Force page zoom at 100% with JS

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/

You can reset the code with this:

$("input, textarea").focusout(function(){
    $('meta[name=viewport]').remove();
    $('head').append('<meta name="viewport" content="width=device-width, maximum-scale=1.0, user-scalable=0">');

    $('meta[name=viewport]').remove();
    $('head').append('<meta name="viewport" content="width=device-width, initial-scale=yes">' );
});

I think, this is very helpful answer how to detect page zoom level in all modern browsers. Then the answer to your question for IE:

document.body.style.zoom = screen.logicalXDPI / screen.deviceXDPI;