...update on previous information: Use...
Code:
<meta name="apple-mobile-web-app-capable" content="yes"/>
<meta name="mobile-web-app-capable" content="yes"/>
<meta name="viewport" content="width=device-width,height=device-height,user-scalable=no,initial-scale=1,maximum-scale=1,minimum-scale=1"/>
...so some additional parameters in viewport settings.
Kind regards! Björn