iPad, iPod and iPhone initial scale

scale.js

(function(doc) {
  var viewport = document.getElementById('viewport');
  if ( navigator.userAgent.match(/iPhone/i) || navigator.userAgent.match(/iPod/i)) {
    doc.getElementById("viewport").setAttribute("content", "width=1024,initial-scale=0.469");
  } else if ( navigator.userAgent.match(/iPad/i) ) {
    doc.getElementById("viewport").setAttribute("content", "initial-scale=1.0");
  }
}(document));