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http://stackoverflow.com/questions/16563730/need-empty-div-with-background-image-to-force-height-and-must-be-responsive


http://jsfiddle.net/SsTZe/156/


<div class="top_banner"></div>

<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor 
incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud 
exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. 
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu 
fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in
culpa qui officia deserunt mollit anim id est laborum.</p>



<style>
.top_banner {
    background-image: url('http://cdn.sstatic.net/stackexchange/img/logos/so/so-logo.png');
    background-size: 100%;
    width: 100%;
    padding-top: 23.833333333%; // = 286h/1200w
    height: 0;
}
</style>