<s>
i3	O
is	O
a	O
tiling	O
window	B-Application
manager	I-Application
designed	O
for	O
X11	B-Operating_System
,	O
inspired	O
by	O
wmii	B-Language
and	O
written	O
in	O
C	B-Language
.	O
It	O
supports	O
tiling	O
,	O
stacking	O
,	O
and	O
tabbing	O
layouts	O
,	O
which	O
it	O
handles	O
dynamically	B-Operating_System
.	O
</s>
<s>
Its	O
configuration	O
is	O
achieved	O
via	O
a	O
plain	O
text	O
file	O
and	O
extending	O
i3	O
is	O
possible	O
using	O
its	O
Unix	B-Protocol
domain	I-Protocol
socket	I-Protocol
and	O
JSON	B-General_Concept
based	O
IPC	B-Operating_System
interface	O
from	O
many	O
programming	O
languages	O
.	O
</s>
<s>
Like	O
wmii	B-Language
,	O
i3	O
uses	O
a	O
control	O
system	O
very	O
similar	O
to	O
that	O
of	O
vi	B-Application
and	O
Vim	B-Application
.	O
</s>
<s>
By	O
default	O
,	O
window	O
focus	O
is	O
controlled	O
by	O
what	O
the	O
documentation	O
refers	O
to	O
as	O
the	O
'	O
Mod1	O
 '	O
key	O
(	O
Alt	O
key/Windows	O
key	O
)	O
in	O
addition	O
to	O
the	O
right-hand	O
home	O
row	O
keys	O
(	O
Mod1+J	O
,	O
K	O
,	O
L	O
,	O
Semicolon	O
)	O
,	O
while	O
window	O
movement	O
is	O
controlled	O
by	O
the	O
addition	O
of	O
the	O
Shift	B-Device
key	I-Device
(	O
Mod1+Shift+J	O
,	O
K	O
,	O
L	O
,	O
Semicolon	O
)	O
.	O
</s>
<s>
i3	O
's	O
primary	O
design	O
goals	O
are	O
to	O
possess	O
well-written	O
,	O
documented	O
code	O
that	O
encourages	O
user	O
contribution	O
;	O
to	O
use	O
XCB	B-Language
instead	O
of	O
Xlib	B-Language
;	O
to	O
implement	O
multi-monitor	O
features	O
correctly	O
,	O
so	O
that	O
each	O
workspace	O
is	O
assigned	O
to	O
a	O
virtual	O
screen	O
,	O
and	O
monitor	O
additions	O
and	O
removals	O
are	O
non-destructive	O
of	O
windows	O
;	O
to	O
implement	O
different	O
modes	B-General_Concept
,	O
similar	O
to	O
the	O
text	O
editors	O
vi	B-Application
and	O
vim	B-Application
;	O
to	O
use	O
a	O
tree	O
as	O
the	O
abstraction	O
(	O
and	O
underlying	O
data	O
structure	O
)	O
for	O
window	B-Application
management	I-Application
;	O
and	O
to	O
implement	O
UTF-8	O
character	O
encoding	O
.	O
</s>
<s>
Contrary	O
to	O
other	O
popular	O
tiling	O
window	B-Application
managers	I-Application
,	O
such	O
as	O
dwm	B-Language
,	O
awesome	B-Language
,	O
and	O
xmonad	B-Device
,	O
window	B-Application
management	I-Application
is	O
left	O
to	O
the	O
user	O
in	O
i3	O
.	O
</s>
<s>
i3	O
also	O
has	O
an	O
associated	O
program	O
called	O
i3bar	B-Application
that	O
displays	O
information	O
about	O
the	O
system	O
at	O
the	O
bottom	O
of	O
the	O
screen	O
.	O
</s>
<s>
Even	O
though	O
i3	O
is	O
a	O
tiling	O
window	B-Application
manager	I-Application
,	O
specific	O
windows	O
,	O
such	O
as	O
password	O
pop-ups	O
,	O
are	O
not	O
displayed	O
as	O
new	O
tiles	O
by	O
default	O
;	O
they	O
are	O
always	O
stacked	O
in	O
front	O
of	O
tiled	O
windows	O
,	O
unless	O
in	O
full	O
screen	O
mode	O
.	O
</s>
<s>
These	O
floating	O
windows	O
can	O
be	O
moved	O
and	O
resized	O
freely	O
,	O
just	O
as	O
they	O
can	O
in	O
stacking	B-Device
window	I-Device
managers	I-Device
and	O
popular	O
desktop	O
environments	O
like	O
GNOME	B-Application
or	O
KDE	O
Plasma	O
.	O
</s>
