html - Dynamic element height to match background cover dimensions -

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i'm using following css set cover background image on element:

.bg {     background: url(images/kitteh1.jpg) no-repeat;     background-size: cover;     background-position: center;     height: 200px; }

what right, css-only, way of having element size match of background image, such image first takes 100% width, , takes height necessary fit original aspect ratio?

here's playground: http://jsfiddle.net/e5ek812c/

as far know, css never aware of image size. can do, however, set padding-top or padding-bottom image's ratio (height is56.25% of width here).

explanation

padding-top, when set percentage, uses element's width reference (100%). unlike height.

.a { background-color: #ddd; }  .bg {      background: url(https://prinzhorn.github.io/skrollr/examples/images/kitteh1.jpg) no-repeat;      background-size: cover;      background-position: center;      padding-top: 56.25%;  }  .c { background-color: #aaa; }
<div class="a">hello</div>  <div class="bg"></div>  <div class="c">bye</div>

updated js fiddle


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