You should not use this property in new projects. If you encounter it in existing ones, if you have the time you should remove it and use the visibility property instead.
This property is deprecated in favor of the Layer.visibility property. However, even though it is deprecated some versions of Netscape require that it is forcibly set to false otherwise the visibility property will not function correctly.
If an object is hidden, the gap will not be filled by any surrounding content.
No longer supported in Netscape 6.0.