<s>
Twine	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
tool	O
created	O
by	O
Chris	O
Klimas	O
for	O
making	O
interactive	O
fiction	O
and	O
hypertext	O
fiction	O
in	O
the	O
form	O
of	O
web	O
pages	O
.	O
</s>
<s>
It	O
is	O
available	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
,	O
Windows	O
,	O
and	O
Linux	B-Application
.	O
</s>
<s>
Twine	B-Application
emphasizes	O
the	O
visual	O
structure	O
of	O
hypertext	O
,	O
and	O
does	O
not	O
require	O
knowledge	O
of	O
a	O
programming	O
language	O
as	O
many	O
other	O
game	O
development	O
tools	O
do	O
.	O
</s>
<s>
Twine	B-Application
2	O
is	O
a	O
browser-based	B-Application
application	O
written	O
in	O
HTML5	B-Application
and	O
Javascript	B-Language
,	O
also	O
available	O
as	O
a	O
standalone	O
desktop	O
app	O
;	O
it	O
also	O
supports	O
CSS	B-Language
.	O
</s>
<s>
Rather	O
than	O
using	O
a	O
fixed	O
scripting	O
language	O
,	O
Twine	B-Application
supports	O
the	O
use	O
of	O
different	O
"	O
story	O
formats	O
"	O
.	O
</s>
<s>
In	O
Twine	B-Application
1	O
,	O
these	O
mostly	O
affected	O
how	O
a	O
story	O
was	O
displayed	O
rather	O
than	O
how	O
it	O
was	O
written	O
,	O
but	O
Twine	B-Application
2	O
story	O
formats	O
combine	O
style	O
,	O
semantic	O
rules	O
and	O
markup	O
conventions	O
and	O
are	O
described	O
as	O
"	O
dialects	O
"	O
of	O
the	O
Twine	B-Application
language	O
.	O
</s>
<s>
There	O
are	O
many	O
story	O
formats	O
;	O
they	O
include	O
Harlowe	O
(	O
the	O
default	O
format	O
for	O
Twine	B-Application
2	O
)	O
,	O
SugarCube	O
(	O
based	O
on	O
the	O
original	O
format	O
used	O
by	O
Twine	B-Application
1	O
)	O
,	O
Snowman	O
(	O
which	O
integrates	O
JavaScript	B-Language
libraries	O
into	O
Twine	B-Application
)	O
and	O
Chapbook	O
(	O
a	O
"	O
second	O
generation	O
"	O
format	O
created	O
and	O
maintained	O
by	O
Twine	B-Application
creator	O
Chris	O
Klimas	O
)	O
.	O
</s>
<s>
Twine	B-Application
2	O
also	O
supports	O
"	O
proofing	O
formats	O
"	O
,	O
which	O
are	O
designed	O
to	O
output	O
Twine	B-Application
content	O
in	O
a	O
variety	O
of	O
ways	O
to	O
allow	O
for	O
on-screen	O
proofing	O
and	O
error	O
checking	O
,	O
as	O
well	O
as	O
conversion	O
of	O
Twine	B-Application
stories	O
into	O
other	O
formats	O
.	O
</s>
<s>
Twine	B-Application
was	O
used	O
by	O
writer	O
Charlie	O
Brooker	O
in	O
developing	O
the	O
interactive	O
film	O
Black	O
Mirror	O
:	O
Bandersnatch	O
.	O
</s>
