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(../images/pattern.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: none;
    opacity: 0;
    z-index: 0;
    -backface-visibility: hidden;
    animation: imageAnimation 24s linear infinite 0s; 
}
.cb-slideshow li:nth-child(1) span { 
    background-image: url(http://www.hgv.it/typo3temp/pics/05519a1fbd.jpg) 
}
.cb-slideshow li:nth-child(2) span { 
    background-image: url(http://www.hgv.it/typo3temp/pics/dbc2f5d6ae.jpg);
    animation-delay: 6s;
}
.cb-slideshow li:nth-child(3) span { 
    background-image: url(http://www.hgv.it/typo3temp/pics/dd3aa280bf.jpg);
    animation-delay: 12s; 
}
.cb-slideshow li:nth-child(4) span { 
    background-image: url(http://www.hgv.it/typo3temp/pics/5d2d85bf07.jpg);
    animation-delay: 18s; 
}

.cb-slideshow li:nth-child(2) div { 
    animation-delay: 6s; 
}
.cb-slideshow li:nth-child(3) div { 
    animation-delay: 12s; 
}
.cb-slideshow li:nth-child(4) div { 
    animation-delay: 18s; 
}

@keyframes imageAnimation { 
	0% {
	    opacity: 0;
	    transform: translateX(200px);
	}
	8% {
	    opacity: 1;
	    transform: translateX(0px);
	}
	17% {
	    opacity: 1;
	    transform: translateX(0px);
	}
	19% {
	    opacity: 0;
	    transform: translateX(-400px);
	}
	25% { opacity: 0 }
	100% { opacity: 0 }
}
/* Show at least something when animations not supported */
.no-cssanimations .cb-slideshow li span{
	opacity: 1;
}

@media screen and (max-width: 1140px) { 
    .cb-slideshow li div h3 { font-size: 140px }
}
@media screen and (max-width: 600px) { 
    .cb-slideshow li div h3 { font-size: 80px }
}

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":"all"}