<s>
A	O
visual	B-Application
editor	I-Application
is	O
computer	B-Application
software	I-Application
for	O
editing	O
text	B-Protocol
files	I-Protocol
using	O
a	O
textual	B-Application
or	O
graphical	B-Application
user	I-Application
interface	I-Application
that	O
normally	O
renders	O
the	O
content	O
(	O
text	O
)	O
in	O
accordance	O
with	O
embedded	O
markup	O
code	O
,	O
e.g.	O
,	O
,	O
Wikitext	O
,	O
rather	O
than	O
displaying	O
the	O
raw	O
text	O
.	O
</s>
<s>
Edits	O
made	O
to	O
the	O
page	O
appear	O
in	O
real	O
time	O
,	O
correctly	O
formatted	O
,	O
and	O
are	O
often	O
referred	O
to	O
as	O
WYSIWYG	B-Application
(	O
What	B-Application
You	I-Application
See	I-Application
Is	I-Application
What	I-Application
You	I-Application
Get	I-Application
)	O
.	O
</s>
<s>
It	O
is	O
common	O
for	O
the	B-Application
software	I-Application
to	O
permit	O
switching	O
to	O
source-code	B-Application
editor	I-Application
mode	O
so	O
that	O
the	O
original	O
source	O
code	O
can	O
be	O
viewed	O
or	O
modified	O
.	O
</s>
<s>
By	O
definition	O
,	O
all	O
visual	B-Application
editors	I-Application
require	O
a	O
re-fresh-able	O
display	O
device	O
.	O
</s>
<s>
However	O
,	O
some	O
editors	O
using	O
such	O
devices	O
,	O
e.g.	O
,	O
BRIEF	B-Application
,	O
ISPF	B-Operating_System
,	O
gVim	B-Application
,	O
KEDIT	B-Application
,	O
THE	O
,	O
XEDIT	B-Application
,	O
are	O
not	O
visual	B-Application
editors	I-Application
.	O
</s>
