Add Copy link button/Icon on any WordPress Page: Step 1: Add a button/Icon etc and give id: copy-post-link Step 2. Add HTML below and Add this code

<script>
var linkIcon = document.getElementById('copy-post-link');
// Set cursor to hand shape on hover
linkIcon.addEventListener('mouseenter', function() {
    linkIcon.style.cursor = 'pointer';
});
linkIcon.addEventListener('mouseleave', function() {
    linkIcon.style.cursor = 'default'; // Reset cursor on mouse leave
});
linkIcon.addEventListener('click', function() {
    // Create a temporary input element
    var tempInput = document.createElement('input');
    // Set its value to the post link
    tempInput.value = window.location.href;
    // Append it to the body
    document.body.appendChild(tempInput);
    // Select the input's text
    tempInput.select();
    // Copy the selected text
    document.execCommand('copy');
    // Remove the temporary input element
    document.body.removeChild(tempInput);
    // Provide some feedback to the user
    alert('Post link copied to clipboard');
});
</script>