100% Width Background Image With An 'auto' Height

Answer :

Tim S. was much closer to a "correct" answer then the currently accepted one. If you want to have a 100% width, variable height background image done with CSS, instead of using cover (which will allow the image to extend out from the sides) or contain (which does not allow the image to extend out at all), just set the CSS like so:

body {     background-image: url(img.jpg);     background-position: center top;     background-size: 100% auto; } 

This will set your background image to 100% width and allow the height to overflow. Now you can use media queries to swap out that image instead of relying on JavaScript.

EDIT: I just realized (3 months later) that you probably don't want the image to overflow; you seem to want the container element to resize based on it's background-image (to preserve it's aspect ratio), which is not possible with CSS as far as I know.

Hopefully soon you'll be able to use the new srcset attribute on the img element. If you want to use img elements now, the currently accepted answer is probably best.

However, you can create a responsive background-image element with a constant aspect ratio using purely CSS. To do this, you set the height to 0 and set the padding-bottom to a percentage of the element's own width, like so:

.foo {     height: 0;     padding: 0; /* remove any pre-existing padding, just in case */     padding-bottom: 75%; /* for a 4:3 aspect ratio */     background-image: url(foo.png);     background-position: center center;     background-size: 100%;     background-repeat: no-repeat; } 

In order to use different aspect ratios, divide the height of the original image by it's own width, and multiply by 100 to get the percentage value. This works because padding percentage is always calculated based on width, even if it's vertical padding.

Instead of using background-image you can use img directly and to get the image to spread all the width of the viewport try using max-width:100%; and please remember don't apply any padding or margin to your main container div as they will increase the total width of the container. Using this rule you can have a image width equal to the width of the browser and the height will also change according to the aspect ratio. Thanks.

Edit: Changing the image on different size of the window

$(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','http://i.stack.imgur.com/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>

In this way you change your image in different size of the browser.

Try this

html {    background: url(image.jpg) no-repeat center center fixed;    -webkit-background-size: cover;      -moz-background-size: cover;        -o-background-size: cover;           background-size: cover; } 

Simplified version

html {   background: url(image.jpg) center center / cover no-repeat fixed; }