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              <header>
 <div class="banner">
  <div class="img-1" style="background-image: url(https://unsplash.it/1280/640?image=1044);"></div>
  <div class="img-2" style="background-image: url(https://unsplash.it/1280/640?image=1033);"></div>
  <div class="img-3" style="background-image: url(https://unsplash.it/1280/640?image=1019);"></div>
  <div class="img-4" style="background-image: url(https://unsplash.it/1280/640?image=1000);"></div>
 </div>
</header>
<h1>CSS Looping Fader</h1>
<p>This is based on an example by <a href="https://snook.ca/archives/html_and_css/simplest-css-slideshow">Jonathan Snook</a>, but has been updated to fade seamlessly between images without cross fading (which reveals the background). This is achieved by animating the z-index while simultaneously delaying the fade out of each layer until the replacing layer is fully visible.</p>
<p>While the animation timeline does depend on a set number of images, it would be possible to set up classes for each variation (for example, 4, 5, and 6 image rotations). The total duration = (fade curation + visible duration) * number of images. More details can be found in the Jonathan Snook article linked above.</p>
<p>This version also uses CSS backgrounds (defined in the HTML by an assumed CMS) instead of IMG tags to provide a more seamless (and responsive, depending on your CSS setup) end result.</p>

<h1>Other animations</h1>
<p>Among any other animatable CSS effects, clipping path animations are pretty effective. However, this may take significantly more processing power (so watch your CPU!).</p>

<section>
 <div class="banner">
  <div class="img-1" style="background-image: url(https://unsplash.it/1280/640?image=993);"></div>
  <div class="img-2" style="background-image: url(https://unsplash.it/1280/640?image=221);"></div>
  <div class="img-3" style="background-image: url(https://unsplash.it/1280/640?image=984);"></div>
  <div class="img-4" style="background-image: url(https://unsplash.it/1280/640?image=651);"></div>
 </div>
</section>
            
          
!
            
              html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
	margin: 0;
	padding: 0;
	border: 0;
	outline: 0;
	font-weight: inherit;
	font-style: inherit;
	font-size: 100%;
	font-family: inherit;
	vertical-align: baseline;
}

body {
	line-height: 1;
	font-family: 'Avenir Next', 'Myriad', sans-serif;
	-webkit-font-smoothing: antialiased;
	text-align: center;
}

header, section, footer,
aside, nav, article, figure {
	display: block;
}

body {
	width: 100%;
	color: #767a7d;
	background-color: #1b2126;
}

header {
	width: 100%;
	height: 480px;
	margin: 0 0 40px 0;
	padding: 0;
}

a, a:visited {
	color: #a4a6a8;
	text-decoration: none;
	-webkit-transition: color 0.2s ease;
	-moz-transition: color 0.2s ease;
	-ms-transition: color 0.2s ease;
	-o-transition: color 0.2s ease;
	transition: color 0.2s ease;
}

a:hover, a:active {
	color: #d1d3d4;
	text-decoration: none;
}

a:focus {
	outline: none;
}

a.info, a.info:visited, a.info:hover, a.info:active, a.purchase, a.purchase:visited, a.purchase:hover, a.purchase:active {
	color: #ffffff;
	-webkit-transition: background-color 0.2s ease;
	-moz-transition: background-color 0.2s ease;
	-ms-transition: background-color 0.2s ease;
	-o-transition: background-color 0.2s ease;
	transition: background-color 0.2s ease;
}

a.info:hover, a.info:active, a.purchase:hover, a.purchase:active {
	background-color: #f2b90c;
}

h1, h2, h3, h4, h5, h6 {
	line-height: 1.5em;
	color: #ffffff;
}

h1 {
	font-size: 2em;
}

h2 {
	font-size: 3em;
	font-weight: 100;
}

h3 {
	font-size: 1.5em;
}

h4 {
	font-size: 1.3em;
}

p {
	width: 480px;
	margin: 2em auto;
}

/* Banner Backgrounds
/*---------------------------------------------*/

.banner {
	position: absolute;
	width: 100%;
	height: 480px;
}

.img-1, .img-2, .img-3, .img-4 {
	position: absolute;
	top: 0;
	width: 100%;
	height: 480px;
	background-size: cover;
	background-repeat: no-repeat;
	background-position: center;
	z-index: -18;
	opacity: 0;
	animation-name: fade;
	animation-duration: 16s;
	animation-iteration-count: infinite;
}

section .img-1, section .img-2, section .img-3, section .img-4 {
	opacity: 1;
	animation-name: iris;
	animation-duration: 16s;
	animation-iteration-count: infinite;
}

.img-1 { animation-delay: 0s; }
.img-2 { animation-delay: 4s; }
.img-3 { animation-delay: 8s; }
.img-4 { animation-delay: 12s; }

/* Banner Animations (4s per image, 16s total timeline)
/*---------------------------------------------*/

@keyframes crossfade {
	/* This is the default behaviour as described by Jonathan Snook*/
	00.00%	{ opacity: 0; }
	06.25%	{ opacity: 1; }
	25.00%	{ opacity: 1; }
	31.25%	{ opacity: 0; }
	100.0%	{ opacity: 0; }
}

@keyframes fade {
	/* By offsetting the fade out and animating z-index, we can prevent the background from showing up at all*/
	00.00%	{ opacity: 0; z-index: -10; }
	06.25%	{ opacity: 1; z-index: -10; }
	31.25%	{ opacity: 1; z-index: -12; }
	37.50%	{ opacity: 0; z-index: -14; }
	100.0%	{ opacity: 0; z-index: -16; }
}

/* Animating a clip-path in Google Chrome can destroy performance...it's crazy CPU intensive */
@keyframes iris {
	00.0%	{ clip-path: circle(0% at 50% 0%); z-index: -10; }
	12.5%	{ clip-path: circle(120% at 50% 0%); z-index: -10; }
	31.25%	{ clip-path: circle(120% at 50% 0%); z-index: -12; }
	37.50%	{ clip-path: circle(0% at 50% 0%); z-index: -14; }
	100%	{ clip-path: circle(0% at 50% 0%); z-index: -16; }
}
            
          
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