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Examples of CSS defining the background transparency of a website page

Source: Internet
Author: User
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Thanks to @ Lin Xiaozhi's blog, let me know that the IE transition filter + CSS3 rgba can be perfectly implemented.
The specific implementation code is as follows:

The code is as follows: Copy code

. Transparent {
Background: rgba (0, 0, 0, 0.3 );
Filter: progid: DXImageTransform. Microsoft. Gradient (GradientType = 0, StartColorStr = '# 4c000000', EndColorStr =' #4c000000 ');
}

: Root. transparent {
Filter: progid: DXImageTransform. Microsoft. Gradient (GradientType = 0, StartColorStr = '#00000000', EndColorStr = '#00000000 ');
}

Tip: IE9 supports the filter and rgba attributes, which will double the background transparency!
Solution: Use the root pseudo class to write HACK separately for IE9 and reduce its transparency to 0.

I. No translucent style instance is set

The code is as follows: Copy code

<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "UTF-8"/>
<Title> css background translucent www.111cn.net </title>
<Style>
. Div-a {background: url(div-a-bg.png) no-repeat; width: 230px; height: 136px; padding: 10px ;}
. Div-B {background: #000; width: 200px; height: 100px; padding: 5px; color: # F00}
</Style>
</Head>
<Body>
<Div class = "div-a">
<Div class = "div-B"> DIV translucent instance demonstration </div>
</Div>
</Body>
</Html>


2. Set a CSS translucent style instance for the DIV
Add the translucent style code to the ". div-B" selector: filter: alpha (Opacity = 60);-moz-opacity: 0.6; opacity: 0.6;

The code is as follows: Copy code

<! DOCTYPE html>
<Html>
<Head>
<Meta charset = "UTF-8"/>
<Title> css background translucent www.111cn.net </title>
<Style>
. Div-a {background: url(div-a-bg.png) no-repeat; width: 230px; height: 136px; padding: 10px}
. Div-B {background: #000; width: 200px; height: 100px; padding: 5px; color: # F00;
Filter: alpha (Opacity = 60);-moz-opacity: 0.6; opacity: 0.6}
/* CSS comments: here the CSS code line feed is used to display the complete code here. The CSS effect is not affected after the line feed */
</Style>
</Head>
<Body>
<Div class = "div-a">
<Div class = "div-B"> demonstration of DIV translucent instances </div>
</Div>
</Body>
</Html>

Note:
1. filter: sets the translucent filter effect for win ie. filter: alpha (Opacity = 80) indicates that the object is 80% translucent, which is not recognized by Firefox.
2.-moz-opacity: translucent to mozilla firefoxfirefox. win IE does not recognize this attribute.-moz-opacity: 0.5 is equivalent to setting translucent to 50%.
3. opacity: supports all browsers except Internet Explorer, including Google, and finally focuses on Google browsers. opacity: 0.5 indicates that the browser is 50% translucent.

To observe the DIV translucent implementation, we set two DIV layers, one placed in the other DIV layer, and the outer DIV is named ". div-a "; the CSS class of the contained layer is named". div-B "to form". div-B "box placed in". inside div-

We set a background image for the underlying DIV, and the DIV box above sets the village black.

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