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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>MouseEvent.x — alias</title>
</head>
<body>
  <p>Click anywhere to compare x and clientX.</p>
  <pre id="out">—</pre>
  <script>
    document.addEventListener("click", function (e) {
      document.getElementById("out").textContent = [
        "x: " + e.x,
        "clientX: " + e.clientX,
        "equal: " + (e.x === e.clientX)
      ].join("\n");
    });
  </script>
</body>
</html>

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MouseEvent.x — prove alias (Try It)