css - jquery: detach() not working in Safari -

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i've written code utilizes append() , detach() hide , reveal full screen navigation.

in safari, detach(), hide navigation, not working. why appreciated.

$(document).ready(function() {    var nav = $('#nav');   var menu = $('#menu');   var navlabel = $('#nav span')   var menuitems = $('#menu li');    menu.detach();   navlabel.attr('data-content','menu');      nav.click(function(){          console.log(menu.css("opacity"));          if (menuopacity == 0){              $("body").append(menu).after(nav);             menuopacity = 1;             menu.css("opacity");             menu.css("opacity","0.99");       navlabel.attr('data-content','back');              } else if ( menuopacity == 1 && menu.css("opacity") == 0.99 ) {                  menuopacity = 0;                 menu.css("opacity");                 menu.css("opacity","0");                 menu.on("transitionend webkittransitionend otransitionend mstransitionend", function(){                     menu.detach();                     $(this).off();                 });         navlabel.attr('data-content','menu');             }     });  });


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