Are there any potential pitfalls to be aware of when implementing this functionality in a modal window?

One potential pitfall to be aware of when implementing functionality in a modal window is ensuring that the modal is accessible to all users, including those using assistive technologies. To solve this issue, make sure to include proper ARIA attributes and keyboard navigation support in the modal window. 

<div id="myModal" class="modal" role="dialog" aria-labelledby="modalTitle" aria-describedby="modalDescription">
  <div class="modal-content">
    <h2 id="modalTitle">Modal Title</h2>
    <p id="modalDescription">Modal Description</p>
    <button id="closeModal" onclick="closeModal()">Close Modal</button>
  </div>
</div>

<script>
function closeModal() {
  var modal = document.getElementById('myModal');
  modal.style.display = 'none';
}
</script>

Keywords

modal window functionality implementation PHP pitfalls

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