Question

I want to make something just like on this site (when you/or somebody else adds an answer)

the answer appears and fades in and comes from orange to transparent, anybody knows how ?

Answer 1

You can get the color plugin and animate the background color of whatever element you want, like this:

$("#myDiv").animate({ backgroundColor: "white" }, 1000);

This will fade it from whatever color you set it to initially (or via .css() just before the animate) to the color you specify over 1 second. You can try the other color plugin demos here.