CSS States

dabblet.css

/* CSS States */
body {
	background: url(http://dabblet.com/img/noise.png);
	background-color: #F5F2F0;
	font-family: Georgia, serif;
	font-size: 18px;
	line-height: 1.6em;
	text-shadow: 0 2px 0 white;
	color: #222;
}
.wrapper {
	width: 900px;
	margin: 70px auto; 
}
h1 {
	font-family: Helvetica, Arial, sans-serif;
	text-align: center;
	font-size: 1.6em;
}
a {
	text-decoration: none;
	color: #B46919;
}
a:visited {
	color: #834B0F;
}
a:hover {
	color: #E9A051;
}
.device {
	display: inline-block;
	position: relative;
	background:#AD0F0F;
	width: 230px;
	height: 450px;
	padding: 20px 15px;
	margin: 20px;
	border-radius: 20px;
	border: 1px solid #410707;
	border-bottom-width: 8px;
	box-shadow: 0 2px 5px rgba(0,0,0,0.7),
		    inset 0 0 10px rgba(255,255,255,0.5),
		    inset 0 2px 2px rgba(255,255,255,0.25);
}
section {
	display: inline-block;
	vertical-align: top;
	padding: 30px;
	width: 500px;

}
small {
	display: block;
	margin-top: 20px;
	opacity: 0.3;
	text-align: center;
	padding: 
	20px;
	transition: opacity 0.5s;
}
small:hover {
	opacity: 1;
}
.up, .down, .left, .right {
	position: absolute;
	z-index: 1001;
	margin-left: 50%;
	font-size: 40px;
	width: 50px;
	height: 50px;
	background: #FFA03A;
	border: 1px solid #915515;
	box-shadow: 0 3px 0 #52300E,
		    inset 0 0 10px rgba(255,255,255,0.3);

	appearance: none;
	border-radius: 50px;
	cursor: pointer;
}


.up:active, .down:active, .left:active, .right:active {
	margin-top: 3px;
	box-shadow: inset 0 1px 1px rgba(0,0,0,0.3);
}

.up:before, .down:before, .left:before, .right:before {
	display: block;
	position: absolute;
	content: "";
	width: 15px;
	height: 15px;
	border-radius: 15px;
	background: #E4923D;
	box-shadow: 0 2px 2px rgba(255,255,255,0.25),
		    inset 0 1px 0 rgba(0,0,0,0.5);

}

.up:after, .down:after, .left:after, .right:after {
	display: block;
	position: absolute;
	content: "";
	top: -5px;
	left: -6px;
	width: 60px;
	height: 60px;
	border-radius: 60px;
	box-shadow: 0 2px 2px rgba(255,255,255,0.25),
		    inset 0 2px 2px rgba(0,0,0,0.5);
}

.up:active:after, .down:active:after, .left:active:after, .right:active:after {
	top: -8px;
}

.up {
	top: 300px;
	left: -25px;	
}
.up:before {
	top: 5px;
	left: 17px;
}
.down {
	top: 400px;
	left: -25px;
}
.down:before {
	bottom: 5px;
	left: 17px;
}
.left {
	top: 350px;
	left: -75px;
}
.left:before {
	top: 17px;
	left: 5px;
}

.right {
	top: 350px;
	left: 25px;
}
.right:before {
	top: 17px;
	right: 5px;
}

.up:active ~ .screen .char, .down:active ~ .screen .char, .left:active ~ .screen .char, .right:active ~ .screen .char {
	transition: margin-top 2s linear, 
	            margin-left 2s linear;          
}

.up:active ~ .screen .char {	
	margin-top: -84px;
	background-position: 0 -144px;
	animation: walk-up 0.65s infinite;	
}

.down:active ~ .screen .char {
	margin-top: 90px;
	background-position: 0 0;
	animation: walk-down 0.65s infinite;
}

.left:active ~ .screen .char {	
	margin-left: -88px;
	background-position: 0 -48px;
	animation: walk-left 0.65s infinite;
}

