want to show the thickness of an element while it rotate

Question

I am rotating a coin along Y axis by 90deg through CSS. Is there a way so that I can show the thickness of the coin after it have rotated, I thought I can scaleY after the c

Answer 1

You can use pseudo-elements to give an effect that is similar. Here is an example: http://jsfiddle.net/joshnh/y7rQL/

<div class="coin"></div>

body {
    transform: perspective(500px);
    transform-style: preserve-3d;
}
.coin {
    background-image: url("http://www.coolemails4u.com/wp-content/uploads/2010/10/indian_rupee.png");
    background-size: 100% 100%;
    border-radius: 100%;
    height: 100px;
    margin: 50px auto;
    position: relative;
    transition: .5s linear;
    transform-style: preserve-3d;
    width: 100px;
}
.coin:after {
    background-color: #262626;
    background-image: -webkit-linear-gradient(hsla(0,0%,100%,.25), hsla(0,0%,0%,.25));
    bottom: 0;
    content: '';
    left: 45px;
    position: absolute;
    top: 0;
    transform: rotateY(-90deg);
    transform-origin: 100% 50%;
    width: 5px;
    z-index: -10;
}
.coin:before {
    background-color: #262626;
    background-image: -webkit-linear-gradient(hsla(0,0%,100%,.25), hsla(0,0%,0%,.25));
    border-radius: 100%;
    content: '';
    height: 100px;
    left: 0;
    position: absolute;
    top: 0;
    transform: translateZ(-5px);
    width: 100px;
}
.coin:hover {
    transform: rotateY(90deg);
}​

Also, here is a version that spins 180 degrees (it isn't quite as nice though): http://jsfiddle.net/joshnh/Bz22S/