What's the easiest way to do it? I know CSS could just set background color of text very easily. And fireworks was able to do that. But I can't make it work now. I know there is a harder way: putting a rectangle below the text. Or putting the text inside the rectangle.
There is no text box colour in Photoshop. The only way is to draw rectangular shape layer below the text layer (you could also use a bitmap layer).
Yep, that's different to some other design software.