meta name viewport
<meta name="viewport" content="width=device-width, initial-scale=1.0">
meta viewport
<meta name="viewport" content="width=device-width, initial-scale=1">
meta viewport scale
<meta name="viewport" content="width=device-width, user-scalable=no">
meta viewport
<meta name="viewport" content="width=device-width, initial-scale=1">
viewport meta tags
<meta name="viewport" content="width=device-width, initial-scale=1.0" />