<s>
Curl	B-Language
is	O
a	O
reflective	B-Language
object-oriented	B-Language
programming	I-Language
language	I-Language
for	O
interactive	O
web	B-Application
applications	I-Application
whose	O
goal	O
is	O
to	O
provide	O
a	O
smoother	O
transition	O
between	O
formatting	O
and	O
programming	O
.	O
</s>
<s>
The	O
Curl	B-Language
implementation	O
initially	O
consisted	O
of	O
just	O
an	O
interpreter	O
,	O
but	O
a	O
compiler	O
was	O
added	O
later	O
.	O
</s>
<s>
Curl	B-Language
combines	O
text	O
markup	O
(	O
as	O
in	O
HTML	B-Language
)	O
,	O
scripting	O
(	O
as	O
in	O
JavaScript	B-Language
)	O
,	O
and	O
heavy-duty	O
computing	O
(	O
as	O
in	O
Java	B-Language
,	O
C#	B-Application
,	O
or	O
C++	B-Language
)	O
within	O
one	O
unified	O
framework	O
.	O
</s>
<s>
Curl	B-Language
programs	O
may	O
be	O
compiled	O
into	O
Curl	B-Language
applets	O
,	O
that	O
are	O
viewed	O
using	O
the	O
Curl	B-Language
RTE	O
,	O
a	O
runtime	B-Device
environment	I-Device
with	O
a	O
plugin	B-Application
for	O
web	B-Application
browsers	I-Application
.	O
</s>
<s>
Currently	O
,	O
it	O
is	O
supported	O
on	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
Linux	B-Application
,	O
and	O
macOS	B-Application
was	O
dropped	O
on	O
March	O
25	O
,	O
2019	O
(	O
starting	O
with	O
version	O
8.0.8	O
)	O
.	O
</s>
<s>
Curl	B-Language
supports	O
,	O
which	O
is	O
a	O
web	O
deployed	O
applet	O
which	O
runs	O
on	O
the	O
user	O
's	O
desktop	O
independent	O
of	O
a	O
browser	B-Application
window	O
much	O
as	O
in	O
Silverlight	B-Application
3	I-Application
and	O
Adobe	B-Operating_System
AIR	I-Operating_System
.	O
</s>
<s>
The	O
Curl	B-Language
language	O
attempts	O
to	O
address	O
a	O
long-standing	O
problem	O
:	O
the	O
different	O
building	O
blocks	O
that	O
make	O
up	O
any	O
modern	O
web	O
document	O
most	O
often	O
require	O
wildly	O
different	O
methods	O
of	O
implementation	O
:	O
different	O
languages	O
,	O
different	O
tools	O
,	O
different	O
frameworks	O
,	O
often	O
completely	O
different	O
teams	O
.	O
</s>
<s>
Curl	B-Language
attempts	O
to	O
side-step	O
these	O
problems	O
by	O
providing	O
a	O
consistent	O
syntactic	O
and	O
semantic	O
interface	O
at	O
all	O
levels	O
of	O
web	O
content	O
creation	O
:	O
from	O
simple	O
HTML	B-Language
to	O
complex	O
object-oriented	B-Language
programming	I-Language
.	O
</s>
<s>
Curl	B-Language
is	O
a	O
markup	O
language	O
like	O
HTML	B-Language
—	O
that	O
is	O
,	O
plain	O
text	O
is	O
shown	O
as	O
text	O
;	O
at	O
the	O
same	O
time	O
,	O
Curl	B-Language
includes	O
an	O
object-oriented	B-Language
programming	I-Language
language	I-Language
that	O
supports	O
multiple	B-Application
inheritance	I-Application
.	O
</s>
<s>
Curl	B-Language
applications	O
are	O
not	O
required	O
to	O
observe	O
the	O
separation	O
of	O
information	O
,	O
style	O
,	O
and	O
behavior	O
that	O
HTML	B-Language
,	O
Cascading	B-Language
Style	I-Language
Sheets	I-Language
(	O
CSS	B-Language
)	O
,	O
and	O
JavaScript	B-Language
have	O
imposed	O
,	O
although	O
that	O
style	O
of	O
programming	O
can	O
be	O
used	O
in	O
Curl	B-Language
if	O
desired	O
.	O
</s>
<s>
While	O
the	O
