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    4
    Вклад в тег
    
      
      
    
  
  
.logo{
    width: 100px;
    height: 20px;
    position: relative;
    background-size: cover;
    background-image: url(logo.png);
}
.logo__loaded{
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 0%;
    background-size: cover;
    background-image: url(logo2.png);
}<div class="logo">
  <div class="logo__loaded" style="70%"></div>
</div      if ($(window).width() >= 992) {
$.ajax({
         url: "load.html",
         success: function (data) { 
           $('div.upload').html(data);
         }
});
    } else {
$.ajax({
         url: "main.html",
         success: function (data) { 
           $('div.upload').html(data);
         }
});
}<script type="text/javascript" src="js/jquery.multiscroll.min.js"></script>      function fixSize(){
     if($(window).width() > 757) { 
       $('#sidebar').css({
          'height':  $(".post").height()
        });
     } else [
       $('#sidebar').css({
          'height':  'auto'
        });
     }
}
    $(window).resize(fixSize);
    fixSize();<article  class="item">
    <header class="item-header">
          <img>
          <h3></h3>
    </header>
    <div class="item-body">
        <p></p>
    </div>
</article><main>,  если можно - то <div class="item-body"> заменить на <main class="item-body"><footer>