Default behavior for a layer is to be transparent. If the CLIP attribute is omitted, the clipping rectangle of a layer is the same size as the HTML content of the layer. A layer will expand to contain all of its content by default. This parameters specifies the height of the layer's content and serves as a reference dimension for child layers. This attribute specifies the name of the layer in order to identify or reference it from other layers or scripting languages.
Layers are unnamed by default.
A blur Event Handler executes Script code when a layer loses keyboard focus. A mouseOut Event Handler executes Script code once each time the mouse pointer exits from the bounds of a layer from inside the layer. This attribute specifies the URL of an HTML 'sub-document' to be inserted in to the layer. A layer will have the same visibility as its parent layer by default. Even if the visibility of a layer is set to SHOW, a layer can only be seen if there are no other visible, solid layers stacked on top of it.