A functional door.

dabblet.css

/**
 * A functional door.
 */

#wall {
	background-color: #eee;
	bottom: 0;
	left: 0;
	position: absolute;
	right: 0;
	top: 0;
	transform: rotateX(-10deg);
	transform-origin: 0 100%;
	transform-style: preserve-3d;
}

#door-container {
	background-color: black;
	height: 100%;
	margin: 0 auto;
	width: 300px;
}

#door {
	background-color: brown;
	height: 100%;
	margin: auto;
	position: relative;
	transform-origin: 0 0;
	transition: transform 0.5s ease;
	width: 300px;
}

#door .knob {
	background-color: gold;
	border-radius: 10px;
	height: 20px;
	margin-top: -10px;
	position: absolute;
	right: 10px;
	top: 50%;
	width: 20px;
}

#open:target + #wall #door {
	transform: rotateY(-145deg);
}

#open:target + #wall #open-link {
	display: none;
}

#close-link {
	display: none;
}

#open:target + #wall #close-link {
	display: inline;
}

dabblet.html

<span id="open"></span>
<div id="wall">
	<div id="door-container">
		<div id="door">
			<a href="#open" id="open-link" class="knob"></a>
			<a href="#closed" id="close-link" class="knob"></a>
		</div>
	</div>
</div>

settings.json

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