You can set zoom
property on page load
document.body.style.zoom = 1.0
But, zoom
is not a standard property for all browsers, I recommend using transform
instead.
var scale="scale(1)";
document.body.style.webkitTransform = scale; // Chrome, Opera, Safari
document.body.style.msTransform = scale; // IE 9
document.body.style.transform = scale; // General
http://jsfiddle.net/5RzJ8/