Use the viewport meta tag to improve the presentation of your web content on iOS. Typically, you use the viewport meta tag to set the width and initial scale of the viewport. For example, if your webpage is narrower than 980 pixels, then you should set the width of the viewport to fit your web content. If you are designing an iPhone or iPod touch-specific web application, then set the width to the width of the device. Refer to Supported Meta Tags for a detailed description of the viewport meta tag.
Because iOS runs on devices with different screen resolutions, you should use the constants instead of numeric values when referring to the dimensions of a device. Use device-width for the width of the device and device-height for the height in portrait orientation.
You do not need to set every viewport property. If only a subset of the properties are set, then Safari on iOS infers the other values. For example, if you set the scale to 1.0, Safari assumes the width is device-width in portrait and device-height in landscape orientation. Therefore, if you want the width to be 980 pixels and the initial scale to be 1.0, then set both of these properties.
For example, to set the viewport width to the width of the device, add this to your HTML file:
<meta name="viewport" content="width=device-width">
To set the initial scale to 1.0, add this to your HTML file:
<meta name=“viewport” content="initial-scale=1.0">
To set the initial scale and to turn off user scaling, add this to your HTML file:
<meta name="viewport" content="initial-scale=2.3, user-scalable=no">
Create responsive web interface, is not merely the thrill of seeing the display changes when the browser is in big-minimize its resolution. But also accommodate the display to be able to perform comfortably in a variety of devices, browsers and resolution.