<s>
Stylus	B-Application
is	O
a	O
dynamic	O
stylesheet	O
preprocessor	B-General_Concept
language	O
that	O
is	O
compiled	O
into	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
(	O
CSS	B-Language
)	O
.	O
</s>
<s>
Its	O
design	O
is	O
influenced	O
by	O
Sass	B-Language
and	O
LESS	B-Language
.	O
</s>
<s>
It	O
is	O
regarded	O
as	O
the	O
fourth	O
most	O
used	O
CSS	B-Language
preprocessor	B-General_Concept
syntax	O
.	O
</s>
<s>
It	O
was	O
created	O
by	O
TJ	O
Holowaychuk	O
,	O
a	O
former	O
programmer	O
for	O
Node.js	B-Language
and	O
the	O
creator	O
of	O
the	O
Luna	O
language	O
.	O
</s>
<s>
It	O
is	O
written	O
in	O
JADE	B-Language
and	O
Node.js	B-Language
.	O
</s>
<s>
Unlike	O
CSS	B-Language
,	O
which	O
uses	O
braces	O
to	O
open	O
and	O
close	O
declaration	O
blocks	O
,	O
indentation	O
is	O
used	O
.	O
</s>
<s>
Hence	O
,	O
the	O
following	O
CSS	B-Language
:	O
</s>
<s>
Stylus	B-Application
allows	O
variables	O
to	O
be	O
defined	O
,	O
however	O
unlike	O
LESS	B-Language
and	O
Sass	B-Language
,	O
it	O
does	O
n't	O
use	O
a	O
symbol	O
to	O
define	O
variables	O
.	O
</s>
<s>
In	O
this	O
way	O
,	O
variables	O
are	O
similar	O
to	O
the	O
variables	O
in	O
Python	B-Language
.	O
</s>
<s>
The	O
Stylus	B-Application
compiler	O
would	O
translate	O
the	O
above	O
document	O
to	O
:	O
</s>
<s>
For	O
example	O
,	O
if	O
you	O
wanted	O
to	O
define	O
the	O
CSS	B-Language
border	O
radius	O
property	O
without	O
having	O
to	O
use	O
various	O
Vendor	O
Prefixes	O
you	O
can	O
create	O
:	O
</s>
