HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>wheel deltas</title>
  <style>
    #pad {
      width: 280px;
      height: 120px;
      border: 2px dashed #059669;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #ecfdf5;
      user-select: none;
    }
  </style>
</head>
<body>
  <div id="pad">Try vertical and horizontal wheel</div>
  <pre id="out">Waiting...</pre>
  <script>
    var pad = document.getElementById("pad");
    var out = document.getElementById("out");
    var modes = ["PIXEL", "LINE", "PAGE"];
    pad.addEventListener("wheel", function (event) {
      out.textContent =
        "dx=" + event.deltaX.toFixed(1) +
        " dy=" + event.deltaY.toFixed(1) +
        " mode=" + (modes[event.deltaMode] || event.deltaMode);
    }, { passive: true });
  </script>
</body>
</html>

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Element wheel — deltas (Try It)