Reports

$(window).resize(function(){
  var windowWidth = $(window).width();
  var imgSrc = $('#image');
  if(windowWidth <= 400){           
    imgSrc.attr('src','http://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-icon.png?v=c78bd457575a');
  }
  else if(windowWidth > 400){
    imgSrc.attr('src','https://i.sstatic.net/oURrw.png');
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="image-container">
  <img id="image" src="http://cdn.sstatic.net/Sites/stackoverflow/company/img/logos/so/so-icon.png?v=c78bd457575a" alt=""/>
</div>

position: relative;

width: 200vw;

height:

100vh;

overflow: hidden;

background: #E08183;

background-size: 30%;

overflow: hidden;

rent position: relative;

width: 200vw;

height:

100vh;

overflow: hidden;

background: #E08183;

background-size: 30%;

overflow: hidden; position: relative;

width: 200vw;

height:

100vh;

overflow: hidden;

background: #E08183;

background-size: 30%;

overflow: hidden;

rent

tab_index=emphasized text rent

tab_index= tab_index=

79357973