<s>
In	O
HTML	B-Language
and	O
XHTML	B-Language
,	O
an	O
image	B-General_Concept
map	I-General_Concept
is	O
a	O
list	O
of	O
coordinates	O
relating	O
to	O
a	O
specific	O
image	O
,	O
created	O
in	O
order	O
to	O
hyperlink	O
areas	O
of	O
the	O
image	O
to	O
different	O
destinations	O
(	O
as	O
opposed	O
to	O
a	O
normal	O
image	O
link	O
,	O
in	O
which	O
the	O
entire	O
area	O
of	O
the	O
image	O
links	O
to	O
a	O
single	O
destination	O
)	O
.	O
</s>
<s>
The	O
intention	O
of	O
an	O
image	B-General_Concept
map	I-General_Concept
is	O
to	O
provide	O
an	O
easy	O
way	O
of	O
linking	O
various	O
parts	O
of	O
an	O
image	O
without	O
dividing	O
the	O
image	O
into	O
separate	O
image	O
files	O
.	O
</s>
<s>
Server-side	O
image	B-General_Concept
maps	I-General_Concept
were	O
first	O
supported	O
in	O
Mosaic	B-Application
(	O
web	B-Application
browser	I-Application
)	O
version	O
1.1	O
.	O
</s>
<s>
Server-side	O
image	B-General_Concept
maps	I-General_Concept
enable	O
the	O
web	B-Application
browser	I-Application
to	O
send	O
positional	O
information	O
to	O
the	O
server	O
about	O
where	O
the	O
user	O
clicks	O
within	O
an	O
image	O
.	O
</s>
<s>
The	O
HTML	B-Language
code	I-Language
for	O
this	O
type	O
of	O
server-side	O
image	B-General_Concept
map	I-General_Concept
requires	O
the	O
tag	O
to	O
be	O
inside	O
an	O
anchor	O
tag	O
...	O
and	O
the	O
must	O
include	O
the	O
ismap	O
attribute	O
.	O
</s>
<s>
When	O
the	O
user	O
clicks	O
inside	O
the	O
image	O
the	O
browser	B-Application
will	O
append	O
the	O
X	O
and	O
Y	O
coordinates	O
(	O
relative	O
to	O
the	O
upper-left	O
corner	O
of	O
the	O
image	O
)	O
to	O
the	O
anchor	O
URL	O
as	O
a	O
query	B-Protocol
string	I-Protocol
and	O
will	O
access	O
the	O
resulting	O
URL	O
(	O
for	O
example	O
,	O
/imagemapper	O
?	O
3	O
,	O
9	O
)	O
.	O
</s>
<s>
If	O
the	O
browser	B-Application
does	O
not	O
support	O
ismap	O
then	O
the	O
query	B-Protocol
string	I-Protocol
must	O
not	O
be	O
added	O
to	O
the	O
anchor	O
URL	O
and	O
the	O
server	O
should	O
respond	O
appropriately	O
(	O
for	O
example	O
,	O
by	O
returning	O
a	O
text-only	O
navigation	O
page	O
)	O
.	O
</s>
<s>
Client-side	O
image	B-General_Concept
maps	I-General_Concept
were	O
introduced	O
in	O
HTML	B-Language
3.2	O
,	O
and	O
do	O
not	O
require	O
any	O
special	O
logic	O
to	O
be	O
executed	O
on	O
the	O
server	O
(	O
they	O
are	O
fully	O
client-side	O
)	O
.	O
</s>
<s>
They	O
also	O
do	O
not	O
require	O
any	O
JavaScript	B-Language
.	O
</s>
<s>
A	O
client-side	O
imagemap	B-General_Concept
in	O
HTML	B-Language
consists	O
of	O
two	O
parts	O
:	O
</s>
<s>
The	O
image	O
tag	O
must	O
have	O
an	O
attribute	O
usemap	O
,	O
which	O
names	O
the	O
imagemap	B-General_Concept
to	O
use	O
for	O
