CSS3 Supports RGBA Colors

I've always been using the RGB, Reg-Green-Blue, color model when teaching HTML and CSS. It's interesting that now with CSS3 a new fourth letter has been introduced to the popular three, namely the letter 'A'. With CSS3, one can specify colors using 4 values instead of 3. The fourth value 'A' stands for Alpha. CSS3's support for RGBA color values will make life way easier for web designers. However, we'll have to wait till browsers fully adopt CSS3 and users actually use those new versions of the browsers.