Is background-color:none valid CSS?

Question

Can anyone tell me if the following CSS is valid?

.class {
    background-color:none;
}

Answer 1

So, I would like to explain the scenario where I had to make use of this solution. Basically, I wanted to undo the background-color attribute set by another CSS. The expected end result was to make it look as though the original CSS had never applied the background-color attribute . Setting background-color:transparent; made that effective.