How do I give text or an image a transparent background using CSS?


Is it possible, using CSS only, to make the background of an element semi-transparent but have the content (text & images) of the element opaque?
I'd like to accomplish this without having the text and the background as two separate elements.
When trying:
p {
  position: absolute;
  background-color: green;
  filter: alpha(opacity=60);
  opacity: 0.6;
}

span {
  color: white;
  filter: alpha(opacity=100);
  opacity: 1;
}
<p>
  <span>Hello world</span>
</p>


It looks like child elements are subjected to the opacity of their parents, so opacity:1 is relative to the opacity:0.6 of the parent.


Answer: 

Either use a semi-transparent PNG image or use CSS3:
background-color:rgba(255,0,0,0.5);
Here's an article from css3.info, Opacity, RGBA and compromise (2007-06-03).




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