var metas = document.getElementsByTagName('meta');
var i;
if (navigator.userAgent.match(/iPhone/i)) {
  for (i=0; i<metas.length; i++) {
    if (metas[i].name == "viewport") {
      metas[i].content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0";
    }
  }
  document.addEventListener("touchstart", gestureStart, false);
}
function gestureStart() {
  for (i=0; i<metas.length; i++) {
    if (metas[i].name == "viewport") {
      metas[i].content = "width=device-width, minimum-scale=0.25, maximum-scale=1.6";
    }
  }
}

var metas = document.getElementsByTagName('meta');
var i;
if (navigator.userAgent.match(/iPhone/i)) {
  for (i=0; i<metas.length; i++) {
    if (metas[i].name == "viewport") {
      metas[i].content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0";
    }
  }
  document.addEventListener("gesturestart", gestureStart, false);
}
function gestureStart() {
  for (i=0; i<metas.length; i++) {
    if (metas[i].name == "viewport") {
      metas[i].content = "width=device-width, minimum-scale=0.25, maximum-scale=1.6";
    }
  }
}
--- 
+++ 
@@ -6,7 +6,7 @@
       metas[i].content = "width=device-width, minimum-scale=1.0, maximum-scale=1.0";
     }
   }
-  document.addEventListener("gesturestart", gestureStart, false);
+  document.addEventListener("touchstart", gestureStart, false);
 }
 function gestureStart() {
   for (i=0; i<metas.length; i++) {
Fix bug of incorrect touch event name

Beginning of touch event is called `touchstart`, not `gesturestart` as referenced [1] here.

[1] https://developer.mozilla.org/en/docs/Web/API/Touch_events