Curl	B-Language
language	O
can	O
be	O
used	O
as	O
an	O
HTML	B-Language
replacement	O
for	O
presenting	O
formatted	O
text	O
,	O
its	O
abilities	O
range	O
all	O
the	O
way	O
to	O
those	O
of	O
a	O
compiled	O
,	O
strongly	O
typed	O
,	O
object-oriented	B-Language
system	O
programming	O
language	O
.	O
</s>
<s>
Both	O
the	O
authoring	O
(	O
HTML-level	O
)	O
and	O
programming	O
constructs	O
of	O
Curl	B-Language
can	O
be	O
extended	O
in	O
user	O
code	O
.	O
</s>
<s>
The	O
language	O
is	O
designed	O
so	O
Curl	B-Language
applications	O
can	O
be	O
compiled	O
to	O
native	O
code	O
of	O
the	O
client	O
machine	O
by	O
a	O
just-in-time	O
compiler	O
and	O
run	O
at	O
high	O
speed	O
.	O
</s>
<s>
Curl	B-Language
applets	O
can	O
also	O
be	O
written	O
so	O
that	O
they	O
will	O
run	O
off-line	O
when	O
disconnected	O
from	O
the	O
network	O
(	O
)	O
.	O
</s>
<s>
In	O
fact	O
,	O
the	O
is	O
an	O
application	O
written	O
in	O
Curl	B-Language
.	O
</s>
<s>
This	O
code	O
will	O
run	O
if	O
the	O
user	O
has	O
at	O
least	O
one	O
of	O
the	O
Curl	B-Language
versions	O
7.0	O
or	O
8.0	O
installed	O
.	O
</s>
<s>
Curl	B-Language
provides	O
both	O
macros	O
and	O
text-procedures	O
in	O
addition	O
to	O
anonymous	O
procedures	O
and	O
named	O
methods	O
.	O
</s>
<s>
Recently	O
this	O
style	O
of	O
layout	O
has	O
been	O
adopted	O
by	O
"	O
builders	O
"	O
in	O
the	O
Groovy	B-Application
language	I-Application
for	O
the	O
JVM	O
,	O
but	O
is	O
also	O
familiar	O
to	O
users	O
of	O
CSS	B-Language
or	O
Tcl/Tk	O
.	O
</s>
<s>
Most	O
features	O
for	O
web	B-Application
applications	I-Application
now	O
implemented	O
through	O
combinations	O
of	O
JavaScript	B-Language
libraries	O
+	O
HTML	B-Language
+	O
CSS	B-Language
are	O
already	O
found	O
within	O
the	O
Curl	B-Language
language	O
,	O
including	O
features	O
usually	O
associated	O
with	O
Prototype	B-Language
+	O
script.aculo.us	B-Language
such	O
as	O
accordion	O
panes	O
.	O
</s>
<s>
Curl	B-Language
sets	O
callbacks	O
in	O
the	O
manner	O
also	O
adopted	O
by	O
Groovy	B-Application
:	O
</s>
<s>
Curl	B-Language
comments	O
use	O
the	O
vertical	O
bar	O
in	O
several	O
variations	O
.	O
</s>
<s>
Because	O
Curl	B-Language
provides	O
for	O
both	O
user-defined	O
text	O
procedures	O
and	O
stylesheets	O
,	O
Curl	B-Language
can	O
be	O
used	O
readily	O
as	O
domain-specific	O
lightweight	O
markup	O
.	O
</s>
<s>
A	O
major	O
advantage	O
over	O
plain	O
text	O
HTML	B-Language
markup	O
is	O
that	O
the	O
text	O
encoding	O
can	O
be	O
set	O
to	O
UTF-8	O
,	O
and	O
text	O
entered	O
in	O
a	O
Unicode-enabled	O
editor	O
without	O
any	O
escaping	O
of	O
characters	O
(	O
like	O
JavaScript	B-Language
,	O
Curl	B-Language
is	O
Unicode	O
friendly	O
)	O
.	O
</s>
<s>
Stanza	O
could	O
be	O
further	O
refined	O
to	O
include	O
a	O
hidden	O
navigation	O
anchor	O
for	O
page	O
navigation	O
using	O
the	O
Curl	B-Language
 { destination } 	O
which	O
is	O
itself	O
a	O
text	O
procedure	O
.	O
</s>
<s>
Curl	B-Language
also	O
permits	O
top-level	O
file	O
inclusion	O
so	O
that	O
a	O
source	O
text	O
in	O
markup	O
can	O
be	O
included	O
in	O
different	O
parent	O
files	O
.	O
</s>
