HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>migrate to wheel</title>
  <style>
    #stage {
      height: 120px; border: 2px solid #333; overflow: auto;
      padding: 12px; user-select: none;
    }
  </style>
</head>
<body>
  <p>Modern browsers take the <code>wheel</code> branch.</p>
  <div id="stage">Scroll here<br>Line 2<br>Line 3<br>Line 4</div>
  <pre id="out">(waiting)</pre>
  <script>
    var stage = document.getElementById("stage");
    var out = document.getElementById("out");
    function onScrollGesture(event, source) {
      var dy = source === "wheel" ? event.deltaY : -event.wheelDelta;
      out.textContent = source + " dy≈" + dy;
    }
    if ("onwheel" in window) {
      stage.addEventListener("wheel", function (event) {
        onScrollGesture(event, "wheel");
      });
    } else {
      stage.addEventListener("mousewheel", function (event) {
        onScrollGesture(event, "mousewheel");
      });
    }
  </script>
</body>
</html>

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Element mousewheel — migrate to wheel (Try It)