var resizeTimer = false;
$(window).resize('load', function() {
if (resizeTimer !== false) { clearTimeout(resizeTimer); }
resizeTimer = setTimeout(function() {
winHeight = $(window).height();
}, 20);
});
$(window).scroll(function(){
winScrollTop = $(window).scrollTop();
$('.invisible').each(function() {
var itemTtop = $(this).offset().top;
if( winScrollTop + winHeight > itemTtop ) {
$(this).removeClass('invisible');
$(this).addClass('visibled');
}
});
});
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