jquery scrolltop animation flips on click but then scrolls smoothly -


i've set function:

      $(function() {       $('.top a').bind('click',function(event){           var $anchor = $(this);            $('html, body').stop().animate({               scrolltop: $($anchor.attr('href')).offset().top           }, 5000,'easeinoutexpo');           event.preventdefault();       });   });

it work online when click it jumps pixels first , scrolls smoothly top.

there no margin or padding wether on body nor on wrapper. div i'm targeting first element on page , 1 i'm starting right @ bottom , outside wrapper.

what little flip @ first?


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