CSS3 Transparent Properties Opacity

Example:

 <  div  id  = "Fixhovertree"   style  = "Position:fixed;left:100px;width:120px;top:100px;opacity:0.5;background-color: Silver;color:red " >  q <  Span style= "color: #800000;" >a  href    target  =" _blank "  >  effect </ a  >  </ div  >  

View results: http://hovertree.com/hvtart/bjae/q3etb2qv.htm

To set the opacity level of a DIV element:
Div
{
opacity:0.5;
}


The Opacity property sets the opacity level of the element.
Default value: 1
Inheritance: No
Version: CSS3
JavaScript Syntax: object.style.opacity=0.5

value specifies the opacity. From 0.0 (fully transparent) to 1.0 (completely opaque).

Inherit should inherit the value of the Opacity property from the parent element.

Blog Park Roucheng JS,JQUERY,CSS,HTML5 special effects http://www.cnblogs.com/roucheng/p/texiao.html

CSS3 Transparent Properties Opacity