HTML5 3D book page turning animation graphic code example

<p class="book p3d">
    <p class="back-cover p3d">
        <p class="page back flip"></p>
        <p class="page front p3d">
            <p class="shadow"></p>
            <p class="dino"></p>
        </p>
    </p>
    <p class="front-cover p3d">
        <p class="page front flip p3d">
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam fermentum nisl quis nulla eleifend dignissim. 
            Curabitur varius lobortis tincidunt. Maecenas gravida, nulla quis luctus imperdiet, ipsum nibh consectetur ante, in sodales massa tortor eget neque. 
            Donec porta ligula massa, id sagittis est. Ut nisl tellus, faucibus nec feugiat ut, laoreet iaculis felis. 
            Suspendisse ultrices mauris vel tellus suscipit commodo. Integer vitae tortor erat. Pellentesque non tempor nisi.</p>
        </p>
        <p class="page back"></p>
    </p>
</p>

.book {
	width: 300px;
	height: 300px;
	margin-top: -150px;
	position: absolute;
	left: 50%;
	top: 50%;
	-webkit-transform: rotateX(60deg);
	-moz-transform: rotateX(60deg);
	-ms-transform: rotateX(60deg);
	-o-transform: rotateX(60deg);
	transform: rotateX(60deg);
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	-o-user-select: none;
	user-select: none;
}
.page {
	width: 300px;
	height: 300px;
	padding: 1em;
	position: absolute;
	left: 0;
	top: 0;
	text-indent: 2em;
}
.front {
	background-color: #d93e2b;
}
.back {
	background-color: #fff;
}
.front-cover {
	cursor: move;
	-webkit-transform-origin: 0 50%;
	-moz-transform-origin: 0 50%;
	-ms-transform-origin: 0 50%;
	-o-transform-origin: 0 50%;
	transform-origin: 0 50%;
	-webkit-transform: rotateY(0deg);
	-moz-transform: rotateY(0deg);
	-ms-transform: rotateY(0deg);
	-o-transform: rotateY(0deg);
	transform: rotateY(0deg);
}
.front-cover .back {
	background-image: url(mdn.png);
	background-repeat: no-repeat;
	background-position: 50% 50%;
	-webkit-transform: translateZ(3px);
	-moz-transform: translateZ(3px);
	-ms-transform: translateZ(3px);
	-o-transform: translateZ(3px);
	transform: translateZ(3px);
}
.back-cover .back {
	-webkit-transform: translateZ(-3px);
	-moz-transform: translateZ(-3px);
	-ms-transform: translateZ(-3px);
	-o-transform: translateZ(-3px);
	transform: translateZ(-3px); 
}
.p3d {
	-webkit-transform-style: preserve-3d;
	-moz-transform-style: preserve-3d;
	-ms-transform-style: preserve-3d;
	-o-transform-style: preserve-3d;
	transform-style: preserve-3d;
}
.flip {
	-webkit-transform: rotateY(180deg);
	-moz-transform: rotateY(180deg);
	-ms-transform: rotateY(180deg);
	-o-transform: rotateY(180deg);
	transform: rotateY(180deg);
}
.dino,
.shadow {
	width: 196px;
	height: 132px;
	position: absolute;
	left: 60px;
	top: 60px;
	-webkit-transform-origin: 0 100%;
	-moz-transform-origin: 0 100%;
	-ms-transform-origin: 0 100%;
	-o-transform-origin: 0 100%;
	transform-origin: 0 100%;
}
.dino {
	background: url(dino.png) no-repeat;

}
.shadow {
	background: url(shadow.png) no-repeat;
}

(function (window, document) {

	var prefixes = ['Webkit', 'Moz', 'ms', 'O', ''],
		book = document.querySelectorAll('.book')[0],
		page = document.querySelectorAll('.front-cover')[0],
		dino = document.querySelectorAll('.dino')[0],
		shadow = document.querySelectorAll('.shadow')[0],
		hold = false,
		centerPoint = window.innerWidth / 2,
		pageSize = 300,
		clamp = function (val, min, max) {
			return Math.max(min, Math.min(val, max));
		};

	page.onmousedown = function () {
		hold = true;
	};

	window.onmouseup = function () {
		if (hold) {
			hold = false;
		}
	};

	window.onresize = function () {
		centerPoint = window.innerWidth / 2;
	};

	window.onmousemove = function (evt) {
		if (!hold) {
			return;
		}

		var angle = clamp((centerPoint - evt.pageX + pageSize) / pageSize * -90, -180, 0),
			i, j;

		for (i = 0, j = prefixes.length; i < j; i++) {
			book.style[prefixes[i] + &#39;Transform&#39;] = &#39;rotateX(&#39; + (60 + angle / 8) + &#39;deg)&#39;;
			page.style[prefixes[i] + &#39;Transform&#39;] = &#39;rotateY(&#39; + angle + &#39;deg)&#39;;
			dino.style[prefixes[i] + &#39;Transform&#39;] = &#39;rotateX(&#39; + (angle / 2) + &#39;deg)&#39;;
			shadow.style[prefixes[i] + &#39;Transform&#39;] = &#39;translateZ(1px) skewX(&#39; + (angle / 8) + &#39;deg)&#39;;
		}
	};

})(window, document);