Animate CSS Background-position With Smooth Results (sub-pixel Animation)


Answer :

Checkout this example:

#content {   height: 300px;   text-align: center;   font-size: 26px;   color: #000;   position:relative; } .bg{   position: absolute;   left: 0;   right: 0;   top: 0;   bottom: 0;   z-index: -1;   background: url(http://www.gstatic.com/webp/gallery/1.jpg) 0% 0% repeat;   animation-name: MOVE-BG;   animation-duration: 100s;   animation-timing-function: linear;   animation-iteration-count: infinite; } @keyframes MOVE-BG {    from {      transform: translateX(0);    }    to {       transform: translateX(-187%);    } }
<div id="content">Foreground content   <div class="bg"></div> </div>

http://jsfiddle.net/5pVr4/4/


Animating background-position will cause some performance issues. Browsers will animate transform properties much cheaply, including translate.

Here is an example using translate for an infinite slide animation (without prefixes):

http://jsfiddle.net/brunomuller/5pVr4/504/

@-webkit-keyframes bg-slide {     from { transform: translateX(0); }     to { transform: translateX(-50%); } }  .wrapper {     position:relative;     width:400px;     height: 300px;     overflow:hidden; }  .content {     position: relative;     text-align: center;     font-size: 26px;     color: #000; }  .bg {     width: 200%;     background: url(http://www.gstatic.com/webp/gallery/1.jpg) repeat-x;     position:absolute;     top: 0;     bottom: 0;     left: 0;     animation: bg-slide 20s linear infinite; }

You should adjust your HTML and CSS little bit

Working Demo

HTML

<div id="wrapper">     <div id="page">     Foreground content </div>  <div id="content"> </div> </div>

CSS

@-webkit-keyframes MOVE-BG {     from { left: 0; }     to { left: -2000px; } }  #wrapper {     position:relative;     width:800px;     height: 300px;     overflow:hidden; }  #page {     text-align: center;     font-size: 26px;     color: #000; }  #content {     width: 2000px;     height: 300px;     background: url(http://www.gstatic.com/webp/gallery/1.jpg) 0% 0% repeat;     position:absolute;     top: 0;     left: 0;     z-index:-1;     -webkit-animation-name: MOVE-BG;     -webkit-animation-duration: 100s;     -webkit-animation-timing-function: linear;     -webkit-animation-iteration-count: infinite; }

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