.right:active ~ .screen .char {
	margin-left: 88px;
	background-position: 0 -96px;
	animation: walk-right 0.65s infinite;
}

.screen {
	position: relative;
	margin: 0 auto;
	padding: 128px 112px;
	box-sizing: border-box;
	width: 224px;
	height: 256px;
	overflow:hidden;
	box-shadow: 0 0 20px rgba(255,255,255,0.25),
		    0 2px 1px rgba(255,255,255,0.15);
	background: url("http://joelb.me/extassets/sprites/home-layer-1.png") no-repeat;
}

.overlay {
	position: absolute;
	width: 100%;
	height: 100%;
	top: 0;
	left: 0;
	background: url("http://joelb.me/extassets/sprites/home-layer-2.png") no-repeat;
	box-shadow: inset 0 0 50px rgba(0,0,0,0.5);
	z-index: 1000;
}

.char {
	position: relative;
	left: -16px;
	background-image: url("http://joelb.me/extassets/sprites/old-man.png");
	background-position: -32px 0;
	width: 32px;
	height: 48px;
	transition-property: margin-top, margin-left, background-position;
	transition-duration: 0;
	transition-delay: 999999s;
	transition-timing-function: linear;
}

@keyframes walk-up {
	0%, 32.99% { background-position: 0 -144px; }
	33%, 65.99% { background-position: 32px -144px; }
	66%, 100% { background-position: -32px -144px; }
}

@keyframes walk-down {
	0%, 32.99% { background-position: 0 0; }
	33%, 65.99% { background-position: 32px 0; }
	66%, 100% { background-position: -32px 0; }
}

@keyframes walk-left {
	0%, 32.99% { background-position: 0 -48px; }
	33%, 65.99% { background-position: 32px -48px; }
	66%, 100% { background-position: -32px -48px; }
}

@keyframes walk-right {
	0%, 32.99% { background-position: 0 -96px; }
	33%, 65.99% { background-position: 32px -96px; }
	66%, 100% { background-position: -32px -96px; }
}

dabblet.html

<div class="wrapper">
	<h1>Maintaining CSS Style States using "Infinite" Transition Delays</h1>
	
	<div class="device">
		<button class="up"></button>
		<button class="down"></button>
		<button class="left"></buton>
		<button class="right"></button>
	
		<div class="screen">
			<div class="char"></div>
			<div class="overlay"></div>
		</div>
	</div>
	
	<section>
	<p>
		This demo is <strong>completely JavaScript-free</strong>. 
		Feel free to move the character around with the D-pad, and notice how it always
		keeps its position after you stop moving. 
	</p>
	<p>
		This is made possible by using a virtually infinite transition delay, so that the
		CSS rules never return to their default state. The character will always be stuck 
		in a transition and only moves when you hold down a button.
	</p>
	
	<p>
		I've written a 
	<a target="_blank" href="http://joelb.me/blog/2012/maintaining-css-style-states-using-infinite-transition-delays/"> blog post </a> explanining how 
		this all works, but please keep in mind that things like this should ideally be handled 
		with Javascript. After all, this is a dirty hack, not a CSS feature.
	</p>
	</section>
	
	<small>Credit goes to to <a target="_blank" href="http://www.tekepon.net/fsm/">First Seed Material</a> for the 
	character sprite, and <a target="_blank" href="http://vxresource.wordpress.com/2010/03/17/the-real-macks-tileset/">
	Mack</a> for the map tileset.
	 </small>
</div>

settings.json

{"view":"split-vertical","seethrough":"","prefixfree":"1","page":"html"}

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The infinite transition-delay trick is clever, but it feels pretty fragile once you start depending on sibling order and :active for state. The demo also seems to have a few copy/paste issues, especially the unfinished url() values and the tag, so fixing those would make it easier to test what is actually happening. I’d definately be careful with pasted demos picking up unrelated links like https://tonybeteesti.com/, since they distract from the CSS mechanics more than they help. Still, as a hacky explanation of persistent CSS state, it gets the point across surprisingly well.