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viewport scale doesn't work after orientation change

I use the following function to rescale my viewport on iPad: function rescale(scale){ var headElements = document.getElementsByTagName("meta"); for(var i = 0; i< headElements.length; i++){ var theElement = headElements[i]; if(theElement.name == "viewport"){ theElement.content = "width=device-width, user-scalable=no, initial-scale=" + scale + ", maximum-scale=" + scale + ";"; } } } This works an unlimited number of times (in either portrait or landscape orientation), until I change the orientation of the device, when it ceases to work until i reload the page. Is this a bug in iOS, or are there any workarounds?