html/pointerdown.html at master · bluemarvin/html · GitHub

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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
<style>
* {
    touch-action: none;
    touch-action: pinch-zoom;
}

#pane {
    width: 400px;
    height: 400px;
    overflow: hidden;
    position: relative;
}

#map {
    background-color: green;
    width: 150%;
    height: 150%;
    position: absolute;
    top: -25%;
    left: -25%;
    z-index: 1;
}

#box {
    background-color: red;
    width: 40%;
    height: 40%;
    position: absolute;
    top: 30%;
    left: 30%;
    z-index: 100;
}
</style>
<script>
function setup() {
//  document.body.addEventListener('pointerdown', function (event) {
  document.addEventListener('pointerdown', function (event) {
    let target = event.target.id || event.target.nodeName;
console.log("target = " + target);
    document.querySelector('pre').textContent = `target is ${target}`;
  });
}
</script>
</head>
<body onload="setup()">
  <div id="pane">
      <div id="box"></div>
      <div id="map"></div>
  </div>
  <pre>Tap the red box or green "map" to see the pointerevent target.</pre>
</body>
</html>