Scaling vs Zooming

css-zoom-vs-scaling.js

var scaleElementWidth = $('body').width();
var scaleElementHeight = $('body').height();

var windowWidth = $(window).width();
var windowHeight = $(window).height();

var wRatio = windowWidth/scaleElementWidth;
var hRatio = windowHeight/scaleElementHeight;
var ratio = Math.min(wRatio, hRatio);

$('body').css('-webkit-transform', 'scale('+ratio+')');