Preview:
<!DOCTYPE html>
<html>
<body>
  <p>클릭하세요. 클릭한 곳의 좌표가 표시됩니다.</p>
  <em class="message"></em>
  
  <script>
  function showCoords(e) { // e: event object
    const msg = document.querySelector('.message');
    msg.innerHTML =
      'clientX value: ' + e.clientX + '<br>' +
      'clientY value: ' + e.clientY;
  }
  addEventListener('click', showCoords); // 참조하는게 없으면 기본 window 전역 객체
  </script>
</body>
</html>
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