$ c> transparent $ c>作为 none 不是有效的 background-color p>

CSS 2.1规范为 background-color 属性指定以下内容：

值：< color> |透明|继承

< color> 关键字或颜色的数字表示。 有效的颜色关键字是：

aqua，黑色，蓝色，紫红色，灰色，绿色，紫色，红色，银色，蓝绿色，白色和黄色

transparent inherit 是有效的关键字，但 none 不是。

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: <color> | transparent | inherit

<color> 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.