[yakshaving_jgt]

JavaScript:

    var xs = document.querySelectorAll('.x');

    for (var i = 0; i < xs.length; i++) {
      xs[i].addEventListener('click', function() {
        this.style.display = 'none';
      });
    }

jQuery:

    $('.x').on('click', function() { $(this).hide() });

ಠ_ಠ

[recursive]

Also javascript

    document.body.addEventListener("click", ev => ev.target.classList.contains('x') && ev.target.hidden = true);