HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>eventPhase capture</title>
  <style>
    #parent { padding: 24px; background: #fce7f3; border: 2px solid #db2777; }
    #child { padding: 16px; background: #d1fae5; border: 2px solid #059669; cursor: pointer; }
  </style>
</head>
<body>
  <div id="parent">
    parent (capture)
    <div id="child">child — click me</div>
  </div>
  <pre id="out">Waiting...</pre>
  <script>
    var names = ["none", "capturing", "target", "bubbling"];
    var out = document.getElementById("out");
    var lines = [];

    function log(event) {
      lines.push(
        event.currentTarget.id + ": " + names[event.eventPhase]
      );
      out.textContent = lines.join("\n");
    }

    document.getElementById("parent").addEventListener("click", function (event) {
      lines = [];
      log(event);
    }, true); // capture

    document.getElementById("child").addEventListener("click", log);
  </script>
</body>
</html>

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Event.eventPhase — capture on parent (Try It)