Show img[alt] in a Bootstrap 3 popover without any extra markup (doesn't break floats etc)

popover.js

(function($) {
  $('img[alt]').each(function() {
    var $this = $(this);
    $this
      .attr('data-content', $this.attr('alt'))
      .hover(function() {
        $(this).popover('show');
      }, function() {
        $(this).popover('hide');
      });
  }).popover({
    trigger: 'manual',
    placement: 'bottom auto',
  });
})(jQuery);