this	O
image	O
(	O
multiple	O
imagemaps	B-General_Concept
may	O
exist	O
on	O
a	O
single	O
page	O
)	O
.	O
</s>
<s>
A	O
<map> element, and inside that, <area>	O
elements	O
,	O
each	O
of	O
which	O
defines	O
a	O
single	O
clickable	O
area	O
within	O
the	O
imagemap	B-General_Concept
.	O
</s>
<s>
A	O
more	O
modern	O
approach	O
is	O
to	O
overlay	O
links	O
on	O
an	O
image	O
using	O
CSS	B-Language
absolute	O
positioning	O
;	O
however	O
,	O
this	O
only	O
supports	O
rectangular	O
clickable	O
areas	O
.	O
</s>
<s>
This	O
CSS	B-Language
technique	O
may	O
be	O
suitable	O
for	O
making	O
an	O
image	B-General_Concept
map	I-General_Concept
work	O
properly	O
on	O
iPhones	B-Device
,	O
which	O
can	O
fail	O
to	O
rescale	O
pure	O
HTML	B-Language
image	B-General_Concept
maps	I-General_Concept
correctly	O
.	O
</s>
<s>
It	O
is	O
possible	O
to	O
create	O
client-side	O
image	B-General_Concept
maps	I-General_Concept
by	O
hand	O
using	O
a	O
text	O
editor	O
,	O
but	O
doing	O
so	O
requires	O
web	O
designers	O
to	O
know	O
how	O
to	O
code	O
HTML	B-Language
as	O
well	O
as	O
how	O
to	O
enumerate	O
the	O
coordinates	O
of	O
the	O
areas	O
they	O
wish	O
to	O
place	O
over	O
the	O
image	O
.	O
</s>
<s>
As	O
a	O
result	O
,	O
most	O
image	B-General_Concept
maps	I-General_Concept
coded	O
by	O
hand	O
are	O
simple	O
polygons	O
.	O
</s>
<s>
Because	O
creating	O
image	B-General_Concept
maps	I-General_Concept
in	O
a	O
text	O
editor	O
requires	O
much	O
time	O
and	O
effort	O
,	O
many	O
applications	O
have	O
been	O
designed	O
to	O
allow	O
web	O
designers	O
to	O
create	O
image	B-General_Concept
maps	I-General_Concept
quickly	O
and	O
easily	O
,	O
much	O
as	O
they	O
would	O
create	O
shapes	O
in	O
a	O
vector	B-Application
graphics	I-Application
editor	I-Application
.	O
</s>
<s>
Examples	O
of	O
these	O
applications	O
are	O
Adobe	O
's	O
Dreamweaver	B-Language
or	O
KImageMapEditor	B-Language
(	O
for	O
KDE	B-Application
)	O
,	O
and	O
the	O
imagemap	B-General_Concept
plugin	O
found	O
in	O
GIMP	B-Application
.	O
</s>
<s>
Image	B-General_Concept
maps	I-General_Concept
which	O
do	O
not	O
make	O
their	O
clickable	O
areas	O
obvious	O
risk	O
subjecting	O
the	O
user	O
to	O
mystery	O
meat	O
navigation	O
.	O
</s>
<s>
Because	O
the	O
Scalable	B-Application
Vector	I-Application
Graphics	I-Application
(	O
SVG	B-Application
)	O
image	O
format	O
provides	O
its	O
own	O
mechanisms	O
for	O
adding	O
hyperlinks	O
and	O
other	O
,	O
more	O
sophisticated	O
forms	O
of	O
interactivity	O
to	O
images	O
,	O
traditional	O
image	B-General_Concept
map	I-General_Concept
techniques	O
are	O
generally	O
not	O
necessary	O
when	O
working	O
with	O
vector	O
images	O
in	O
the	O
SVG	B-Application
format	I-Application
.	O
</s>
