKey — Ctrl/Command+click (Try It)