<s>
Foundation	O
is	O
a	O
free	O
responsive	B-General_Concept
front-end	B-Architecture
framework	O
,	O
providing	O
a	O
responsive	B-General_Concept
grid	O
and	O
HTML	B-Language
and	O
CSS	B-Language
UI	B-Application
components	O
,	O
templates	O
,	O
and	O
code	O
snippets	O
,	O
including	O
typography	O
,	O
forms	O
,	O
buttons	O
,	O
navigation	O
and	O
other	O
interface	O
elements	O
,	O
as	O
well	O
as	O
optional	O
functionality	O
provided	O
by	O
JavaScript	B-Language
extensions	O
.	O
</s>
<s>
Foundation	O
is	O
an	O
open	B-Application
source	I-Application
project	O
,	O
and	O
was	O
formerly	O
maintained	O
by	O
ZURB	O
.	O
</s>
<s>
Foundation	O
emerged	O
as	O
a	O
ZURB	O
project	O
to	O
develop	O
front-end	B-Architecture
code	O
more	O
efficiently	O
.	O
</s>
<s>
In	O
October	O
2011	O
,	O
ZURB	O
released	O
Foundation	O
2.0	O
as	O
open	B-Application
source	I-Application
under	O
the	B-License
MIT	I-License
License	I-License
.	O
</s>
<s>
It	O
is	O
a	O
responsive	B-General_Concept
framework	O
built	O
with	O
Sass/SCSS	B-Language
.	O
</s>
<s>
The	O
framework	O
includes	O
most	O
common	O
patterns	O
needed	O
to	O
prototype	O
a	O
responsive	B-General_Concept
site	I-General_Concept
.	O
</s>
<s>
Since	O
version	O
2.0	O
it	O
also	O
supports	O
responsive	B-General_Concept
design	I-General_Concept
.	O
</s>
<s>
Foundation	O
is	O
open	B-Application
source	I-Application
and	O
available	O
on	O
GitHub	B-Application
.	O
</s>
<s>
Foundation	O
is	O
modular	O
and	O
consists	O
essentially	O
of	O
a	O
series	O
of	O
Sass	B-Language
stylesheets	I-Language
that	O
implement	O
the	O
various	O
components	O
of	O
the	O
toolkit	O
.	O
</s>
<s>
Component	O
stylesheets	O
can	O
be	O
included	O
via	O
Sass	B-Language
or	O
by	O
customizing	O
the	O
initial	O
Foundation	O
download	O
.	O
</s>
<s>
The	O
toolkit	O
is	O
fully	O
responsive	B-General_Concept
to	O
make	O
use	O
of	O
different	O
resolutions	O
and	O
types	O
of	O
devices	O
:	O
mobile	O
phones	O
,	O
portrait	O
and	O
landscape	O
format	O
,	O
tablets	O
and	O
PCs	O
with	O
a	O
low	O
and	O
high	O
resolution	O
(	O
widescreen	O
)	O
.	O
</s>
<s>
Foundation	O
provides	O
a	O
set	O
of	O
stylesheets	O
that	O
provide	O
basic	O
style	O
definitions	O
for	O
all	O
key	O
HTML	B-Language
components	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
regular	O
HTML	B-Language
elements	O
,	O
Foundation	O
contains	O
other	O
commonly	O
used	O
interface	O
elements	O
.	O
</s>
<s>
The	O
JavaScript	B-Language
components	O
of	O
Foundation	O
4	O
were	O
moved	O
from	O
jQuery	B-Language
JavaScript	B-Language
library	O
to	O
Zepto	O
,	O
on	O
a	O
presumption	O
that	O
the	O
physically	O
smaller	O
,	O
but	O
API-compatible	O
alternative	O
to	O
JQuery	B-Language
would	O
prove	O
faster	O
for	O
the	O
user	O
.	O
</s>
<s>
However	O
,	O
Foundation	O
5	O
moved	O
back	O
to	O
the	O
newer	O
release	O
JQuery-2	O
.	O
</s>
<s>
"	O
jQuery	B-Language
2.x	O
has	O
the	O
same	O
API	O
as	O
jQuery	B-Language
1.x	O
,	O
but	O
does	O
not	O
support	O
Internet	O
Explorer	O
6	O
,	O
7	O
,	O
or	O
8.	O
"	O
</s>
<s>
the	O
official	O
ZURB	O
blog	O
explains	O
,	O
and	O
the	O
unsigned	O
writer	O
claims	O
that	O
the	O
switch	O
back	O
was	O
due	O
to	O
issues	O
of	O
compatibility	O
with	O
customized	O
efforts	O
;	O
and	O
that	O
performance	O
was	O
found	O
to	O
be	O
not	O
as	O
good	O
,	O
on	O
use	O
testing	O
with	O
the	O
newer	O
jQuery-2	O
.	O
</s>
<s>
There	O
are	O
three	O
levels	O
of	O
integration	O
for	O
Foundation	O
:	O
CSS	B-Language
,	O
SASS	B-Language
,	O
and	O
Ruby	O
on	O
Rails	O
with	O
the	O
Foundation	O
Rails	O
Gem	O
.	O
</s>
<s>
To	O
use	O
Foundation	O
CSS	B-Language
,	O
default	O
or	O
custom	O
CSS	B-Language
packages	O
can	O
be	O
downloaded	O
from	O
the	O
download	O
page	O
and	O
installed	O
into	O
the	O
appropriate	O
web	O
server	O
folders	O
.	O
</s>
<s>
Foundation	O
is	O
then	O
integrated	O
into	O
HTML	B-Language
page	O
markup	O
.	O
</s>
<s>
The	O
Foundation	O
SASS	B-Language
install	O
uses	O
Ruby	O
,	O
Node.js	B-Language
,	O
and	O
Git	B-Application
to	O
install	O
Foundation	O
sources	O
.	O
</s>
<s>
Foundation	O
then	O
provides	O
a	O
command	O
line	O
interface	O
to	O
modify	O
and	O
compile	O
source	O
to	O
CSS	B-Language
for	O
use	O
in	O
HTML	B-Language
page	O
markup	O
.	O
</s>
