workings-book/footer.html

<script>
$(document).ready(function () {
  // ☜ ☝ ☞ ☟ ☆ ✠ ✡ ✢ ✣ ✤ ✥ ✦ ✧ ✩ ✪ 
  var closed_sigil = 'show';
  var open_sigil = 'hide';

  var togglesigil = function (elem) {
    var sigil = $(elem).html();
    if (sigil === closed_sigil) {
      $(elem).html(open_sigil);
    } else {
      $(elem).html(closed_sigil);
    }
  };

  $(".details").each(function () {
    var $this = $(this);
    var $button = $('<button class=clicker-button>' + open_sigil + '</button>');
    var $details_full = $(this).find('.full');

    $button.click(function (e) {
      e.preventDefault();
      $details_full.toggle({
        duration: 550
      });
      togglesigil(this);
    });

    $(this).find('.clicker').append($button);
    $button.show();
  });

  // $('.details .full').hide();
});
</script>
</body>
</html>