Can anyone tell me if the following CSS is valid?
.class {
background-color:none;
}
You probably want transparent as none is not a valid background-color value.
The CSS 2.1 spec states the following for the background-color property:
Value:| transparent | inherit
can be either a keyword or a numerical representation of a colour. Valid color keywords are:
aqua, black, blue, fuchsia, gray, green, lime, maroon, navy, olive, orange, purple, red, silver, teal, white, and yellow
transparent and inherit are valid keywords in their own right, but none is not.