使用CSS3将你的网站设计推向未来

1. rgba(200, 54, 54, 0.5);   
2. /* example: */  
3. background: rgba(200, 54, 54, 0.5);   
4. /* or */  
5. color: rgba(200, 54, 54, 0.5);  

        rgba(200, 54, 54, 0.5);
        /* example: */
        background: rgba(200, 54, 54, 0.5);
        /* or */
        color: rgba(200, 54, 54, 0.5);

The first three numbers refer to the red, green and blue color channels, and the final value refers to the alpha channel that produces the transparency effect.

Alternatively, with the opacity rule, the color can be specified as usual, with the opacity value set as a separate rule:

1. color: #000;   
2. opacity: 0.5;  

          color: #000;
          opacity: 0.5;

Supported in Firefox, Safari, Chrome, Opera (opacity) and IE7 (opacity, with fixes).

As used by: 24 Ways (RGBA).

See also:

• W3C Wo***ng Draft
• RGBA on CSS3.info
• Pure CSS Opacity

5. Custom Web Fonts with @Font-Face

There has always been a set of safe fonts that can be used on the Web, as you know: Arial, Helvetica, Verdana, Georgia, Comic Sans (ahem…), etc. Now the @font-face CSS3 rule allows fonts to be called from an online directory and used to display text in a whole new light. This does bring up issues of copyright, so there are only a handful of specific fonts that can be used for @font-face embedding.

The styling is put into practice like so:

1. @font-face {   
2. font-family:''Anivers'';   
3. src: url(''/images/Anivers.otf'') format(''opentype'');   
4. }  

        @font-face {
        font-family:''Anivers'';
        src: url(''/images/Anivers.otf'') format(''opentype'');
        }

The rest of the font family, containing secondary options, is then called

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