Attribute for <IMG ...>
LONGDESC = "URL"

LONGDESC gives the URL of a long description of the image. LONGDESC is poorly supported. If you want to give a long description of an image use a "D Link". A D Link is the letter D in brackets in a link to a long description:

<IMG SRC="../graphics/sfjasmine2.jpg" HEIGHT=327 WIDTH=291 ALT="Starflower and Jasmine">
[<A HREF="longdescsfj.html" TARGET="_top">D</A>]

which gives us

[D]