Detailed explanation of the application of meta tags in mobile platform development_HTML/Xhtml_Web page production

Everyone is very familiar with the meta tag in web layouts on desktop platforms. It is always located inside the head element. Friends who do SEO must have a special feeling for meta. Today we will talk about meta on mobile platforms. Tags, what are the magical effects of meta tags on mobile platforms?

1. Meta viewport

Speaking of mobile platform meta tags, we have to talk about viewport. So what is viewport?
Viewport is the visual area. For desktop browsers, viewport refers to the area used to view web pages after removing all toolbars, status bars, scroll bars, etc.
. For traditional WEB pages, it is normal for the width of 980 to be displayed on the iPhone, and it also fills the screen. But for webapps, it may be a bit of a problem. On iPhones, our webapps usually have a width of 100cm in portrait mode. 320, what effect will our 320 page display on the iPhone? Some people may think that the iPhone is not 320mm wide, it should fill the screen, right? What is the reality? Let’s take a look at how the following layout appears on the iPhone

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The code is as follows:

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So we must change the viewport. We have the following attribute values ​​​​that can be set:

width: width of the viewport (range from 200 to 10,000, default is 980 pixels)
height: height of the viewport (range from 223 to 10,000)
initial-scale: initial scaling (range from > ;0 to 10)
minimum-scale: The minimum ratio that the user is allowed to zoom to
maximum-scale: The maximum ratio that the user is allowed to zoom to
user-scalable: Whether the user can manually zoom

For these attributes, we can set one or more of them, and you do not need to set them all at the same time. iPhone will automatically calculate other attribute values ​​​​based on the attributes you set, instead of directly using the default values.

If you set initial-scale=1, then width and height will automatically be 320*356 in portrait mode (not 320*480 because the address bar etc. all occupy space), and 480*208 in landscape mode. Similarly, if you only set width, initial-scale and height will be automatically calculated. For example, if you set width=320, the initial-scale is 1 when the screen is in portrait mode, and becomes 1.5 when the screen is in landscape orientation. So how do these settings let Safari know? In fact, it is very simple, just a meta, in the form:

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The code is as follows:

Okay, we can lay out our page in full screen, no longer need to worry about the page being displayed very small!

2. Meta format-detection

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The code is as follows:

You clearly wrote a string of numbers without adding a link style, but the iPhone will automatically add a link style to your text, and clicking on the number will automatically dial the number! How to remove this dial-up link? At this time, our meta should show off its magic power again. The code is as follows:

telephone=no disables converting numbers into dial-up links!
telephone=yes enables the conversion of numbers into dial-up links. To enable the conversion function, there is no need to write this meta. It is enabled by default!

3. Meta’s apple-mobile-web-app-capable

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The code is as follows:

The function of this meta is to delete the default Apple toolbar and menu bar. content has two values ​​"yes" and "no". When we need to display the toolbar and menu bar, there is no need to add this line of meta. The default is to display it.

4. Meta of apple-mobile-web-app-status-bar-style

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code As follows:

is used to control the status bar display style

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The code is as follows :

status-bar-style:black
status-bar-style:black-translucent