HTML Meta Viewport Property Description

What is viewport

The mobile browser is to put the page in a virtual "window" (viewport), usually this virtual "window" (viewport) wider than the screen, so that you do not have to squeeze each page into a very small window (this will destroy the layout of the page without the optimization of the mobile browser), Users can view different parts of a Web page by panning and zooming. The mobile version of Safari has recently introduced the viewport META tag, which allows web developers to control the size and scale of viewport, as well as the basic support of other mobile browsers.

Viewport Foundation

A common viewport meta tag for pages optimized for mobile pages is as follows:

<meta name= "viewport" content= "width=240, height=320, User-scalable=yes, initial-scale=2.5, maximum-scale=5.0, minimun-scale=1.0 ">

Width: Controls the size of the viewport, you can specify a value if 600, or a special value, such as device-width for the width of the device (in pixels of the CSS when scaled to 100%).
Height: corresponds to width, specifying height.
Initial-scale: The initial zoom ratio, which is the scale at which the page is first load.
Maximum-scale: Allows the user to zoom to the maximum scale.
Minimum-scale: The minimum scale to which the user is allowed to zoom.
User-scalable: Whether the user can manually scale

HTML Meta Viewport Property Description