The Nu HTML Checker complains about usage of aria-label for tlp-modal-close:
Warning: Possible misuse of aria-label
<!DOCTYPE html>
<html lang="en">
<title>Test</title>
<div class="tlp-modal-close" data-dismiss="modal" aria-label="Close">
×
</div>
</html>
The attribute aria-label should not be used on div element unless it is marked as landmark or widget role. In our case we have a button, therefore the div should have role="button".
And since it is a button, it should be focusable and should have focus styling.