In what ways can the functionality of a "close" button in PHP code be enhanced to improve user experience?

Issue: The functionality of a "close" button in PHP code can be enhanced by adding a confirmation prompt to prevent accidental closure of a page or form. Code snippet: 

<script>
function confirmClose() {
  return confirm("Are you sure you want to close this page?");
}
</script>

<button onclick="if(confirmClose()) { window.close(); }">Close</button>

Keywords

event handling AJAX modal window jQuery user interface

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