Show at least something when animations not supported

dabblet.css

body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form, fieldset, input, textarea, p, blockquote, th, td {
    margin: 0;
    padding: 0;
}

html, body {
    margin: 0;
    padding: 0;
}

.cb-slideshow, .cb-slideshow:after {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0px;
    left: 0px;
    z-index: 0;
}

.cb-slideshow:after {
    content: '';
    /*background: transparent url('http://pehaa.com/wp-content/uploads/2009/03/pattern1.png') repeat top left;*/
}

.cb-slideshow li span {
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 0px;
    color: transparent;
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;
    opacity: 0;
    z-index: 0;
    backface-visibility: hidden;
    animation: imageAnimation 12s linear infinite 0s;
}

.cb-slideshow li:nth-child(1) span {
    background-image: url(http://themeserver.microsoft.com/themeserver//Bing/Desktop/en-US/Images/BaliBoats1920x120011-8-2012%209_23_02%20AM.jpg);
}

.cb-slideshow li:nth-child(2) span {
    background-image: url(http://themeserver.microsoft.com/themeserver//Bing/Desktop/en-US/Images/DewDragon1920x120011-8-2012%209_23_11%20AM.jpg);
    animation-delay: 3s;
}

.cb-slideshow li:nth-child(3) span {
    background-image: url(http://themeserver.microsoft.com/themeserver//Bing/Desktop/en-US/Images/CapeMay1920x120011-1-2012%2012_19_11%20PM.jpg);
    animation-delay: 6s;
}

.cb-slideshow li:nth-child(4) span {
    background-image: url(http://themeserver.microsoft.com/themeserver//Bing/Desktop/en-US/Images/HolkhamBay1920x120011-1-2012%2012_19_34%20PM.jpg);
    animation-delay: 9s;
}

@keyframes imageAnimation {
    0% {
        opacity: 0;
        transform: translateX(100%);
    }
    5% {
        opacity: 1;
	    transform: translateX(0px);
	}
    25% {
	    opacity: 1;
	    transform: translateX(0px);    
    }
    30% {
        opacity: 0;
        transform: translateX(-100%);
    }
}
/* Show at least something when animations not supported */
.no-cssanimations .cb-slideshow li span {
    opacity: 1;
}

dabblet.html

<ul class="cb-slideshow">
            <li><span></span></li>
            <li><span></span></li>
            <li><span></span></li>
            <li><span></span></li>
        </ul>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}