HTML and CSS Reference
In-Depth Information
nonbreaking space
) before including our conventional doc-
ument text.
This is important enough to repeat: normal document content following
a
<layer>
tag is positioned directly under the layer it follows. You can
circumvent this effect using an inline layer, described in "
The <ilayer>
Tag (Antiquated)
" section later in this chapter.
H.3.1.3. The above, below, and z-index attributes
Layers exist in three dimensions, occupying space on the page and
stacked on top of one another as well as on top of conventional docu-
ment content. As we mentioned earlier, layers normally are stacked in
order of their appearance in the document: layers at the beginning get
covered by later layers in the same display area.
You can control the stacking order of the layers with the
above
,
below
,
and
z-index
attributes for the
<layer>
tag. These attributes are mutually
exclusive; use only one per layer.
The value for the
above
or
below
attribute is the name of another layer
in the current document. Of course, that referenced layer must have a
name
attribute whose value is the same name you use with the
above
or
below
attribute in the referring
<layer>
tag. You also must have created
the referenced layer earlier in the document; you cannot refer to a layer
that comes later.
In direct contradiction with what you might expect, Netscape 4 puts the
current layer below the
above
-named layer and above the
below
-named
space for you to see any effects.
[*]
One cannot help but imagine that the
above
and
below
attributes were implemented in the wee
hours.
Let's use our drop-shadow layer example again to illustrate the
above
attribute:
