Does trans still work in all browsers

Well someone was saying this script

opacity: 0.5;

Code (markup):

Was going to be not included in new browsers is this still the case?
Thanks
Ross

 

opacity is part of CSS3. It most definitely will be in browsers.

 

Thanks very much, thats all i need to know

 

Right,

I just checked this out on another website and it seems the opacity isnt working with some internet explorers how would i solve this?
Ross

 

opacity is too advanced for any version of IE and only works in modern browsers. This article will explain Microsoft's typical backwardness and ways around it.

 

HMM, thats rather hardddd. i will try if not maybe disable users using IE 7 and below?