<s>
The	O
Windows	B-Language
Library	I-Language
for	I-Language
JavaScript	I-Language
(	O
abbreviated	O
as	O
WinJS	B-Language
)	O
is	O
an	O
open-source	B-Application
JavaScript	B-Language
library	I-Language
developed	O
by	O
Microsoft	O
.	O
</s>
<s>
It	O
has	O
been	O
designed	O
with	O
the	O
primary	O
goal	O
of	O
easing	O
development	O
of	O
Windows	O
Store	O
apps	O
for	O
Windows	B-Application
8	I-Application
and	O
Windows	B-Operating_System
10	I-Operating_System
,	O
as	O
well	O
as	O
Windows	B-Operating_System
Phone	I-Operating_System
apps	I-Operating_System
for	O
Windows	B-Protocol
Phone	I-Protocol
8.1	I-Protocol
,	O
Windows	B-Operating_System
10	I-Operating_System
Mobile	I-Operating_System
and	O
Xbox	B-Device
One	I-Device
applications	O
using	O
HTML5	B-Application
and	O
JavaScript	B-Language
,	O
as	O
an	O
alternative	O
to	O
using	O
WinRT	B-Language
XAML	I-Language
and	O
C#	B-Application
,	O
VB.NET	B-Language
or	O
C++	B-Language
(	O
CX	B-Language
)	O
.	O
</s>
<s>
WinJS	B-Language
started	O
as	O
a	O
technology	O
that	O
was	O
specific	O
to	O
Windows	O
Store	O
apps	O
,	O
but	O
has	O
evolved	O
to	O
aim	O
at	O
working	O
in	O
any	O
Web	B-Application
browser	I-Application
.	O
</s>
<s>
In	O
April	O
2014	O
,	O
during	O
the	O
Microsoft	B-Application
Build	I-Application
developer	O
conference	O
,	O
WinJS	B-Language
was	O
released	O
under	O
the	O
Apache	B-Application
License	I-Application
as	O
free	B-Application
and	I-Application
open	I-Application
source	I-Application
software	I-Application
to	O
port	O
it	O
to	O
other	O
than	O
Microsoft	O
platforms	O
.	O
</s>
<s>
A	O
site	O
dedicated	O
to	O
demonstrating	O
the	O
library	B-Library
has	O
also	O
been	O
published	O
.	O
</s>
<s>
WinJS	B-Language
provides	O
helpers	O
that	O
facilitate	O
the	O
development	O
of	O
Windows	O
Store	O
apps	O
using	O
HTML5	B-Application
and	O
JavaScript	B-Language
.	O
</s>
<s>
The	O
library	B-Library
consists	O
of	O
modules	O
and	O
functions	O
that	O
expose	O
the	O
Windows	O
Runtime	O
in	O
a	O
way	O
that	O
is	O
consistent	O
with	O
JavaScript	B-Language
coding	O
conventions	O
.	O
</s>
<s>
WinJS	B-Language
makes	O
it	O
possible	O
to	O
add	O
Windows	O
UI	B-Application
controls	O
in	O
HTML	B-Language
.	O
</s>
<s>
This	O
is	O
accompanied	O
by	O
support	O
for	O
data	B-General_Concept
binding	I-General_Concept
and	O
a	O
template	B-Language
engine	I-Language
.	O
</s>
<s>
Other	O
JavaScript	B-Application
frameworks	I-Application
,	O
such	O
as	O
JQuery	B-Language
,	O
can	O
work	O
side-by-side	O
with	O
WinJS	B-Language
.	O
</s>
<s>
The	O
library	B-Library
comes	O
with	O
additional	O
declaration	O
files	O
for	O
a	O
rich	O
developer	O
experience	O
using	O
TypeScript	B-Language
,	O
a	O
strict	O
superset	O
of	O
JavaScript	B-Language
with	O
annotations	O
.	O
</s>
<s>
TypeScript	B-Language
enables	O
for	O
code	O
completion	O
and	O
refactoring	O
while	O
maintaining	O
compatibility	O
with	O
JavaScript	B-Language
.	O
</s>
<s>
UI	B-Application
controls	O
with	O
fundamental	O
support	O
for	O
touch	O
,	O
mouse	O
and	O
keyboard	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
WinJS	B-Language
.	O
</s>
<s>
It	O
was	O
released	O
with	O
Windows	B-Application
8	I-Application
.	O
</s>
<s>
WinJS	B-Language
was	O
released	O
as	O
open-source	B-Application
software	I-Application
under	O
the	O
Apache	B-Application
License	I-Application
on	O
GitHub	B-Application
by	O
popular	O
demand	O
.	O
</s>
<s>
The	O
project	O
aimed	O
at	O
cross-platform	O
and	O
browser	B-Application
compatibility	O
.	O
</s>
<s>
The	O
following	O
distributions	O
are	O
derived	O
from	O
WinJS	B-Language
2.0	O
:	O
</s>
<s>
WinJS	B-Language
3.0	O
was	O
released	O
in	O
September	O
,	O
2014	O
with	O
special	O
focus	O
on	O
:	O
</s>
<s>
A	O
preview	O
of	O
WinJS	B-Language
4.0	O
was	O
announced	O
on	O
March	O
27	O
,	O
2015	O
,	O
and	O
the	O
full	O
release	O
was	O
announced	O
on	O
June	O
8	O
.	O
</s>
