setInterval to incrementally increase/decrease image width

by Kishore Sahasranaman

HTML

<img src="sign.jpg" id="image" />

CSS

#image {
    transform-origin: top left; /* IE 10+, Firefox, etc. */
    -webkit-transform-origin: top left; /* Chrome */
    -ms-transform-origin: top left; /* IE 9 */
}
#image.rotate90 {
    transform: rotate(90deg) translateY(-100%);
    -webkit-transform: rotate(90deg) translateY(-100%);
    -ms-transform: rotate(90deg) translateY(-100%);
}
#image.rotate180 {
    transform: rotate(180deg) translate(-100%,-100%);
    -webkit-transform: rotate(180deg) translate(-100%,-100%);
    -ms-transform: rotate(180deg) translateX(-100%,-100%);
}
#image.rotate270 {
    transform: rotate(270deg) translateX(-100%);
    -webkit-transform: rotate(270deg) translateX(-100%);
    -ms-transform: rotate(270deg) translateX(-100%);
}

JavaScript

var angle = 0, img = document.getElementById('image');
setInterval(function() {
    angle = (angle+90)%360;
    img.className = "rotate"+angle;
},1000);