HTML5 in Meta name= "viewport"

Viewport specific uses are:
When using the META tag, write properties in the content, separated by commas

　　　　　　

Property name	Notes
Width	Sets the width of the layout viewport as a positive integer, using the string "Width-device" to indicate the device width
Initial-scale	Sets the initial zoom value of the page, which is a number that can be taken with decimals
Minimum-scale	Allows the user's minimum zoom value to be a number that can be taken with decimals
Maximum-scale	Allows the user's maximum zoom value, which is a number that can be taken with decimals
Height	Sets the height of the layout viewport, which is not important to us and is seldom used
User-scalable	Whether the user is allowed to scale, the value is "no" or "yes", no is not allowed, yes means allow
–	–
target-densitydpi	The value can be a number or high-dpi, medium-dpi, low-dpi, device-dpi one of several strings

HTML5 in Meta name= "viewport"