<s>
In	O
computing	O
,	O
tabbing	B-Application
navigation	I-Application
is	O
the	O
ability	O
to	O
navigate	O
between	O
focusable	O
elements	O
(	O
such	O
as	O
hyperlinks	O
and	O
form	B-General_Concept
controls	O
)	O
within	O
a	O
structured	O
document	O
or	O
user	B-Application
interface	I-Application
(	O
such	O
as	O
HTML	B-Language
)	O
with	O
the	O
tab	O
key	O
of	O
a	O
computer	B-Device
keyboard	I-Device
.	O
</s>
<s>
Usually	O
,	O
pressing	O
will	O
focus	B-Application
on	O
the	O
next	O
element	O
,	O
while	O
pressing	O
+	O
will	O
focus	B-Application
on	O
the	O
previous	O
element	O
.	O
</s>
<s>
The	O
tab	B-Application
order	I-Application
of	O
the	O
graphical	O
control	O
elements	O
on	O
a	O
form	B-General_Concept
determines	O
the	O
sequence	O
in	O
which	O
the	O
focus	B-Application
will	O
change	O
when	O
the	O
user	O
strikes	O
the	O
tab	O
key	O
.	O
</s>
<s>
Usually	O
the	O
tab	B-Application
order	I-Application
is	O
left	O
to	O
right	O
within	O
each	O
row	O
of	O
controls	O
.	O
</s>
<s>
Not	O
all	O
controls	O
can	O
receive	O
the	O
focus	B-Application
.	O
</s>
<s>
In	O
Java	O
,	O
labels	O
can	O
receive	O
focus	B-Application
but	O
in	O
Visual	O
Studio	O
they	O
cannot	O
.	O
</s>
<s>
Also	O
,	O
the	O
TabStop	O
property	O
(	O
in	O
Visual	O
Studio	O
)	O
can	O
be	O
set	O
to	O
false	O
to	O
prevent	O
a	O
control	O
from	O
receiving	O
the	O
focus	B-Application
.	O
</s>
<s>
On	O
web	O
pages	O
,	O
by	O
default	O
,	O
tabbing	O
navigates	O
through	O
form	B-General_Concept
fields	O
(	O
such	O
as	O
text	O
entry	O
)	O
and	O
anchors	O
(	O
such	O
as	O
links	O
)	O
in	O
the	O
order	O
they	O
appear	O
in	O
the	O
character	O
stream	O
(	O
i.e.	O
,	O
in	O
the	O
raw	O
HTML	B-Language
)	O
.	O
</s>
<s>
This	O
can	O
be	O
overridden	O
by	O
the	O
page	O
author	O
using	O
the	O
attribute	O
,	O
or	O
by	O
disabling	O
a	O
form	B-General_Concept
field	O
.	O
</s>
<s>
At	O
the	O
client	O
end	O
,	O
OS	B-Operating_System
X	I-Operating_System
defaults	O
to	O
only	O
focusing	O
text	O
boxes	O
and	O
lists	O
,	O
but	O
this	O
setting	O
can	O
be	O
overridden	O
to	O
allow	O
navigation	O
to	O
all	O
entries	O
(	O
see	O
references	O
)	O
.	O
</s>
<s>
Mozilla	B-Application
Firefox	I-Application
can	O
similarly	O
be	O
customized	O
to	O
include	O
or	O
exclude	O
navigation	O
to	O
text	O
areas	O
,	O
other	O
form	B-General_Concept
elements	O
,	O
and	O
anchors	O
.	O
</s>
<s>
Most	O
desktop	O
applications	O
and	O
web	B-Application
browsers	I-Application
support	O
this	O
kind	O
of	O
keyboard	B-Device
navigation	O
.	O
</s>
<s>
But	O
in	O
some	O
web	B-Application
browsers	I-Application
like	O
Opera	B-Application
,	O
an	O
alternative	O
method	O
known	O
as	O
spatial	O
navigation	O
is	O
used	O
.	O
</s>
<s>
In	O
addition	O
,	O
Mozilla	B-Language
Application	I-Language
Suite	I-Language
and	O
Mozilla	B-Application
Firefox	I-Application
support	O
caret	B-Application
navigation	I-Application
,	O
which	O
provides	O
a	O
more	O
natural	O
way	O
of	O
document	O
navigation	O
similar	O
to	O
mouse	O
navigation	O
.	O
</s>
