OVERLAY
Description
The OVERLAY element is used to overlay one or more images
on top of a FIG image.
The X and Y attributes identify the offsets from the top left
of the FIG where the top left of the overlay will be placed.
Minimum Attributes
<OVERLAY SRC="...">
All Possible Attributes
<OVERLAY SRC="..."
MD="..."
UNITS=pixels|en
X=value
Y=value
WIDTH=value
HEIGHT=value
IMAGEMAP="...">
Elements Allowed Within...
The OVERLAY element is defined as having no content.
Allowed In Content Of...
Variations
The OVERLAY element is proposed in Version 3 as part of
the construct.
It is designed to take advantage of the caching system of most browsers
for a series of similar images which may only differ by an overlay
and the rest is already in cache.
