Do not use special characters such as spaces, hyphens, slashes, or periods. L and T Specify the position of the layer relative to the top left corner of the page or parent layer. W and H Specify the width and height of the layer. These values are overridden if the content of the layer exceeds the specified size. The Overflow setting controls how CSS layers react when the content exceeds the layer's size.
Values can be positive or negative.
It's easier to change the stacking order of layers using the Layer palette than to enter specific z-index values. See Changing the stacking order of layers . When you select a Netscape layer, two additional options appear in the lower right corner of the Property inspector. Vis Determines the initial display condition of the layer. Use a scripting language, such as JavaScript, to control the visibility property and dynamically display layer contents.